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Multi-speaker beamforming for voice activity classification 用于语音活动分类的多扬声器波束成形
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510055
Thuy N. Tran, W. Cowley, A. Pollok
{"title":"Multi-speaker beamforming for voice activity classification","authors":"Thuy N. Tran, W. Cowley, A. Pollok","doi":"10.1109/AusCTW.2013.6510055","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510055","url":null,"abstract":"In a multi-speaker environment, voice activity classification (VAC) attempts to identify active speaker(s) at different recording periods. Using a beamformer-output-ratio (BOR) from a multi-beamforming system, an efficient solution for VAC is available by comparing the calculated BOR with pre-specified thresholds. Considering two speakers, this paper derives theoretical results on BOR statistics, including the probability distribution function and the cumulative distribution function (c.d.f.) of the BOR employing an assumption that the narrow-band signal power in the frequency domain is Gamma distributed. Using the c.d.f. of the BOR, the thresholds for VAC can be automatically calculated via a closed form expression for given acceptable mis-detection rates. The method is tested with simulated recording setups for a non-reverberant environment and a 0.3 second reverberation time environment. Both simulations show high accuracy for the classification.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"17 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":"120983355","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
Optimal estimation of TOA in the TDOA problem TDOA问题中TOA的最优估计
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510046
J. Sorensen
{"title":"Optimal estimation of TOA in the TDOA problem","authors":"J. Sorensen","doi":"10.1109/AusCTW.2013.6510046","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510046","url":null,"abstract":"In the time difference of arrival (TDOA) problem, the unknown location of an emitter is estimated using a set of TDOA estimates. In this paper, a closed-form solution for a nominal TOA in the TDOA problem is presented for the case of three or four receivers that under certain conditions results in location estimates that are optimal in the least-square error sense.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"9 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":"123931998","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
Frequency offset compensation in physical-layer network coding systems 物理层网络编码系统中的频率偏移补偿
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510060
Ying Chen, David Haley, Quoc Bao Nguyen
{"title":"Frequency offset compensation in physical-layer network coding systems","authors":"Ying Chen, David Haley, Quoc Bao Nguyen","doi":"10.1109/AusCTW.2013.6510060","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510060","url":null,"abstract":"Physical layer network coding (PNC) has the potential to improve the spectral efficiency of wireless relay communications by utilising the superposition of signal propagation. In the ideal case, PNC can double the throughput of a symmetric relay network when compared to conventional time division multiplexing. However, in practice imperfect channel conditions and hardware can lead to time and frequency offsets at the relay receiver that degrade PNC performance.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"151 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":"123921222","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
Adaptive symbol-rate free-space-optical communications 自适应符号速率自由空间光通信
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AUSCTW.2013.6510056
W. Cowley, K. Nguyen, D. Giggenbach
{"title":"Adaptive symbol-rate free-space-optical communications","authors":"W. Cowley, K. Nguyen, D. Giggenbach","doi":"10.1109/AUSCTW.2013.6510056","DOIUrl":"https://doi.org/10.1109/AUSCTW.2013.6510056","url":null,"abstract":"Free space optical communications through fading atmospheric channels can achieve improved throughput by using adaptive transmission techniques. This paper considers the use of adaptive symbol-rate and transmit-power methods. We use an idealised model of channel coding that assumes zero errors can be achieved above some SNR threshold and adjust the transmission rate and power as the channel varies to operate above the required threshold. Results are presented for two noise models appropriate to non-coherent photodetection. Substantial performance gains are demonstrated compared to non-adaptive transmission. Most of the benefit from adaptive power control can be obtained with modest peak to average power constraints.","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":"125943364","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: 8
Impact of channel estimation error on secure transmission design 信道估计误差对安全传输设计的影响
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510038
Biaoshi He, Xiangyun Zhou
{"title":"Impact of channel estimation error on secure transmission design","authors":"Biaoshi He, Xiangyun Zhou","doi":"10.1109/AusCTW.2013.6510038","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510038","url":null,"abstract":"In this paper, we investigate the secure transmission design with practical assumptions on the channel state information (CSI). Specifically, the CSI of the legitimate link is imperfectly estimated and the CSI of the eavesdropper is unknown to the legitimate users. We derive both a fixed-rate and an adaptive-rate transmission schemes by explicitly considering the rate parameters of the wiretap code in the secure transmission design. The derived schemes achieve the maximum throughput subject to constraints on the secrecy performance against eavesdropping and the reliability performance against channel estimation error. For a given target throughput requirement, our numerical results illustrate how the security performance needs to be compromised when the accuracy of channel estimation reduces. One interesting finding is that the security cost of having a small amount of channel estimation error is low, while the security cost increases fast when the channel estimation error becomes considerable.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"26 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":"125235844","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
Decoder-aided synchronization for multiuser CDMA systems 多用户CDMA系统的解码器辅助同步
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510040
J. Kodithuwakku, N. Letzepis, A. Grant, R. McKilliam
{"title":"Decoder-aided synchronization for multiuser CDMA systems","authors":"J. Kodithuwakku, N. Letzepis, A. Grant, R. McKilliam","doi":"10.1109/AusCTW.2013.6510040","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510040","url":null,"abstract":"This paper addresses the problem of frame synchronization in code division multiple access systems in the presence of high multiple access interference. Already acquired user signals are regenerated using soft information from the respective decoders and subtracted from the received signal to mitigate multiple access interference. We consider partial cancellation of interference after few decoder iterations for fast acquisition of remaining weak users. Hence the effect of residual interference after cancellation is considered in the derivation of the time offset estimator. We consider both data-aided and non-data-aided scenarios. Our approach uses linear pre-processing (whitening filter) on the interference cancelled signal for further performance improvement. Analytical expressions for the missed detection probability of a given user are derived. These analytical results are verified via Monte-Carlo simulations. We compare conventional code acquisition to our whitening filter method within the parallel interference cancellation framework.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"31 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":"125731451","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
Optimal multiuser detection in a cooperative two-cell network 合作双蜂窝网络中的最优多用户检测
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510035
R. Senanayake, Phee Lep Yeoh, J. Evans
{"title":"Optimal multiuser detection in a cooperative two-cell network","authors":"R. Senanayake, Phee Lep Yeoh, J. Evans","doi":"10.1109/AusCTW.2013.6510035","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510035","url":null,"abstract":"We derive new theoretical bounds on the minimum bit error probability (BEP) of optimal multiuser joint detection in the uplink of a cooperative cellular network. To identify key insights, we consider the basic two-cell cooperative scenario where the signals transmitted by two users are jointly detected at two base stations. For such a network, we derive closed-form expressions for upper and lower bounds on the minimum BEP with independent Rayleigh fading and path loss between the users and the base stations. We further evaluate these expressions asymptotically to characterize the diversity order at high signal-to-noise ratios (SNRs). We observe that the lower bound accurately approximates the BEP simulation at low SNRs while the upper bound is accurate in the medium to high SNRs.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"46 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":"127158985","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: 9
A polarimetric line-of-sight channel model for MIMO satellite communications MIMO卫星通信的偏振视距信道模型
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510052
Nicholas P. Lawrence, L. Davis, David Haley
{"title":"A polarimetric line-of-sight channel model for MIMO satellite communications","authors":"Nicholas P. Lawrence, L. Davis, David Haley","doi":"10.1109/AusCTW.2013.6510052","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510052","url":null,"abstract":"Spatial multiple-input multiple-output (MIMO) offers increased rate and/or reliability in rich scattering environments such as that of a multipath non-line-of-sight (NLOS) channel. In line-of-sight (LOS) dominated conditions, spatial diversity is reduced. Dual polarisation signalling has been shown to successfully exploit polarisation diversity when LOS is dominant. For satellite systems, such state-of-the-art dual-polarisation techniques do not currently account for the 3D geometry of the link, and specifically the polarisation mismatch from misalignment of the antenna elements. Performance loss due to the mismatch in antenna orientation can be overcome by using 3D polarimetric antennas at both the transmitter and receiver. In this paper, we present a novel polarimetric LOS MIMO channel model by combining satellite geometry, the Friis equation and polarisation mismatch. Our emphasis is on polarisation mismatch and how this varies over the field-of-view (FOV). Our model offers the opportunity for 3D polarimetric signalling techniques to deliver enhanced and more consistent link performance over the FOV.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"82 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":"114262706","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
Comparison of coding strategies for the block fading erasure wiretap channel 块衰落擦除窃听信道编码策略的比较
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AusCTW.2013.6510062
A. Wickramasooriya, I. Land, R. Subramanian
{"title":"Comparison of coding strategies for the block fading erasure wiretap channel","authors":"A. Wickramasooriya, I. Land, R. Subramanian","doi":"10.1109/AusCTW.2013.6510062","DOIUrl":"https://doi.org/10.1109/AusCTW.2013.6510062","url":null,"abstract":"In this paper we study the block fading binary erasure wiretap channel, where the transmitter sends secret messages to a legitimate receiver over a block fading erasure channel in the presence of an eavesdropper. The eavesdropper receives the transmitted secret message over a separate block fading binary erasure channel. It is assumed that the transmitter knows the instantaneous channel state information (CSI) of the main channel and knows only the probability distribution of the capacity of the wiretap channel. We mainly consider the case where the transmitter adapts the code based on the CSI of the main channel in order to achieve either a certain secrecy rate or a certain level of secrecy. We compare the two proposed scenarios for the adaptive coding method based on the probability of secrecy outage and the average throughput.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"6 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":"130881846","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
Puncturing optimization algorithm and its applications in free space communications 穿刺优化算法及其在自由空间通信中的应用
2013 Australian Communications Theory Workshop (AusCTW) Pub Date : 2013-05-02 DOI: 10.1109/AUSCTW.2013.6510061
M. Khan, W. Cowley, K. Nguyen
{"title":"Puncturing optimization algorithm and its applications in free space communications","authors":"M. Khan, W. Cowley, K. Nguyen","doi":"10.1109/AUSCTW.2013.6510061","DOIUrl":"https://doi.org/10.1109/AUSCTW.2013.6510061","url":null,"abstract":"Radio frequency (RF) spectrum is already crowded and expensive to install new broadband channels. Free space optical (FSO) communication is an emerging technology which offers enormous bandwidth, low cost installation setup and highly secure link. But FSO link deteriorates significantly due to scintillation and weather conditions (fog/cloud). Hybrid FSO/RF communication system with independent coding scheme was suggested to combat fading effects of the individual communication system. We propose hybrid FSO/RF communication system with joint coding scheme and implement the puncturing optimization algorithm (POA) which adaptively tackle fading effects of the individual communication system. The proposed algorithm gives better performance gain over the fixed system and provide optimized puncturing fractions in a flexible fashion for a given channel condition.","PeriodicalId":177106,"journal":{"name":"2013 Australian Communications Theory Workshop (AusCTW)","volume":"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":"134202013","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: 6
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