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2013 Australian Communications Theory Workshop (AusCTW)最新文献

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Analysis of Self-Het OFDM enhancements for 60GHz indoor RF channels 60GHz室内射频信道自热OFDM增强分析
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510058
N. Fernando, Y. Hong, E. Viterbo
{"title":"Analysis of Self-Het OFDM enhancements for 60GHz indoor RF channels","authors":"N. Fernando, Y. Hong, E. Viterbo","doi":"10.1109/AusCTW.2013.6510058","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510058","url":null,"abstract":"In this paper, we consider two enhancements for self-heterodyne OFDM (Self-Het OFDM): subcarrier pairing and smart carrier positioning (SCP). We analyze their performance over a practical 60 GHz indoor RF channel. This channel deviates from the standard AWGN and Rayleigh fading models for Line of Sight (LoS) and Non LoS. We show that for NLoS channels they can jointly improve the diversity order and performance by 7.7 dB at BER of 10-2, when compared to the standard self-het OFDM. Similar improvements are observed for channels with strong LoS components.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132614237","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: 7
The state-dependent degraded broadcast diamond channel 状态依赖的降级广播菱形信道
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510045
Min Li, O. Simeone, A. Yener
{"title":"The state-dependent degraded broadcast diamond channel","authors":"Min Li, O. Simeone, A. Yener","doi":"10.1109/AusCTW.2013.6510045","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510045","url":null,"abstract":"A state-dependent degraded broadcast diamond channel is studied where the source-to-relays cut is modeled with two noiseless, finite-capacity digital links with a degraded broadcasting structure, while the relays-to-destination cut is a general multiple access channel controlled by a random state. It is assumed that the source has non-causal channel state information, the relays have no state information and the destination may or may not have state information. First, the capacity is found for the case where the destination has access to the state sequence. It is demonstrated that a joint message and state transmission scheme via binning is optimal. Next, for the case with state information at the source only, lower and upper bounds on the capacity are derived for the general discrete memoryless model. Achievable rates are then computed for the case in which the relays-to-destination cut is affected by an additive Gaussian state.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123840086","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
Repeat-accumulate codes for block-fading channels 块衰落信道的重复累积码
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510041
Rajan Kadel, G. Lechner
{"title":"Repeat-accumulate codes for block-fading channels","authors":"Rajan Kadel, G. Lechner","doi":"10.1109/AusCTW.2013.6510041","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510041","url":null,"abstract":"We design systematic and regular repeat-accumulate (RA) codes for non-ergodic block-fading channels. An encoder structure of RA codes for block-fading channels with an arbitrary number of fading blocks is proposed. Simulation results show that the proposed RA codes achieve full-diversity word error rate (WER) performance over block-fading channels. In addition, the WER performance of the proposed RA codes is superior to the root-low-density parity-check (LDPC) and repeat and blockwise accumulate (RBA) codes. Furthermore, the gap from the outage probability remains constant with increasing block length for the proposed RA codes. Besides an easy encoding structure, the proposed RA codes have notably less ones in the parity-check matrix compared to corresponding root-LDPC codes. Therefore, the decoding complexity of the proposed RA codes is significantly less than the corresponding root-LDPC codes.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115644436","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: 7
Ultra-low delay lossy audio coding using DPCM and block companded quantization 使用DPCM和块压缩量化的超低延迟有损音频编码
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510042
G. Simkus, M. Holters, U. Zölzer
{"title":"Ultra-low delay lossy audio coding using DPCM and block companded quantization","authors":"G. Simkus, M. Holters, U. Zölzer","doi":"10.1109/AusCTW.2013.6510042","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510042","url":null,"abstract":"Real-time audio transmission requires good quality for a restricted channel capacity and minimum latency. An ultra-low delay audio coding scheme based on differential pulse code modulation (DPCM) and block companded quantization is presented. The prediction filter of the base backward DPCM codec is attained as a FIR filter in lattice structure. The proposed block based audio coding introduces an algorithmic latency below one millisecond and an overhead of less than a half bit per sample. The advantage of the block companded quantization with DPCM is the capability to follow rapid changes in the signal. Therefore, it significantly improves the perceptual audio quality compared to a plain DPCM coding scheme with an adaptive quantizer.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114716769","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
Near field broadband beam space antenna array processor for multiple Interference Canceler 用于多干扰消除的近场宽带波束空间天线阵列处理器
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510036
Md. Rakibul Islam, M. Reed
{"title":"Near field broadband beam space antenna array processor for multiple Interference Canceler","authors":"Md. Rakibul Islam, M. Reed","doi":"10.1109/AusCTW.2013.6510036","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510036","url":null,"abstract":"A beam space processor is a two beam processor also referred to as Postbeamformer Interference Canceler (PIC) which cancels only one interference by forming two beams, a signal beam and an interference beam. This paper extends the PIC processor using the improved interference beams (IIB) for a number of interferences by deriving the expression of signal to interference plus noise ratio (SINR) and studies its performance when an array is situated in the near field of broadband acoustic sources. A number of examples are presented to show the performance, capability of distance discrimination and robustness against location errors of the proposed broadband beamformer.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"s1-11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127194502","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
Performance of multi-mode transmission with finite rate feedback in MIMO broadcast systems MIMO广播系统中有限速率反馈的多模传输性能
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510059
Nikeeth Ramanathan, Feng Li, M. Kuijper, J. Evans
{"title":"Performance of multi-mode transmission with finite rate feedback in MIMO broadcast systems","authors":"Nikeeth Ramanathan, Feng Li, M. Kuijper, J. Evans","doi":"10.1109/AusCTW.2013.6510059","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510059","url":null,"abstract":"This paper investigates the performance of adaptive transmission mode selection by user scheduling using zero-forcing beamforming (ZFBF) and finite-rate feedback (FRF). ZFBF is quite promising for multiple-input multiple-output (MIMO) broadcast systems, due to its simplicty. ZFBF can be utilized in compound with FRF, where the quantised channel direction information (CDI) of each user is fedback to the base station, and utilized to reduce the inter-user interference. User selection plays an important role in enhancing the performance of ZFBF systems. Recent progress on user scheduling in conjunction with multi-mode transmission schemes form the resulting investigations in this paper. This paper analyses an enhanced multi-mode transmission scheme along with proposed improvements on rate approximations at the user-side and shows promising results via monte-carlo simulations.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123262232","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
A multi-hop bidirectional relay selection scheme based on Viterbi algorithm 基于Viterbi算法的多跳双向中继选择方案
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510064
Q. You, Zhuo Chen, Yonghui Li, Xiaofeng Tao
{"title":"A multi-hop bidirectional relay selection scheme based on Viterbi algorithm","authors":"Q. You, Zhuo Chen, Yonghui Li, Xiaofeng Tao","doi":"10.1109/AusCTW.2013.6510064","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510064","url":null,"abstract":"In this paper, we propose a low-complexity multihop bidirectional relay selection (RS) scheme to enable simultaneous information exchange between two sources. The proposed RS scheme draws on the analogy between the node distribution of the general multi-hop bidirectional relay network model and the trellis of a convolutional code, and applies the Viterbi algorithm in selecting a path to minimize the sum outage probability of two sources. Specifically, the multi-hop bidirectional relay network model is first mapped to a convolutional code trellis. The branch metric in the trellis is defined as the instantaneous SNR of the channel connecting two relays in two adjacent clusters. Therefore, the path metric, which is defined as the minimum of all the branch metrics along the path, approximately equals the equivalent SNR of the multi-hop bidirectional path. Then, the sliding window Viterbi algorithm is applied to select a path between two sources. Simulation results show that the proposed multi-hop bidirectional RS scheme achieves almost the same outage probability as the optimal multi-hop bidirectional RS scheme when the window size is sufficiently large.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132430235","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
FSO/RF correlation measurement and hybrid system hidden Markov model FSO/RF相关测量与混合系统隐马尔可夫模型
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510051
A. Khatoon, W. Cowley, N. Letzepis
{"title":"FSO/RF correlation measurement and hybrid system hidden Markov model","authors":"A. Khatoon, W. Cowley, N. Letzepis","doi":"10.1109/AusCTW.2013.6510051","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510051","url":null,"abstract":"The mean fade correlation between free space optical (FSO) and radio frequency (RF) channels is measured using experimental data collected from a 1550nm FSO and 37GHz RF, terrestrial links. The joint statistics of the FSO/RF channels under different weather conditions are simulated using a continuous density hidden Markov model (HMM) and shown to match real measurements for specific weather types. A two state hybrid FSO/RF channel simulator is used to extend the HMM to simulate the daily and seasonal variation of FSO/RF channels. Using the weather statistics of Adelaide, this simple two state channel simulator can predict the fading statistics of the hybrid channel for summer and winter seasons. The simulated results confirm that the proposed simulator can efficiently replicate the mean fade correlation and model the joint statistics of hybrid FSO/RF channels under various weather and meteorological conditions.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133714791","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
A new cross-layer user scheduler for delay and symbol error probability in wireless multimedia relay networks 一种针对无线多媒体中继网络中延迟和符号错误概率的跨层用户调度方法
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510044
Malcolm Egan, Phee Lep Yeoh, M. Elkashlan, I. Collings
{"title":"A new cross-layer user scheduler for delay and symbol error probability in wireless multimedia relay networks","authors":"Malcolm Egan, Phee Lep Yeoh, M. Elkashlan, I. Collings","doi":"10.1109/AusCTW.2013.6510044","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510044","url":null,"abstract":"We propose a new scheduler for the dual-hop amplify-and-forward wireless multimedia relay network (WMRN). Our scheduler is designed to account for delay and symbol error probability (SEP). We develop a cross-layer scheduling approach for the downlink to balance these system metrics. Our scheduler is based on a new metric we call the delay in packet scheduling (DPS). The user with the largest weighted signal-to-noise ratio is scheduled, where the weight is a function of the DPS.We then derive analytical expressions for the probability mass function of the DPS, and the SEP of the scheduled user in Rayleigh fading. We verify our analysis via simulations. We show the probability that a target DPS is met is 30% higher for our new scheme compared to the standard opportunistic equal weight scheduler, with negligible degradation in the SEP of the scheduled user.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133741210","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
Modified semi-orthogonal User Scheduling scheme with optimized user selection parameter 改进的半正交用户调度方案，优化了用户选择参数
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510054
M. Wang, Feng Li, J. Evans
{"title":"Modified semi-orthogonal User Scheduling scheme with optimized user selection parameter","authors":"M. Wang, Feng Li, J. Evans","doi":"10.1109/AusCTW.2013.6510054","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510054","url":null,"abstract":"In the original Semi-orthogonal User Scheduling (SUS) scheme, there is a parameter that controls the degree of orthogonality of channel directions between co-scheduled users. However, choosing a good value for the parameter is known to be hard. In this paper, we consider optimizing the parameter in a slightly modified setup, where users are scheduled purely based on their channel directions. With the objective to maximize the system throughput, we demonstrate how to optimize the parameter in the case of perfect feedback (i.e. the base station has the perfect knowledge of users' channel directions) as well as in the case of limited feedback.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133935647","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
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