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2014 Australian Communications Theory Workshop (AusCTW)最新文献

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A network coding algorithm for video on demand multicast using a single server channel 一种基于单服务器信道的视频点播网络编码算法
2014 Australian Communications Theory Workshop (AusCTW) Pub Date : 2014-03-13 DOI: 10.1109/AusCTW.2014.6766419
Amy Fu, P. Sadeghi
{"title":"A network coding algorithm for video on demand multicast using a single server channel","authors":"Amy Fu, P. Sadeghi","doi":"10.1109/AusCTW.2014.6766419","DOIUrl":"https://doi.org/10.1109/AusCTW.2014.6766419","url":null,"abstract":"In this paper, we demonstrate a network coded transmission scheme that allows the implementation of multicast video on demand using a single server channel. A receiver is permitted to join the broadcast at any time, where after an initial startup delay, it is able to deliver packets at its channel rate. This transmission scheme is the first to allow in-order packet delivery while providing innovative information to all receivers at all times. We illustrate how this feature can be achieved by taking advantage of the early decoding properties of an existing network coding transmission scheme.","PeriodicalId":378421,"journal":{"name":"2014 Australian Communications Theory Workshop (AusCTW)","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133520286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Multi-cell opportunistic beamforming in interference-limited networks 干扰限制网络中的多小区机会波束形成
2014 Australian Communications Theory Workshop (AusCTW) Pub Date : 2014-03-13 DOI: 10.1109/AusCTW.2014.6766440
M. Wang, Tharaka Samarasinghe, J. Evans
{"title":"Multi-cell opportunistic beamforming in interference-limited networks","authors":"M. Wang, Tharaka Samarasinghe, J. Evans","doi":"10.1109/AusCTW.2014.6766440","DOIUrl":"https://doi.org/10.1109/AusCTW.2014.6766440","url":null,"abstract":"In this paper, we consider a cellular network operating according to the classical opportunistic beamforming and scheduling scheme. In a multi-cell network, interference is the main bottleneck on the communication rate, compared to noise. In this paper, we focus on deriving the ergodic downlink sum-rate scaling law for the system of interest considering an interference-limited regime (i.e., the high SNR region). More specifically, through deriving the moment generating function of the sum-rate, we show that the ergodic downlink sum-rate scales logarithmically as the number of users grows large. This result is different from the well-known double logarithmic sum-rate growth with increasing number of users due to the interference-limited assumption. Finally, numerical results are also presented to validate our analysis and provide further insights.","PeriodicalId":378421,"journal":{"name":"2014 Australian Communications Theory Workshop (AusCTW)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130561424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Frame-asynchronous physical-layer network coding using cyclic codes 使用循环码的帧异步物理层网络编码
2014 Australian Communications Theory Workshop (AusCTW) Pub Date : 2014-03-13 DOI: 10.1109/AusCTW.2014.6766435
Bao Nguyen, David Haley, Ying Chen
{"title":"Frame-asynchronous physical-layer network coding using cyclic codes","authors":"Bao Nguyen, David Haley, Ying Chen","doi":"10.1109/AusCTW.2014.6766435","DOIUrl":"https://doi.org/10.1109/AusCTW.2014.6766435","url":null,"abstract":"Physical-layer network coding (PNC) is an innovative technique for improving the efficiency of wireless communication systems. In theory, due to the utilisation of superimposed signals at a wireless relay, PNC can double the system throughput when compared to traditional point-to-point systems. However, achieving perfect synchronisation between transmitted signals at the relay is challenging. The use of cyclic low-density parity-check (LDPC) codes and cyclic redundancy check (CRC) to combat frame asynchrony in PNC has recently been proposed. In this paper, we propose a novel approach to cope with frame misalignment in PNC using cyclic codes with a cyclic prefix. We also introduce a new frame structure for PNC systems, which adopts Gold sequences as its pilot sequences. Due to particular properties of the Gold sequences, arrival delay between two signals overlapped at the relay can be estimated effectively. Simulation results show that cyclic prefix usage can significantly compensate for frame misalignment.","PeriodicalId":378421,"journal":{"name":"2014 Australian Communications Theory Workshop (AusCTW)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120943480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Analysis of adaptive least squares filtering in massive MIMO 大规模MIMO中的自适应最小二乘滤波分析
2014 Australian Communications Theory Workshop (AusCTW) Pub Date : 2014-03-13 DOI: 10.1109/AusCTW.2014.6766434
Zeeshan Azmat Shaikh, S. Hanly, I. Collings
{"title":"Analysis of adaptive least squares filtering in massive MIMO","authors":"Zeeshan Azmat Shaikh, S. Hanly, I. Collings","doi":"10.1109/AusCTW.2014.6766434","DOIUrl":"https://doi.org/10.1109/AusCTW.2014.6766434","url":null,"abstract":"This paper considers an adaptive beamforming algorithm for a massive MIMO system with multiple cells. The pilot contamination problem arises in multi-cell systems owing to transmission of the same pilots from users (or mobile stations) in different cells. The focus of this paper is to study the impact of different training sequences on pilot contamination in Massive MIMO systems. Specifically, we consider an adaptive beam-forming salgorithm which has been previously applied in MIMO interference networks. This algorithm uses bidirectional training in which training sequences are sent from current beamformers to adapt the mobile station receive filters and then the training sequences using mobile station filters as beamformers, are sent in reverse direction to adapt the beamformers at base station side. The adaptation of both transmit and receive filters is done using the least squares objective function. The adaptive beamforming algorithm shows improvement in performance in terms of average sum rate if the random training sequences are transmitted from users in different cells. Numerical results are presented to corroborate the mathematical analysis.","PeriodicalId":378421,"journal":{"name":"2014 Australian Communications Theory Workshop (AusCTW)","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115591534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Convergence analysis of performance-measure expressions for MIMO ZF under Rician fading MIMO ZF性能测度表达式的收敛性分析
2014 Australian Communications Theory Workshop (AusCTW) Pub Date : 2014-03-13 DOI: 10.1109/AusCTW.2014.6766438
C. Siriteanu, A. Takemura, S. Blostein, S. Kuriki, Hyundong Shin
{"title":"Convergence analysis of performance-measure expressions for MIMO ZF under Rician fading","authors":"C. Siriteanu, A. Takemura, S. Blostein, S. Kuriki, Hyundong Shin","doi":"10.1109/AusCTW.2014.6766438","DOIUrl":"https://doi.org/10.1109/AusCTW.2014.6766438","url":null,"abstract":"The performance of multiple-input/multiple-output (MIMO) communications systems employing spatial multiplexing and zero-forcing detection (ZF) has yet to be analyzed for several cases of practically-relevant Rician fading. For the special case of Rician-Rayleigh fading, we have recently derived a set of expressions for important MIMO ZF performance measures. They were obtained from the moment generating function of the signal-to-noise ratio (SNR) expressed in terms of the confluent hypergeometric function, i.e., an infinite-series. Herein, the prove the convergence of the ensuing infinite-series expressions obtained for the SNR probability density function, as well as for the ZF outage probability, average error probability, and ergodic capacity. For the ergodic-capacity infinite-series, we describe a computation method and discuss its numerical instability issues.","PeriodicalId":378421,"journal":{"name":"2014 Australian Communications Theory Workshop (AusCTW)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130878596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Capacity approaching analog fountain codes 容量接近模拟喷泉代码
2014 Australian Communications Theory Workshop (AusCTW) Pub Date : 2014-03-13 DOI: 10.1109/AusCTW.2014.6766421
M. Shirvanimoghaddam, Yonghui Li, B. Vucetic
{"title":"Capacity approaching analog fountain codes","authors":"M. Shirvanimoghaddam, Yonghui Li, B. Vucetic","doi":"10.1109/AusCTW.2014.6766421","DOIUrl":"https://doi.org/10.1109/AusCTW.2014.6766421","url":null,"abstract":"In this paper, we propose an analog fountain code (AFC) to approach the capacity of the Gaussian channel in a wide range of signal to noise ratios (SNRs). The proposed code is rateless as the number of the generated coded symbols is potentially limitless; thus, enabling the transmitter to automatically adapt to the channel condition and sending as many coded symbols as required by the destination. Each coded symbol in AFC is directly generated from information symbols, by linearly combining them with real weighting coefficients. Weight coefficients and the degree of each coded symbol are chosen from predetermined weight set and degree distribution function, respectively. We further formulate an optimization problem to find the optimum weight set in order to maximize the efficiency of the proposed code. Simulation results show that the proposed code can approach the capacity of the Gaussian channel across a wide range of SNR values.","PeriodicalId":378421,"journal":{"name":"2014 Australian Communications Theory Workshop (AusCTW)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127825804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Reducing codebook loss by using reconfigurable receive antennas in limited feedback precoded MIMO systems 在有限反馈预编码MIMO系统中使用可重构接收天线减少码本损耗
2014 Australian Communications Theory Workshop (AusCTW) Pub Date : 2014-03-13 DOI: 10.1109/AusCTW.2014.6766429
Uzma Afsheen, Peter J. Smith, Philippa A. Martin
{"title":"Reducing codebook loss by using reconfigurable receive antennas in limited feedback precoded MIMO systems","authors":"Uzma Afsheen, Peter J. Smith, Philippa A. Martin","doi":"10.1109/AusCTW.2014.6766429","DOIUrl":"https://doi.org/10.1109/AusCTW.2014.6766429","url":null,"abstract":"It is known that the performance of limited feedback precoding systems depends on the size of the codebook, determined by the number of feedback bits. Increasing the number of feedback bits improves performance. However, this in turn requires a significant increase in the control channel bandwidth. The goal of the proposed reconfigurable antenna codebook scheme is to improve the closed-loop precoding gain without increasing the number of feedback bits. We employ reconfigurable antennas at the receiver resulting in multiple possible channel conditions. We have shown through simulations that increasing the number of receive antenna states has the same effect as a bigger codebook in terms of received signal to noise ratio gain, improved symbol error rate and sum rate gain. Different codeword and RA state selection methods are considered for both single and multi-layer transmissions and different system sizes, using LTE and Grassmannian codebooks with MMSE and SVD receivers.","PeriodicalId":378421,"journal":{"name":"2014 Australian Communications Theory Workshop (AusCTW)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129430645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Identifying key design parameters for Monte Carlo simulation of Doppler spread channels 确定多普勒扩频信道蒙特卡罗仿真的关键设计参数
2014 Australian Communications Theory Workshop (AusCTW) Pub Date : 2014-03-13 DOI: 10.1109/AusCTW.2014.6766424
Paul Hirschausen, L. Davis, David Haley, Ken Lever
{"title":"Identifying key design parameters for Monte Carlo simulation of Doppler spread channels","authors":"Paul Hirschausen, L. Davis, David Haley, Ken Lever","doi":"10.1109/AusCTW.2014.6766424","DOIUrl":"https://doi.org/10.1109/AusCTW.2014.6766424","url":null,"abstract":"There are several approaches to the Monte Carlo simulation of a time-varying multipath radio channel with a given Doppler spectrum. This paper concentrates on a particular method in which the channel, having a discrete tapped-delay-line structure, is simulated by generating a time-varying Doppler spread channel tap for each resolvable delay path. Each channel tap is created by the addition of multiple sinusoidal echoes, where the frequency of an echo is assigned randomly based on the channel Doppler spectrum. A model of this type has three key parameters: the sampling rate, the number of sinusoidal echoes and the total number of samples used in the channel realisation. Quantitative criteria are developed which provide guidelines for selecting values of parameters in the simulator design. These criteria are illustrated by examining the performance of two simulated channels, one having the Jakes Doppler spectrum the other a Gaussian Doppler spectrum. The performance is measured in terms of a normalised root-mean-squared-error between the specified and the achieved Doppler spectra. We conclude that to keep the NRMSE of the achieved Doppler spectrum to within 10%, 200 sinusoids are sufficient, provided that a suitable sampling frequency is selected.","PeriodicalId":378421,"journal":{"name":"2014 Australian Communications Theory Workshop (AusCTW)","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129181738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Low complexity V-BLAST for massive MIMO 低复杂度V-BLAST大规模MIMO
2014 Australian Communications Theory Workshop (AusCTW) Pub Date : 2014-03-13 DOI: 10.1109/AusCTW.2014.6766422
Khawla A. Alnajjar, Peter J. Smith, G. Woodward
{"title":"Low complexity V-BLAST for massive MIMO","authors":"Khawla A. Alnajjar, Peter J. Smith, G. Woodward","doi":"10.1109/AusCTW.2014.6766422","DOIUrl":"https://doi.org/10.1109/AusCTW.2014.6766422","url":null,"abstract":"In an uplink massive multiple-input-multiple-output deployment with distributed single-antenna users and a large base-station array, we consider several combinations of receivers using linear combiners (maximum ratio combining (MRC) and zero forcing (ZF)) in conjunction with Vertical Bell Laboratories Layered Space Time (V-BLAST). We show that the performance loss of MRC relative to ZF can be removed in certain situations through the use of V-BLAST. Furthermore, we develop a low complexity ordering scheme which results in a V-BLAST scheme with MRC which has much less complexity than a single ZF linear combiner. An analysis of the signal-to-interference-and-noise-ratio at each stage of the V-BLAST approach is also given to support the findings of the proposed technique.","PeriodicalId":378421,"journal":{"name":"2014 Australian Communications Theory Workshop (AusCTW)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125520111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 20
Performance of indoor MIMO optical wireless system using linear receiver with prism array 棱镜阵列线性接收机室内MIMO光学无线系统性能研究
2014 Australian Communications Theory Workshop (AusCTW) Pub Date : 2014-03-13 DOI: 10.1109/AusCTW.2014.6766427
Thomas Q. Wang, J. Armstrong
{"title":"Performance of indoor MIMO optical wireless system using linear receiver with prism array","authors":"Thomas Q. Wang, J. Armstrong","doi":"10.1109/AusCTW.2014.6766427","DOIUrl":"https://doi.org/10.1109/AusCTW.2014.6766427","url":null,"abstract":"In this paper, we analyze the performance of an indoor MIMO optical wireless system with a linear receiver. The receiver uses an array of prisms to form channel matrices that can achieve angular diversity within a compact receiver structure. The transmission of light through a prism onto a photodetecting surface is analyzed showing that the channel gain depends on the orientation of the prisms. Thus, by arranging the prisms carefully, channel matrices with full rank can be formed in a multiple LED scenario, which facilitates the use of low complexity linear de-multiplexing algorithms, including zero-forcing (ZF) and minimum mean square error (MMSE). We present bit error rate (BER) results in a typical indoor scenario. It is shown that the BER varies with the position of the receiver, with relatively high values for the receiver located at the center and near the corners of the room.","PeriodicalId":378421,"journal":{"name":"2014 Australian Communications Theory Workshop (AusCTW)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129671105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
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