Scientific publications—2017

Year: 2017

Abstract: In this paper, two kinds of artificial magnetic conductors (AMC) are formed in a chessboard to reduce the radar cross section (RCS). Considering a 180+37° phase difference between reflection coefficients of both the AMC unit cells, frequency bandwidth of 55% from 2S.5GHz to 50GHz is obtained. In order to redirect energy and reduce RCS, the AMC structures are configured on chessboard surface. In addition, the influence of the incidence angle in the operating bandwidth of chessboard has been analyzed and compared with theoretical results. Meanwhile, TEz and TMz polarizations for oblique incidence are also investigated. © 2017 URSI.

Source title: 2017 32nd General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2017

DOI : 10.23919/URSIGASS.2017.8105308

Link: Scattering behavior of AMC chessboard for RCS reduction application

Year: 2017

Abstract: In order to reduce the radar cross section (RCS) over a wide frequency range, two new designs are proposed and compared. For the design purposes, frequency-selective surfaces (FSS) have been applied due to their notable electromagnetic characteristics including reflection phase variations with frequency. Three different FSS unit cells are designed including large and small circles and multi-resonance square, to achieve 180+37° reflection phase difference over a wideband frequency range. Two different configurations using combinations of the three cells are examined in terms of the reflection phase difference. Numerical results of proposed designs show that those can cover monostatic RCS reduction of 44% and 51.4%, respectively. © 2017 URSI.

Source title: 2017 32nd General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2017

DOI : 10.23919/URSIGASS.2017.8105307

Link: Wideband RCS suppression based on FSS structures for millimeter applications

Year: 2017

Abstract: Advanced Television Systems Committee (ATSC) 3.0, which is the new international standard for next generation broadcasting, allows to deliver multiple services with different reception conditions in a single RF channel. In the physical layer standard of ATSC 3.0, two kind of multiplexing schemes are adopted: Orthogonal schemes including traditional time division multiplexing (TDM) and frequency division multiplexing (FDM), and a newly introduced non-orthogonal scheme, named layered division multiplexing (LDM). In this paper, we consider two services configured by LDM and TDM based on the ATSC 3.0 standard. Field test results which evaluate the mobile performance of LDM and TDM are provided. © 2017 IEEE.

Source title: IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB

DOI : 10.1109/BMSB.2017.7986180

Link: Mobile field comparison test of LDM and TDM based on ATSC 3.0

Year: 2017

Abstract: This paper presents several prototype antenna elements and arrays developed at the Communications Research Centre for potential use in broadband communication applications. Various configurations of dielectric resonator antennas and dielectric lens antennas are examined as well as reflectarray technology and advanced architectures for low-profile phased arrays. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861753

Link: Antenna research and development for broadband communications at the communications research centre

Year: 2017

Abstract: Due to the frequency dependence of phasing mechanisms applied in planar printed reflectors, such antennas are prone to beam squint as the frequency is scanned within the operating band. A novel technique is introduced in this paper to cancel the beam squint due to frequency sweep. Another reflector is used to cancel the beam squint within the operating band. The results are compared with the beam squint of a conventional planar reflector in order to demonstrate the effectiveness of the suggested technique. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861770

Link: A novel technique for beam squint cancellation in planar reflectors

Year: 2017

Abstract: A large-signal design procedure along with simulated and measured results for two Ka-band MMIC voltage-controlled oscillators (VCOs) are described. These circuits were built for deployment in 28GHz local multipoint distribution (or communication) systems (LMDS or LMCS) and 38GHz communication applications. They were designed for optimum phase-noise and spurious performance. The VCO for the 38GHz mobile communication systems was fabricated using a hetero-junction bipolar transistor (HBT) process. It provides an output power of 0dBm at 40.5GHz with a 200MHz tuning range and has a free-running phase-noise of-83dBc/Hz at 100kHz offset. The VCO for the 28GHz LMDS/LMCS application was fabricated using a high-electron mobility transistor (HEMT) process. It oscillates at 29GHz, with a tuning range of 700MHz and buffered output power in excess of 20dBm, and has a free-running phase-noise of-62dBc/Hz at 100kHz offset. Once phase-locked using a 10MHz reference signal, the 29GHz VCO exhibits an improved phase-noise of-70dBc/Hz at 100kHz offset from the carrier. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861695

Link: The design and analysis of Ka-band MMIC voltage-controlled oscillators

Year: 2017

Abstract: This paper presents the development and the use of a FORTRAN program that was added to a NEC-81 version of the well known NEC-2 program for the purpose of computing field strength contours. Whereas a field radiation pattern identifies the field variation for a constant observation distance about the antenna, a field strength contour identifies the distance variation for a constant field strength (|Ez| here). Because field strength contours are meaningful in the near-field as well as the far-field zones, they are useful in providing a picture of the emission process everywhere about the antenna. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861762

Link: The addition of a field strength contour capability to NEC-2 and its application to the field emitted by an AM radio broadcast array

Year: 2017

Abstract: Microstrip antennas are widely used in various applications from L-Band to EHF. Many of these applications, such as mobile satcom, require circular polarized (CP) antennas with wideband performance. The simplest designs for CP microstrip antennas involve a single point feed and a slight perturbation in the antenna structure. This results in a CP antenna with a narrow bandwidth and an average axial ratio (AR) performance. Wider bandwidth can be achieved by using a thicker and lower permittivity substrate with air being the best. Better AR can be obtained by using two point feeds where they are located spatially 90 degrees apart and are excited in phase quadrature with equal amplitude. For these thicker substrate antennas, however, there may be significant amount of coupling between the two feeds which will degrade the AR performance of the CP antennas. This paper will present the investigation of the effects of inter-feed coupling on the AR performance and will examine methods for minimizing the coupling for the optimum CP operation. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861724

Link: Effects of inter-feed coupling on the axial ratio performance of circular polarized microstrip antennas

Year: 2017

Abstract: The design of a subharmonically pumped (SHP), monolithic microwave integrated circuit (MMIC) mixer for future wireless communications applications is described. The mixer uses an anti-parallel diode pair to achieve frequency translation by mixing the RF signal with the second harmonic of the fundamental LO pump. The circuit was fabricated by Triquint Semiconductor Inc. using their GaAs MMIC PHEMT process. The overall chip size is 1.2 mm × 1.3 mm. Measured conversion loss is 13 dB with a 61 GHz RF input signal and RF port return loss is better than 10 dB over a 61.4 to 62.5 GHz frequency range. Simulation predicts a conversion loss of 13 dB over 59 to 61 GHz band and an RF port return loss of better than 10 dB over this range. The simulated 1-dB compression point occurs with an RF input power level of 5 dBm. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861792

Link: Design of a 60 GHz subharmonic mixer MMIC

Year: 2017

Abstract: In this paper, the cut-off frequency of the dominant mode of a finned waveguide is computed using the Symmetric Condensed Node Transmission Line Matrix (SCN-TLM) and Finite Volume Time Domain (FVTD) methods. The cut-off frequencies are computed for various sizes of fins as well as fine and coarse meshes. The values of the cut-off frequencies are obtained and compared with each other and with a benchmark solution. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861774

Link: Evaluation of the FVTD technique for electromagnetic field problems containing highly inhomogeneous structures

Year: 2017

Abstract: Lattice gas automata (LGA) are an alternative to the traditional differential equation based numerical methods now widely used in computational electromagnetics[1]. Lattice gas automata are based on studying the behaviour of an extremely large array of simple cells. The states of the cells are very simple, usually consisting of only a few bits per cell. A lattice gas is a microscopic description of physics of the problem being modelling, where the bits in the cell can be envisioned as particles which are intended to mimic the interaction of particles on the lattice. The LGA evolves in discrete time steps, where all cells in the lattice are updated in synchronism according to the sample simple rule. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861800

Link: A 3D vector LGA model for computational electromagnetics

Year: 2017

Abstract: This paper examines the principal plane radiation patterns of a portable radio handset at 850 MHz operating near a model of the human head. The handset and head are solved by the finite-difference time-domain method. To validate the computed patterns, they are compared with measured radiation patterns, with excellent agreement for the handset alone and very good agreement for both the handset near the box model of the head, and the handset near the sphere head model. FDTD is then used to find the principal plane patterns of the handset near a realistic model of the head based on anatomical cross-sections. The principal plane patterns of the handset and anatomical head are shown to be very similar to those of the handset near a sphere of size comparable to the head. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861788

Link: Portable radio handset patterns in the presence of a model of the head

Year: 2017

Abstract: Recent progress made toward the development of ultra-high-speed, wide-band, electro-optic modulators, fabricated in compound semiconductors, is described. Specifically, integrated-optic polarization converters, a typical application being TE = TM mode conversion, which can be fabricated in compound semiconductors are discussed. These devices use slow-wave, coplanar strip electrodes to achieve the velocity-match condition between a modulating microwave signal and a modulated optical signal. The paper describes the slow-wave electrodes and the theory of operation, the design, and the fabrication of the integrated-optic polarization converters that use them. Electrical measurements for the slow-wave electrodes showing them to be low-loss, below 0.4 Np/cm, and to be able to meet the velocity-match condition, having effective indices  3.4, have been made for frequencies up to 40 GHz. Also, optical measurements for the polarization converters showing no appreciable drop in optical modulation have been made for frequencies up to 20 GHz. Finally, design improvements that will aid in the development of such devices having low drive power requirements and optical bandwidths above 100 GHz are discussed. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861725

Link: Ultra-high-speed compound semiconductor polarization/mode converter using slow-wave coplanar electrodes

Year: 2017

Abstract: In this paper the application of the symmetric condensed node transmission line matrix method (SCN TLM) to three dimensional scattering from biological tissue is investigated. Using a simplified model of the human head and assuming a nondispersive nature of biological tissue, the stub-loaded SCN TLM method is used to obtain scattered and transmitted fields data and the SAR distribution. To simulate the dispersive nature of biological tissue, first order Debye approximation of the permittivity in the frequency domain is used. A modified TLM technique is used. In this technique the scattering matrix is independent of the dielectric properties of the medium, which are accounted for via lumped equivalent networks or sources connected to the nodes. These equivalent sources are calculated at each time step and included in the scattering procedure of the TLM. The results of both cases are compared. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861696

Link: Scattering from biological tissue using the SCN transmission line matrix method

Year: 2017

Abstract: In this paper, a method for obtaining the generalized scattering matrix coefficients of both the propagating and evanescent modes of waveguide discontinuities is presented. The method is based on the modal expansion of field distributions obtained from Transmission Line Matrix (TLM) simulations and use of the orthogonality principle to quantify the presence of specific modes. Using this approach, the coefficients have been evaluated close to discontinuities in the presence of higher order propagating as well as evanescent modes. This simple and rigorous approach enables us to characterize a discontinuity with reduced computational effort. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861706

Link: Extraction of generalized scattering matrix coefficients of waveguide discontinuities using the TLM method

Year: 2017

Abstract: Work in progress on a propagation simulator is described. This simulator is being written for the purpose of predicting coverage for LMCS/LMDS systems in suburban environments. Preliminary coverage predictions are given based on a randomly generated environment database. These predictions suggest the relative importance of various factors in determining coverage, including the use of specular reflections, the effect of rain, and the effect of system design choices such as power margin, the use of cell overlap and on-channel repeaters. The ongoing verification of the simulator using experimental power measurements is summarized, as well as resulting changes made to the simulator to date. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861693

Link: Propagation simulation for the prediction of LMCS/LMDS coverage

Year: 2017

Abstract: This paper describes the research and development of a cavity-structure-based 30 GHz transmitting antenna for a portable satellite communication terminal, with focus on minimizing grating lobe levels in far-field amplitude radiation patterns. A hexagonal array architecture was found to offer the best performance in terms of grating lobe level suppression. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861738

Link: Investigation of active array geometries to optimize performance for 30 GHz portable satellite communications terminals

Year: 2017

Abstract: This paper reports work in progress on the analysis of radio propagation data measured at 28.5 GHz and 29.5 GHz in a suburban-type residential area in Ottawa. Both CW and wideband measurements were made in several radio propagation surveys. Issues discussed include: propagation loss in cluttered environments; cumulative probability distributions (CDFs) for excess loss; cross polarisation isolation, and temporal dispersion caused by multipath propagation. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861680

Link: Radio propagation data pertinent to the design of LMCS systems at 28 GHz

Year: 2017

Abstract: TLM simulations and experimental investigations are carried out at 13-15 GHz using parasitically coupled rectangular dielectric resonator antenna elements. Several configurations are examined with the results being increased bandwidth, dual frequency operation and manipulated radiation pattern characteristics. Close agreement is obtained between measurement and simulation. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861714

Link: TLM simulations of parasitic coupling in rectangular dielectric resonator antennas

Year: 2017

Abstract: Lattice Gas Automata (LGA) can be considered as an alternative to the conventional differential equation description of problems in electromagnetics. LGAs are discrete dynamical systems that are based on a microscopic model of the physics being simulated. The basic constituents of an LGA are discrete cells. These cells are interconnected according to certain symmetric requirements to form an extremely large regular lattice. The cells of an LGA are extremely simple, requiring only a few bits to completely describe their states. Even through they are simple however, the collective behaviour of LGA microscopic systems are capable of exhibiting those behaviours described by partial differential equations for real physical systems. One type of simple LGA, the HPP LGA, is constructed with only a few bits per cell and operated on a rectangular lattice. We have demonstrated [1] that it is capable of simulating two dimensional electromagnetic fields. Furthermore, the inherent parallelism and simplicity of LGA algorithms make them ideally suited to implementation in a parallel processing architecture. © 1998 IEEE.

Source title: Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1998 — Conference Proceedings

DOI : 10.1109/ANTEM.1998.7861801

Link: Computing electromagnetic fields in inhomogeneous media using lattice Gas Automata

Year: 2017

Abstract: A novel printed quasi-Yagi antenna with dual stubs loaded on a parasitic strip director has been presented. The impedance bandwidth is analyzed and compared when we add or eliminate the parasitic strip director. Then, two open stubs are loaded on the strip to excite an additional resonant mode, which lead to a wider impedance bandwidth. To demonstrate the effectiveness of this design, an antenna prototype is fabricated and tested. Experimental results show that the antenna provides a bandwidth ranging from 4.4 to 9.3 GHz and within the whole band larger than 4.1 dBi gain is achieved. Additionally, the proposed antenna presents a stable end-fire radiation directivity and low cross-polarization level at different frequencies with a compact structural size of 35 mm × 26 mm. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:447–451, 2017. © 2016 Wiley Periodicals, Inc.

Source title: Microwave and Optical Technology Letters

DOI : 10.1002/mop.30298

Link: A printed quasi-Yagi antenna with dual-stub-loaded parasitic strip director for bandwidth enhancement

Year: 2017

Abstract: Parity-time (PT) symmetric structures present the unidirectional invisibility at the spontaneous PT-symmetry breaking point. In this paper, we propose a PT-symmetric circuit consisting of a resistor and a microwave tunnel diode (TD) which represent the attenuation and amplification, respectively. Based on the scattering matrix method, the circuit can exhibit an ideal unidirectional performance at the spontaneous PT-symmetry breaking point by tuning the transmission lines between the lumped elements. Additionally, the resistance of the reactance component can alter the bandwidth of the unidirectional invisibility flexibly. Furthermore, the electromagnetic simulation for the proposed circuit validates the unidirectional invisibility and the synchronization with the input energy well. Our work not only provides an unidirectional invisible circuit based on PT-symmetry, but also proposes a potential solution for the extremely selective filter or cloaking applications. © 2017 The Author(s).

Source title: Scientific Reports

DOI : 10.1038/srep40575

Link: Unidirectional invisibility induced by parity-time symmetric circuit

Year: 2017

Abstract: Forward error correction (FEC) plays an important role in modern wireless networks to protect video transmission from errors. For example, low-density parity-check (LDPC) codes, a class of popular FEC option, have been widely adopted by the most advanced wireless communication systems, including IEEE 802.16e, 802.11n, and DVB-S2/T2 [1-3]. To improve the bit error rate (BER) performance, this chapter develops a novel multilayer LDPC iterative decoding scheme using deterministic bits for multimedia communication. These bits serve as deterministic information in the LDPC decoding process to reduce the redundancy during video transmission. Unlike the existing work, our proposed scheme addresses the deterministic bits that can be repositioned, such as moving picture experts group (MPEG) null packets and service information (SI) bits, rather than the widely investigated protocol headers. Simulation results show that our proposed scheme can achieve considerable gain in today's most popular broadband wireless multimedia networks, such as WiMAX and WiFi. © 2013 by Taylor & Francis Group, LLC.

Source title: Advanced Video Communications over Wireless Networks

DOI : 10.1201/b13746

Link: Multilayer iterative FEC decoding for video transmission over wireless networks

Year: 2017

Abstract: This paper proposes a robust option for developing a new class of efficient and cheap antenna array based on patch array fed by substrate-integrated waveguide (SIW) through slot apertures for wireless backhauling applications. It consists in performing the feed network in SIW and the radiating structure in microstrip technology. The microstrip lines are coupled to the slots on the top wall of the SIW. Hence, it is demonstrated that the best alternative of the costly, heavy, and bulky rectangular waveguide feeder is SIW, which provides miniaturization, cost reductions, performance enhancements, and easy integration with patch array antennas. The experimental prototype presented in this paper demonstrates the efficiency of the design method and the feasibility of creating low-cost moderate-bandwidth millimeter-wave planar 8× 8 patch antenna array configurations in two stacked substrates to get ultracompact antenna module. The principle of achieving such high-quality antenna array is presented in detail along with experimental verification of theoretical results to validate the design procedure and demonstration of the feasibility of implementing the array by means of relatively inexpensive compact structures. The maximum gain is around 23 dBi at 22.4 GHz, the measured impedance bandwidth is 5%, and the efficiency is around 70%. © 2011-2012 IEEE.

Source title: IEEE Transactions on Components, Packaging and Manufacturing Technology

DOI : 10.1109/TCPMT.2017.2706089

Link: A Novel Two-Layer Low-Profile 23-GHz Microstrip Array Fed by Slots in an SIW for Wireless Backhauling Applications

Year: 2017

Abstract: In this paper, we present an efficient transmission method of multiple broadcasting services using layered division multiplexing (LDM) and scalable high efficiency video coding (SHVC) based on the next generation terrestrial digital broadcasting standard, advanced television systems committee 3.0. In a two-layer LDM system, each layer forms a physical layer pipe that carries base layer and enhancement layer video streams of SHVC, respectively. This combination of physical and presentation layers technologies can maximize channel utilization when multiple broadcasting services are delivered in a single radio frequency channel with different robustness and reception conditions. An intensive performance analysis is provided when the proposed combination of LDM and SHVC is compared with other approaches, such as time division multiplexing and/or high efficiency video coding simulcast broadcasting. Several performance measurements are also introduced, such as constant data rate measurement and constant quality measurement, which are used to evaluate the performance of video codecs in conjunction with different physical layer system parameters. A prototype hardware system with LDM and SHVC capable of selecting different parameter combinations is tested in the laboratory and in real field environments to verify the performance and feasibility of the proposed LDM and SHVC combination. Results show that the proposed LDM and SHVC combination provides significant gains on video service quality as well as reception robustness. IEEE

Source title: IEEE Transactions on Broadcasting

DOI : 10.1109/TBC.2017.2755264

Link: Efficient Transmission of Multiple Broadcasting Services Using LDM and SHVC

Year: 2017

Abstract: A framework for frequency adaptation is proposed to enable networks that coexist in uncoordinated spectrum bands to gradually change their operating frequencies to attain interference-tolerant conditions. It is shown that incorporating channel conditions and cross-layer information in making frequency adaptation decisions significantly increases spectrum utilization efficiency and reduces access delay.

Source title: IEEE Wireless Communications Letters

Series Number: vol 6, Issue 3

DOI : 10.1109/LWC.2017.2671421

Link: Graceful Frequency Adaptation for Networks Coexisting in Uncoordinated Spectrum Bands

Year: 2017

Abstract: This paper investigates the application of 5G wireless multicast to the big data system. In particular, we propose a hybrid unicast/multicast transmission scheme using 3D massive multi-input multi-output (MIMO) technique. The proposed scheme employs multicast beamforming in the multicast group and multi-user MIMO (MU-MIMO) linear precoding in the unicast group. It also applies the null space based interference cancellation to eliminate the signal leakage generated by other groups. Simulation results show that the proposed system can significantly improve the system throughput with an antenna array configuration, precoding/beamforming schemes and user grouping strategies. © 2017 IEEE.

Source title: IEEE International Conference on Communications

DOI : 10.1109/ICC.2017.7996723

Link: High-Performance Multicast Services in 5G Big Data Network with Massive MIMO

Year: 2017

Abstract: The geolocation of GPS Jammers is a problem that has not been solved. Technically there are solutions that are expensive and not effective. This work demonstrates an effective low—cost near—real time detection and location solution.

Source title: INSIDE GNSS MAGAZINE

Series Number: Vol 12, Issue 1

Link: Is it Possible to Build a Low-Ccost System to Detect and Locate a Single GNSS Jammer in Near-Real Time?

Year: 2017

Abstract: Future media transmission as a consistent target is pursued by both next mobile communication system (5G) and advanced digital terrestrial television system. High data rate and flexibility are major considerations for future media transmission. Broadcasting network facilitates high-efficiency transmission of popular or live video in large area, and while, cellular network tends to provide personalized and localized services with a unicast/multicast model. The broadcast-like scheme emerges in 5G to resolve the high demand for bandwidth. However, it requires high deployment cost and imposes much interference on unicast/multicast services. In this paper, a cooperative structure of cellular network and broadcasting network using cloud radio access network (C-RAN) is proposed. The expenses of constructing hybrid network can be significantly cut down by applying the centralization and virtualization of C-RAN. Besides, technical approaches for 3GPP and ATSC cooperation in physical layer is detailed. Dedicated return channel (DRC) of broadcasting network is proposed to enable seamless interaction between broadcasters and few users in a remote area with high expense of cellular tower deployment. To loosen the real-time physical layer pipes period restriction of DRC system, three alternative periods are investigated to provide more flexibility to broadcasters. 2017 IEEE.

Source title: IEEE Transactions on Broadcasting

DOI : 10.1109/TBC.2017.2722231

Link: Media Transmission by Cooperation of Cellular Network and Broadcasting Network

Year: 2017

Abstract: Quick Response (QR) code is a two-dimensional bar-code, which is quite popular due to its excellent storage capacity and error resilience. Generally, QR codes are widely used to store text information such as URL links, geographical coordinates, name cards, inventory information, authorship, etc. To reach the current limit of QR codes, in this paper, we would like to propose an innovative multimedia archiving technique, which is built upon the advanced signal processing scheme to tackle the multiple QR codes all at once. The multimedia data often include texts, images, audio data, special-purpose codes, etc. The recently proposed software-defined multiplexing code (SDMC) can be applied to combine all of them even though each type of data would have the individual data format different from others. Our proposed new archiving technique involves two phases, namely multimedia-amalgamation (MA) and multimedia-detachment (MD). In the MA phase, the multimedia data, regardless of their data format, can be converted to the binary streams; then the SDMC will be employed to aggregate them together in a longer binary stream; such an ultimate long binary stream will be converted to the QR codes. The QR codes, protected by the inherent error-correction mechanism, will thus be placed on a sheet or multiple sheets with a uniform spacing. The sheet(s) containing multiple QR codes can thus be archived in soft (PDF) or hard (print-out) copies. In the MD (recovery) phase, one can scan these PDF files and employ our designed signal processing algorithms to separate the individual QR codes; then the corresponding QR decoder can convert these QR codes back to the original binary stream. Finally the unstuffing algorithm in the SDMC can detach the individual data from the long binary stream composed by the multimedia mixture. © 2017 IEEE.

Source title: IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB

DOI : 10.1109/BMSB.2017.7986236

Link: New Multimedia Archiving Technique Using Multiple Quick-Response Codes

Year: 2017

Abstract: The electronic media, such as digital magazines and newspapers, are becoming more and more popular nowadays. The computer-aided information retrieval of such electronic documents is crucial for any further data-mining applications. In this paper, we proposed a novel electronic scissoring algorithm to automatically extract the image content from an arbitrary electronic document. Our proposed new algorithm contains two steps, namely the information-content extraction and the image-content detection. In the first step, everything other than the background is extracted using a computationally-efficient variance filter. The information content usually consists of text, image, and delimiters. The next step, the entropy measure is employed to distinguish the images from other content. Experiments are carried out using data captured from random web-pages. The receiver-operating characteristic curves have been presented to demonstrate the effectiveness of our proposed new algorithm. © 2017 IEEE.

Source title: IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB

DOI : 10.1109/BMSB.2017.7986126

Link: Novel Electronic Scissoring Algorithm

Year: 2017

Abstract: The default mechanism for a wireless station to select which access point (AP) to associate with is based on the strength of the received signal by the station. This leads to stations associating to the closest AP. In situations where user stations are concentrated around one AP, the default algorithm (DA) results in an unbalanced distribution of station-AP associations. This causes congestion at the AP with many associated stations, which degrades the network throughput. We propose a novel association algorithm called Time-Load Algorithm (TLA) that associates stations to an AP based on the time-loading of that AP as well as its signal strength. We evaluate the performance of our TLA in comparison with the DA in different scenarios based on network throughput and packet delivery ratio. The simulation results clearly indicate that the TLA outperforms the DA in all scenarios alleviating highly loaded APs and improving throughput experience. © 2017 IEEE.

Source title: 2017 26th International Conference on Computer Communications and Networks, ICCCN 2017

DOI : 10.1109/ICCCN.2017.8038500

Link: User Association Algorithm for Throughput Improvement in High-Density Wireless Networks

Year: 2017

Abstract: In this paper, an X-band electronically steerable parasitic array radiator (ESPAR) of circularly polarized dielectric resonator antennas (CP-DRAs) is proposed. The array consists of one driven CPDRA coupled to four parasitic CP-DRAs. The parasitic elements are placed adopting a sequential rotation approach and are terminated by tunable varactors to steer the beam into the desired direction. The proposed CP-ESPAR technique eliminates the need of expensive phase shifters, which significantly reduces cost and fabrication complexity. For performance evaluation, a prototype of the proposed antenna is designed, fabricated, and measured. It is observed that the proposed antenna has a monotonic CP beam scanning from 22° to 22°; operating at 10.5 GHz. In addition, the peak value of the realized gain is 6.6 dBic with 0.9 dB variation within the entire scanning range. IEEE

Source title: IEEE Transactions on Antennas and Propagation

DOI : 10.1109/TAP.2017.2780895

Link: X-Band Circularly Polarized Electronically Steerable Parasitic Array Radiator of DRA

Year: 2017

Abstract: A silver molecular ink platform formulated for screen, inkjet, and aerosol jet printing is presented. A simple formulation comprising silver neodecanoate, ethyl cellulose, and solvent provides improved performance versus that of established inks, yet with improved economics. Thin, screen-printed traces with exceptional electrical (<10 m//mil or 12 ·cm) and mechanical properties are achieved following thermal or photonic sintering, the latter having never been demonstrated for silver-salt-based inks. Low surface roughness, submicron thicknesses, and line widths as narrow as 41 m outperform commercial ink benchmarks based on flakes or nanoparticles. These traces are mechanically robust to flexing and creasing (less than 10% change in resistance) and bind strongly to epoxy-based adhesives. Thin traces are remarkably conformal, enabling fully printed metal-insulator-metal band-pass filters. The versatility of the molecular ink platform enables an aerosol jet-compatible ink that yields conductive features on glass with 2× bulk resistivity and strong adhesion to various plastic substrates. An inkjet formulation is also used to print top source/drain contacts and demonstrate printed high-mobility thin film transistors (TFTs) based on semiconducting single-walled carbon nanotubes. TFTs with mobility values of 25 cm² V^-1 s^-1 and current on/off ratios >10⁴ were obtained, performance similar to that of evaporated metal contacts in analogous devices. © 2017 American Chemical Society.

Source title: ACS Applied Materials and Interfaces

DOI : 10.1021/acsami.7b02573

Link: Versatile Molecular Silver Ink Platform for Printed Flexible Electronics

Year: 2017

Abstract: 802.11 (Wi-Fi) networks are widely deployed, providing access to a huge number of users using the unlicensed spectrum. Wi-Fi users have different bandwidth capabilities based on location, interference and application requirements. Given the way Wi-Fi accesses the wireless spectrum, tests in our lab and reports in the literature showed that low bandwidth Wi-Fi users take a big portion of the air time, hindering the performance of high bandwidth users. Some vendors address this with proprietary solutions that requires special drivers and chipsets. In this paper, we design and implement a portable solution that runs on any Wi-Fi device and doesn't require modifications to the hardware or the standard protocols. We propose different air time allocation strategies exploiting the Hierarchical Token Bucket (HTB) bandwidth management capability found in any Linux distribution. Weights and air quotas are calculated for different users based on a traffic shaping strategy. Compared to normal Wi-Fi access, tests showed that the proposed solution enables a flexible control of air time allocation to contending users without the need for proprietary drivers. Moreover, the results demonstrated an improvement of the throughput ratio and stability for most of the users, hence, making better use of the unlicensed spectrum. © 2017 IEEE.

Source title: 2017 IEEE Wireless Communications and Networking Conference Workshops, WCNCW 2017

DOI : 10.1109/WCNCW.2017.7919116

Link: A Practical Air Time Control Strategy for Wi-Fi in Diverse Environment

Year: 2017

Abstract: Cognitive Radio (CR) technology offers a promising solution to the spectrum scarcity problem via Dynamic Spectrum Allocation (DSA). Due to the nature of Cognitive Radio Networks (CRNs), where two networks are active simultaneously, a significant amount of control messaging is required in order to coordinate channel access, schedule sensing, and establish release connections. Efficient Control Plane messaging can be achieved by the selection of an appropriate Control Channel (CC). This paper gives a comparative study of potential techniques for providing reliable channels dedicated to the coordination and information distribution in License-Exempt (LE) bands. This involves determining the potential and limitations of each technique. © 2017 IEEE.

Source title: 2017 International Conference on Computing, Networking and Communications

DOI : 10.1109/ICCNC.2017.7876226

Link: Performance Study of Dedicated in-band Control Channels for Cognitive Radio Networks

Year: 2017

Abstract: The evolved multimedia broadcast multicast service (eMBMS) system was developed to achieve higher spectrum efficiency on video traffic delivery over the long term evolution (LTE) networks. As an integrated component of the LTE, eMBMS can be deployed with great flexibility using the existing LTE infrastructure. However, the current eMBMS was designed as a supplementary subsystem, and has limited capability to deliver high-quality broadcast-type video services in a spectrum efficient manner. This paper first studies the capability and limitations of the current LTE eMBMS system to deliver broadcast services when deployed as single-frequency-network (SFN). Next, potential physical-layer enhancements are investigated for future eMBMS systems to achieve enhanced broadcast service delivery capability, higher spectrum efficiency, improved service quality, and more efficient SFN deployment options. These include wideband transmission, non-orthogonal multiplexing, e.g., layered-division-multiplexing technology, and more flexible orthogonal frequency division multiplexing system configurations, such as longer cyclic prefix and smaller subcarrier spacing. Other technologies defined in the latest next generation digital television system are also discussed that might be applicable to the development of a more capable standalone future eMBMS system. © 1963-12012 IEEE.

Source title: IEEE Transactions on Broadcasting

Series Number: Volume 63 Issue 1

DOI : 10.1109/TBC.2016.2630269

Link: Improving LTE {e} MBMS with Extended OFDM Parameters and Layered-division-Multiplexing

Year: 2017

Abstract: Layered division multiplexing (LDM) is a spectrum efficient non-orthogonal multiplexing technology that has been adopted in the Advanced Television Systems Committee (ATSC) 3.0 Physical Layer Standard as a baseline technology. This paper studies a two-layer LDM with one layer used for providing a global service through a single frequency network (SFN), and the other for providing local coverage/services, such as location targeted advertising or local content insertion. The pilot boosting effect on SNR and co-channel interference is also analyzed. The LDM upper layer can be used to deliver time-division multiplexed mobile-HD and 4k-UHD services. The LDM lower layer with a negative SNR threshold can reliably provide seamless local coverage/service from each SFN transmitter without coverage gaps among adjacent SFN transmitter service areas. No directional receiving antenna is required for the local service reception and receivers simply tune into the stronger signal. In such LDM systems, while the upper layer is operating in a traditional SFN mode, the lower layer operates in a special form of distributed MIMO or gap-filler mode to provide targeted local coverage. For implementing the two-layer system introduced in this paper, only ATSC 3.0 baseline technologies are used, i.e., there is no need to modify the ATSC 3.0 standard. Given the upper and lower layers' data rate requirements and the SNR thresholds, the lower layer power, with respect to the upper layer (injection level), can be optimized to maximize upper and lower layer performance and coverage. Since the advertisement time of the local service is typically less than 20% of the program time, nonreal time could be used to play-back the local content at five times the transmission bit rate for better (audio/video) service quality. © 1963-12012 IEEE.

Source title: IEEE Transactions on Broadcasting

Series Number: Volume 63 Issue 1

DOI : 10.1109/TBC.2016.2630302

Link: Using LDM to Achieve Seamless Local Service Insertion and Local Program Coverage in SFN Environment

Year: 2017

Abstract: In the ATSC 3.0 PHY layer standard, a transmitter identification (TxID) signal is defined in order to provide the identification of an ATSC 3.0 transmitter. TxID signal can also be used to find the co-channel and adjacent interference signals, to assist accurate location finding calculation, and to obtain the channel estimation for each transmitter, which can help local service (e.g., targeted advertisement) reception, as well as for emergency alert. For efficient use of spectrum and quality of service improvement, single frequency network (SFN) where all transmitters share a single RF channel is often implemented. The recently developed ATSC 3.0 physical layer standard has been designed to support SFN. For efficient designing, fine-tuning and operating an SFN, it is crucial to identify each transmitter, as well as to adjust transmitting power and emission time of each transmitter. This paper presents TxID for ATSC 3.0, and analyzes its detection performance under very low signal to noise ratio environments and other applications, such as location finding, and channel estimation etc. for each SFN transmitter. © 1963-12012 IEEE.

Source title: IEEE Transactions on Broadcasting

DOI : 10.1109/TBC.2016.2630268

Link: ATSC 3.0 Transmitter Identification Signals and Applications

Year: 2017

Abstract: In this paper, we present multiple service configurations based on layered division multiplexing (LDM), which is adopted as a baseline technology of the Advanced Television Systems Committee 3.0 standard. Based on a two-layer LDM technology, a variety of multiple-physical layer pipe (PLP) configurations as well as physical layer framing is introduced depending on the choices of service scenario, time interleaving, and cell addressing. A performance analysis is provided when three different broadcasting services - robust audio, indoor/mobile, and high data rate services - are delivered through different PLPs when a number of broadcasting service scenarios is presented. © 1963-12012 IEEE.

Source title: IEEE Transactions on Broadcasting

Series Number: Volume 63 Issue 1

DOI : 10.1109/TBC.2016.2590824

Link: Multiple Service Configurations Based on Layered Division Multiplexing

Year: 2017

Abstract: This paper proposes a multipath routing optimization algorithm for allocating bandwidth resources to nodes that are subject to interference from flows in other parts of the network. The algorithm consists of three steps: path discovery, path selection and load distribution. In addition to delay, power and hop count, the routing metric also takes into account the interference of flows from other parts of the network during path selection and load distribution. An optimization model is formulated based on the flow cost and the bandwidth usage by the other flows. The AIMMS package is used to solve the optimization problem to obtain an optimal solution with the minimum total flow cost. Finally, we use computer simulations to assess the performance and effectiveness of the proposed routing technique.

Source title: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST

DOI : 10.1007/978-3-319-51204-4_21

Link: Multipath Routing Optimization with Interference Consideration in Wireless Ad hoc Network

Year: 2017

Abstract: Scalability and flexibility are widely considered as two major design goals for 5G networks. Aiming at these goals, this article first identifies a promising architecture based on the heterogeneous cloud radio access network (H-CRAN), reviews the challenges in MIMO precoding for H-CRAN, and then proposes a scalable and flexible massive MIMO precoding scheme by exploiting the null-space of user signals. Specifically, the system can accomplish effective radio resource management and flexible spatial coordination by distinguishing the intended and victim users' CSI, and avoid the interference by precoding within the null-space for the CSI of victim users. Simulation results indicate that the proposed scheme is capable to effectively alleviate the interference to victim users and support high QoS as well as spectral efficiency. © 2002-2012 IEEE.

Source title: IEEE Wireless Communications

Series Number: Volume 24 Issue 1

DOI : 10.1109/MWC.2017.1600139WC

Link: Scalable and Flexible Massive MIMO Precoding for 5G H-CRAN

Year: 2017

Abstract: In this paper, we investigate relative localization techniques based on internode distance measurements for small wireless networks. High precision ranging is assumed, which is achieved by using technologies such as ultra-wide band (UWB) ranging. A number of approaches are formulated and compared for relative location estimation, which include the Linear Least Squares (LLS) approach, the Maximum Likelihood Estimation (MLE) approach, the Map Registration Approach (MAP), the Multidimensional Scaling (MDS) approach and the enhanced MDS approaches. Finally, computer simulations are used to compare the performances and effectiveness of these techniques, and conclusions are drawn on the suitability of the relative localization techniques for small networks. © ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2017.

Source title: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST

Series Number: Volume 184

DOI : 10.1007/978-3-319-51204-4_2

Link: Relative Localization for Small Wireless Sensor Networks

Year: 2017

Abstract: This paper presents a novel electromagnetic bandgap (EBG) structure composed of stacked U-shaped 3-D lattice of metallic open square rings and its potential application to selected waveguide configurations. Five key geometrical parameters are shown to impact the bandgap and modal structure of the EBG. Using this insight, we demonstrate two different configurations for line defect that realize guiding through the structure at Ku-band. The proposed EBG structure overcomes the fabrication complexity of conventional 2-D EBGs that are composed of dielectric rods or holes in a dielectric material. Selected EBG waveguide configurations with transitions to conventional microwave guiding structures are fabricated and tested. © 2016 IEEE.

Source title: IEEE Transactions on Components, Packaging and Manufacturing Technology

DOI : 10.1109/TCPMT.2016.2629852

Link: A Novel Multilayer Electromagnetic Bandgap Structure Composed of Square Rings as Microwave Guiding Structures

Year: 2017

Abstract: [No abstract available]

Source title: Mobile Networks and Applications

DOI : 10.1007/s11036-017-0837-6

Link: Editorial: Ad Hoc Networking and Emerging Applications

Year: 2017

Abstract: LTE/LTE-A networks have become widely exploited to address the increasing demands of mobile traffic. Relay technologies have recently been introduced to fulfill such requirements. Currently, the LTE-A relay standard is restricted to two-hop relaying. This architecture minimizes system complexity, but multi-hop relay architecture could potentially provide greater capacity and coverage in the future. However, many complexities of the multi-hop relaying paradigm must be resolved. In this work, we focus on downlink resource allocation and relay selection, by which a user may be connected to a base station through a multi-hop relay and have several relay stations from which to choose within his range. To overcome the additional challenges introduced by multi-hop relay nodes, we propose a dynamic joint resource allocation and relay selection scheme. Numerical results are presented to demonstrate the validity of the proposed algorithm. © 2017 Springer Science+Business Media New York

Source title: Telecommunication Systems

Series Number: Volume 66 Issue 2

DOI : 10.1007/s11235-017-0286-3

Link: Dynamic Joint Resource Allocation and Relay Selection for 5G Multi-hop Relay Systems

Year: 2017

Abstract: 3GPP is currently studying the improvement on the LTE eMBMS system to provide more capabilities and flexibilties on delivering multicast/broadcast services using the LTE infrastructure. This paper investigates the performance of an improved LTE eMBMS system using layered-division-multiplexing (LDM) technology and longer cyclic prefix (CP). The link-layer performance of using two-layer LDM in eMBMS system is first investigated with extensive computer simulations. Coverage analysis is then conducted on future eMBMS services with different cyclic prefix (CP) lengths, to allow more efficient deployment of multicast/broadcast single-frequency-network (MBSFN) for different cell sizes. The coverage performance is then used to demonstrate the capability of the improved eMBMS system with LDM to simultaneously deliver high-definition (HD) indoor/mobile services and ultra-HD fixed services targeting receivers with rooftop antennas.

Source title:  IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2017

DOI : 10.1109/BMSB.2017.7986163

Link: Coverage Analysis on Improved LTE eMBMS with Layered-Division-Multiplexing and Longer Cyclic Prefix

Year: 2017

Abstract: The ATSC 3.0 next generation digital TV standard adopted state-of-the-art coding and modulation, as well as the new Layered Division Multiplexing (LDM) technology in addition to the traditional TDM/FDM. It is a very flexible system capable of combining different services in one RF channel with different robustness and reception conditions (fixed, handheld, mobile and indoor). The coverage for the ATSC 3.0 is very different from the legacy one tower one coverage ATSC 1.0 system. With the new enabling technologies, the ATSC 3.0 can greatly increase the coverage/service areas; reduce the distance between co-channel assignments; and introduce local program insertion and targeted advertisement. This paper discusses the ATSC 3.0 coverage and co-channel interference issues, with different operating parameters and using LDM technology. Similar to the LTE, the ATSC 3.0 co-channel assignment could be reduced to two times of service coverage radius (2R), under certain conditions. This can significantly improve the spectrum efficiency by up to 4 times in comparison with today's system. The deployment of Single Frequency Network (SFN) can further improve the coverage and reduce the interference.

Source title:  IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2017 (BMSB2017)

DOI : 10.1109/BMSB.2017.7986200

Link: Coverage Study of ATSC 3.0

Year: 2017

Abstract: Delivering local content in terrestrial digital TV (DTV) single-frequency-networks (SFNs) is of great interest to broadcasters, which can support business cases such as local news, location-based applications and targeted advertisements. The recently adopted Layered-Division-Multiplexing (LDM) technology offers a new solution to achieve high-throughput local content insertion from any transmitters, at anytime, and with flexible coverage areas. To achieve the high-throughput and flexible coverage of the local services delivered using LDM, the receivers need to estimate the specific channel response corresponding to the transmitter emitting the desired local service. This is difficult to achieve in reality since the ATSC 3.0 standard does not provide an inherent mechanism to help receivers obtain separate channel estimates when receiving signals from different transmitters in SFN. This paper addresses this challenge and presents several channel estimation solutions at receivers to enable high-efficiency local content insertion within an ATSC 3.0 SFN. In addition, a novel channel separation algorithm is proposed to significantly reduce the performance degradation caused by the inaccurate channel estimate due to the deterministic co-channel interference

Source title: IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2017

DOI : 10.1109/BMSB.2017.7986164

Link: Channel Estimation Strategy for Local Content Insertion in ATSC 3.0

Year: 2017

Abstract: This paper analyzes a potential configuration of ATSC 3.0 for delivering local services in a Single Frequency Network (SFN). This application is possible using Layered Division Multiplexing - Local Service Insertion (LDM-LSI). This technique uses the lower layer as the bearer of local services, injected well below the upper layer (A=19dB). The paper analyzes the bitrate requirements and mode configuration of each layer. The field strength planning values and the specific processing for calculating the coverage probability values are also described. Finally, the configuration proposed is evaluated on a specific environment (San Francisco) where a planning exercise with population and location coverage probability statistics is also provided. The results show that fixed service coverage of both global and local services on an SFN can be easily achieved using LDM LSI.

Source title:  IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2017 (BMSB2017)

DOI : 10.1109/BMSB.2017.7986206

Link: Network Planning for Local Service in ATSC 3.0 Single Frequency Networks

Year: 2017

Abstract: Due to the increasing spectrum scarcity caused by data-consuming multimedia applications over mobile and smart devices, efficient utilization of radio spectrum has been receiving tremendous interest during the past decades. Previous spectrum sharing techniques using cognitive radio might cause mis-detection and performance degradation of the incumbent users due to the limited sensing capability of devices and lack of timely information exchange between co-existing heterogeneous networks (HetNets). In this paper, an orchestrated spectrum sharing approach that integrates the distributed located users, base stations (BS), incumbent stations, and the Software-Defined Networking (SDN) controller into an amalgamated network with real-time information exchange is introduced. In order to effectively protect incumbent users and efficiently share the pooled spectrum resources, real-time 3D interference map is considered to guide the spectrum access based on the SDN global view. MATLAB simulation is conducted to verify the performance improvement.

Source title:  IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2017 (BMSB2017)

DOI : 10.1109/BMSB.2017.7986221

Link: Software Defined Orchestrated Spectrum Sharing Enabled by 3D Interference Map

Year: 2017

Abstract: Advanced Television Systems Committee (ATSC) 3.0, which is the new international standard for next generation broadcasting, allows to deliver multiple services with different reception conditions in a single RF channel. In the physical layer standard of ATSC 3.0, two kind of multiplexing schemes are adopted: orthogonal schemes including traditional time division multiplexing (TDM) and frequency division multiplexing (FDM), and a newly introduced non-orthogonal scheme, named layered division multiplexing (LDM). In this paper, we consider two services configured by LDM and TDM based on the ATSC 3.0 standard. Field test results which evaluate the mobile performance of LDM and TDM are provided.

Source title:  IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2017 (BMSB2017)

DOI : 10.1109/BMSB.2017.7986180

Link: Mobile Field Comparison Test of LDM and TDM Based on ATSC 3.0

Year: 2017

Abstract: In this paper, we present an efficient transmission method of multiple broadcasting services using Layered Division Multiplexing (LDM) and Scalable High Efficiency Video Coding (SHVC) for the next generation terrestrial digital broadcasting such as Advanced Television Systems Committee (ATSC) 3.0. Based on a two-layer LDM technology, each Physical Layer Pipe (PLP) carries each of Base Layer and Enhancement Layer video streams of SHVC, in order to maximize channel utilization when multiple broadcasting services are delivered in a single radio frequency (RF) channel. A performance analysis is conducted when the proposed combination of LDM and SHVC is compared with other combinations such as Time Division Multiplexing (TDM) and/or HEVC simulcast broadcasting. A constant quality measurement is introduced to evaluate the performance of video codec in conjunction with a physical layer system. The proposed combination of LDM and SHVC is implemented in hardware and verified in a real field environment.

Source title:  IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2017 (BMSB2017)

DOI : 10.1109/BMSB.2017.7986176

Link: Scalable HEVC over Layered Division Multiplexing for the Next Generation Terrestrial Broadcasting

Year: 2017

Abstract: In the ATSC 3.0 PHY layer standard, a Transmitter Identification (TxID) signal is defined in order to provide the identification of an ATSC 3.0 transmitter. For efficient use of spectrum and quality of service improvement, single frequency network (SFN) where all transmitters share a single RF channel is often implemented. The recently developed ATSC 3.0 physical layer standard has been designed to support SFN. For efficient designing, fine-tuning and operating an SFN, it is crucial to identify each transmitter, as well as to adjust transmitting power and emission time of each transmitter. This paper presents TxID for ATSC 3.0, and analyzes its detection performance under very low signal to noise ratio (SNR) environments.

Source title:  IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2017 (BMSB2017)

DOI : 10.1109/BMSB.2017.7986168

Link: Transmitter Identification for ATSC 3.0 Single Frequency Network

Year: 2017

Abstract: Effectively managing spectrum for an ever increasing wireless world requires an advanced agile and flexible regulatory environment that uses an extensive network of sensing devices to ensure the orderly and secure evolution of new advanced networks and technologies that work free from harmful interference. The Spectrum Environment Awareness (SEA) prototype system currently being developed at the Communications Research Centre (CRC) Canada is a system for the next generation spectrum management, aiming to help government regulators to have better control of how spectrum is being used by different services at different times and locations across Canada, and to ensure better use of spectrum and effective response to spectrum inquiries. In this paper, the SEA system functional architecture is introduced. As one of the key components within the SEA system, the integration of the intelligent tasking subsystem in SEA applications is described in detail.

Source title:  IEEE Int'l Symposium on Broadband Multimedia Systems and Broadcasting 2017

DOI : 10.1109/BMSB.2017.7986202

Link: Integration of Intelligent Tasking Subsystem in Spectrum Environment Awareness Applications