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2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)最新文献

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Approximate maximum likelihood source separation using the natural gradient 使用自然梯度近似最大似然源分离
2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471) Pub Date : 2001-03-20 DOI: 10.1109/SPAWC.2001.923891
Seungjin Choi, A. Cichocki, Liqing Zhang, S. Amari
{"title":"Approximate maximum likelihood source separation using the natural gradient","authors":"Seungjin Choi, A. Cichocki, Liqing Zhang, S. Amari","doi":"10.1109/SPAWC.2001.923891","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923891","url":null,"abstract":"This paper addresses a maximum likelihood approach to source separation in the case of overdetermined mixtures corrupted by additive white Gaussian noise. We present an objective function that is an approximate likelihood function based on the Laplace approximation. Then we derive a natural gradient adaptation algorithm which maximizes the corresponding approximate likelihood function. Useful behavior of the proposed method is verified by numerical experiments.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"2014 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121442091","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: 27
Blind adaptive decorrelating decision-feedback multiuser detection for multirate synchronous DS/CDMA communications 多速率同步DS/CDMA通信盲自适应去相关决策反馈多用户检测
2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471) Pub Date : 2001-03-20 DOI: 10.1109/SPAWC.2001.923876
V. Kaweevat, S. Jitapunkul, C. Archavawanitchakol, S. Wanichpakdeedecha, N. Rasrikriangkrai
{"title":"Blind adaptive decorrelating decision-feedback multiuser detection for multirate synchronous DS/CDMA communications","authors":"V. Kaweevat, S. Jitapunkul, C. Archavawanitchakol, S. Wanichpakdeedecha, N. Rasrikriangkrai","doi":"10.1109/SPAWC.2001.923876","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923876","url":null,"abstract":"A three-rate synchronous DS/CDMA system provides service to low, medium and high bit rate users, and all kinds of user have the same chip rate. Previously, two types of decorrelators have been proposed: a high-rate decorrelator (HRD), and a low-rate decorrelator (LRD). It has been observed that the LRD provides better performance than the HRD for all users at the expense of higher complexity and longer demodulation delay for high-rate users. To improve the performance and reduce the demodulation delay, a decorrelating decision feedback detector (DF) has been proposed. Although the DF has less complexity than that of the LRD, the complexity of DF is still high. This paper presents a blind adaptive decorrelating decision-feedback detector (BADF) which uses a bootstrap algorithm to decrease the complexity of DF and eliminates the singular-matrix problem of the decorrelator.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125090854","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
On weight initialization for adaptive multistage parallel interference cancellation in CDMA systems CDMA系统中自适应多级并行干扰抵消的权值初始化
2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471) Pub Date : 2001-03-20 DOI: 10.1109/SPAWC.2001.923880
Chin-Liang Wang, Kuo-Ming Wu, M. Lai
{"title":"On weight initialization for adaptive multistage parallel interference cancellation in CDMA systems","authors":"Chin-Liang Wang, Kuo-Ming Wu, M. Lai","doi":"10.1109/SPAWC.2001.923880","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923880","url":null,"abstract":"We present a new way of finding the initial weights for an adaptive multistage parallel interference cancellation (PIC) scheme proposed recently. The proposed initialization approach is on the basis of minimizing the mean residual interference power at each stage of cancellation and involves a calculation of the Q-function. To reduce its computational complexity, a table look-up approach is presented to simplify the design. Computer simulations show that the proposed initialization method makes the adaptive multistage PIC scheme converge much faster than the original scheme with fixed initialization, which in turn reduces the number of iterations required per stage.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123210060","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
De-reverberation using frequency-domain center clipper 使用频域中心剪去混响
2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471) Pub Date : 2001-03-20 DOI: 10.1109/SPAWC.2001.923925
S. Kuo, D. Sun
{"title":"De-reverberation using frequency-domain center clipper","authors":"S. Kuo, D. Sun","doi":"10.1109/SPAWC.2001.923925","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923925","url":null,"abstract":"This paper presents the development and analysis of audio de-reverberation algorithms. The modified frequency-sampling filter (FSF) provides an effective filter bank for splitting a signal into equally spaced frequency channels. The center clipper with optimized voice-activity detector and inverse room transfer function (RTF) is employed at each frequency bin. The nonlinear center-clipping operation is analyzed in theory using a sinusoidal signal and Fourier transform. The results show that the clipper generates odd harmonics and may be reduced by a simple low-pass filter. Computer simulations using real speech and measured RTF show that reverberation effects are suppressed successfully with no obvious distortions.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123361095","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
Improvement of partial interference cancellation receiver using variance from matched filter for weight factor assignment and adaptation in multirate CDMA cellular mobile communication systems 多速率CDMA蜂窝移动通信系统中基于方差匹配滤波器的加权因子分配与自适应部分干扰消除接收机的改进
2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471) Pub Date : 2001-03-20 DOI: 10.1109/SPAWC.2001.923884
N. Prapavong, W. Benjapolakul
{"title":"Improvement of partial interference cancellation receiver using variance from matched filter for weight factor assignment and adaptation in multirate CDMA cellular mobile communication systems","authors":"N. Prapavong, W. Benjapolakul","doi":"10.1109/SPAWC.2001.923884","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923884","url":null,"abstract":"The objective of this article is to propose a new method to adapt the weight factor applying for partial interference cancellation in multirate CDMA cellular mobile communication systems. The proposed scheme in weight factor decision utilizing matched filter output variance from the previous stage is compared with groupwise weighted PIC (GW-PIC) and standard PIC (SPIC). The simulation results show that performance of the proposed method is better than that of the GW-PIC and the SPIC.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124642226","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
High-rate differential space-code modulation for interference suppression 用于干扰抑制的高速率差分空码调制
2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471) Pub Date : 2001-03-20 DOI: 10.1109/SPAWC.2001.923904
Jianhua Liu, E. Larsson, Jian Li, Hongbin Li
{"title":"High-rate differential space-code modulation for interference suppression","authors":"Jianhua Liu, E. Larsson, Jian Li, Hongbin Li","doi":"10.1109/SPAWC.2001.923904","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923904","url":null,"abstract":"Space-time coding has been receiving much research attention recently due to the potential offered by fully exploiting spatial and temporal diversity. A differential space-time modulation (DSTM) scheme was recently proposed to perform demodulation without channel state information, which is attractive in fast fading channels where accurate channel estimates are difficult to obtain. More recently, a differential space-code modulation (DSCM) scheme, which is an improvement of DSTM for combating interference (including intentional and unintentional jamming) signals, was proposed. DSCM significantly outperforms DSTM when interference is present. This advantage, however, is achieved at the cost of a lower transmission rate, a wider bandwidth, or a combination of both. To alleviate this problem, we extend DSCM to a so-called high-rate DSCM (HR-DSCM) scheme, which increases the data rate considerably at the cost of a slightly higher bit error rate, while still maintaining the interference suppression capability.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116089705","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
Unbiased blind separation using the threshold nonlinearity 利用阈值非线性进行无偏盲分离
2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471) Pub Date : 2001-03-20 DOI: 10.1109/SPAWC.2001.923892
H. Mathis, M. Joho
{"title":"Unbiased blind separation using the threshold nonlinearity","authors":"H. Mathis, M. Joho","doi":"10.1109/SPAWC.2001.923892","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923892","url":null,"abstract":"The stability analysis of blind signal separation algorithms using the threshold nonlinearity is extended to discrete distributions, such as used in digital communication systems. Conditions for the threshold parameter are derived. An extension to the standard algorithm mitigates separation coefficient bias, which is introduced by additive noise at the sensors. Simulations quantify the improvement in terms of steady-state interchannel interference.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127178363","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
Performance losses in V-BLAST due to fading V-BLAST中由于衰落造成的性能损失
2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471) Pub Date : 2001-03-20 DOI: 10.1109/SPAWC.2001.923906
R. Malasani, K. Giridhar
{"title":"Performance losses in V-BLAST due to fading","authors":"R. Malasani, K. Giridhar","doi":"10.1109/SPAWC.2001.923906","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923906","url":null,"abstract":"New insights into the information theoretic aspects of multiple antenna systems have led to the development of numerous blind and training-based schemes that exploit the high data rate capacities of diversity systems. One such popular training-based spatial multiplexing technique is the Vertical Bell Labs Layered Space Time Architecture (V-BLAST). The common practice in the literature is to assume that the channel remains constant over some time interval, whose duration is proportional to the coherence time of the channel. This is not often true since the channel is continuously varying, although the variation is slow in some cases. For our analysis, the channel coefficients are modeled as a first-order autoregressive process. We then show that even in slow fading channels, the performance losses are considerable. One surprising and rather non-intuitive result is that the performance losses are higher at higher average signal-to-noise ratios. We have simulated V-BLAST with such a channel model to confirm the validity of our analysis.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125605535","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
Microphone array signal processing for far-talking speech recognition 用于远距离语音识别的麦克风阵列信号处理
2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471) Pub Date : 2001-03-20 DOI: 10.1109/SPAWC.2001.923915
Jen-Tzung Chien, J. Lai, Po-Yin Lai
{"title":"Microphone array signal processing for far-talking speech recognition","authors":"Jen-Tzung Chien, J. Lai, Po-Yin Lai","doi":"10.1109/SPAWC.2001.923915","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923915","url":null,"abstract":"This paper presents a combined microphone array and model adaptation algorithm for distant speech recognition. We aim at resolving the inconvenience of using a head-mounted/hand-holding microphone in a conventional speech recognizer. To improve the distant speech quality, a linear microphone array is applied and acts as a robust acquisition system. We develop a time-domain coherence measure (TDCM) to precisely detect the time delay of speech signals collected by different microphones. The estimated delay is adopted in a delay-and-sum beamformer for speech enhancement. Further, we adapt the speech hidden Markov models to get close to the acoustic condition of enhanced test speech for robust speech recognition. In acquisition and recognition experiments on connected Chinese digits, we find that TDCM can estimate the time delay as precisely as that calculated assuming the speech source direction is known. Increase of speech sampling rate is helpful to determine time delay. Also, the incorporation of the model adaptation scheme can significantly reduce the recognition errors with moderate computation overhead.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"448 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131391707","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
Design and FPGA implementation of orthonormal inverse discrete wavelet transforms 正交离散逆小波变换的设计与FPGA实现
2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471) Pub Date : 2001-03-20 DOI: 10.1109/SPAWC.2001.923924
M. Nibouche, A. Bouridane, O. Nibouche, A. Belatreche
{"title":"Design and FPGA implementation of orthonormal inverse discrete wavelet transforms","authors":"M. Nibouche, A. Bouridane, O. Nibouche, A. Belatreche","doi":"10.1109/SPAWC.2001.923924","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923924","url":null,"abstract":"FPGA technology offers the potential for low cost and high performance for certain applications, including signal and image processing. Although the programming model which FPGA typically present to application developers is prohibitively low level, they are good target devices for rapid prototyping. The purpose of this paper is to present a novel bit-serial structure dedicated to inverse discrete wavelet transforms based on time-interleaved FIR filters. To overcome the problem of wait cycles within the structure, a second line of bit adders is provided. This allows the structure to use additional \"dummy\" cycles to deal with additional bits. The proposed structure is modular and scalable, which allows a bit-level parameterisation. To assess the effectiveness of the approach the design has been implemented efficiently on the Xilinx 4000 series FPGA.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131825053","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
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