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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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A low complexity channel estimation scheme for the WB-CDMA terminal 一种用于WB-CDMA终端的低复杂度信道估计方案
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.2001.923847
E. Batut
{"title":"A low complexity channel estimation scheme for the WB-CDMA terminal","authors":"E. Batut","doi":"10.1109/SPAWC.2001.923847","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923847","url":null,"abstract":"Channel estimation is of crucial importance for tomorrow's wireless mobile communication systems. However, high-performance algorithms often come at the cost of a high computational complexity, which makes them unsuitable for the terminal equipment. A low-complexity version of an iterative channel estimator is proposed for the third-generation WB-CDMA (wideband code division multiple access) terminal. Its performance compares favorably with that of the original version. Furthermore, a novel criterion for false-path detection is introduced, thus avoiding useless computations being performed later on. Possible improvements are proposed.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"108 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":"131154264","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
Linear prediction based semi-blind estimation of MIMO FIR channels 基于线性预测的MIMO FIR信道半盲估计
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.2001.923843
A. Medles, T. Slock, E. Carvalho, Eurecom
{"title":"Linear prediction based semi-blind estimation of MIMO FIR channels","authors":"A. Medles, T. Slock, E. Carvalho, Eurecom","doi":"10.1109/SPAWC.2001.923843","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923843","url":null,"abstract":"The multichannel aspect has led to the development of a wealth of blind channel estimation techniques over the last decade. However, most of these blind techniques are not very robust and only allow us to estimate the channel up to a number of ambiguities, especially in the MIMO case. On the other hand, all current standardized communication systems employ some form of known inputs to allow channel estimation. The channel estimation performance in those cases can always be improved by a semi-blind approach which exploits both training and blind information. The purpose of this paper is to introduce semi-blind techniques of which the complexity is not immensely much higher than that of training-based techniques. The semi-blind criteria are quadratic and combine a training-based least-squares criterion with a blind criterion based on linear prediction. A variety of convenient linear prediction approaches are considered.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"15 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":"116270547","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: 65
Signal detection and timing estimation via summation likelihood ratio test 信号检测和时序估计通过求和似然比检验
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.2001.923888
H. Chen, C. Ravishankar, Wei Lu
{"title":"Signal detection and timing estimation via summation likelihood ratio test","authors":"H. Chen, C. Ravishankar, Wei Lu","doi":"10.1109/SPAWC.2001.923888","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923888","url":null,"abstract":"This paper presents a novel scheme for improving signal detection and timing estimation in communication systems that employ unique words (reference symbols) to aid signal acquisition. The newly proposed algorithm which is termed summation likelihood ratio test (SLRT) performs a summation of likelihood values over a suitable search range. Computer simulations of the SLRT and the generalized likelihood ratio test (GLRT) have been performed for a particular classification scenario of the traffic channel (TCH) and the fast associated control channel (FACCH) traditionally used in terrestrial wireless communications systems such as GSM and mobile satellite communication systems. The simulation results demonstrate that the SLRT outperforms the GLRT significantly.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"1 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":"114213911","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
Trellis coding of L-phase-level coherent frequency/phase modulated signals l相级相干频率/相位调制信号的栅格编码
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.2001.923898
Fu-Chuan Hung, Char-Dir Chung
{"title":"Trellis coding of L-phase-level coherent frequency/phase modulated signals","authors":"Fu-Chuan Hung, Char-Dir Chung","doi":"10.1109/SPAWC.2001.923898","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923898","url":null,"abstract":"This paper investigates the trellis-coded schemes based on a newly developed L-phase-leveled coherent frequency/phase modulation (LCFPM) for the additive white Gaussian noise channel. Comparison with conventional joint frequency and phase modulations is given in terms of power and bandwidth efficiencies. It is found that the trellis-coded LCFPM is highly competitive in power and bandwidth efficiencies in comparison to conventional dual-frequency joint frequency and phase modulations.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"35 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":"124947415","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
Adaptive narrow-band interference cancellation in DS-CDMA communications DS-CDMA通信中的自适应窄带干扰消除
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.2001.923882
Wen-Sheng Hou, Bor‐Sen Chen
{"title":"Adaptive narrow-band interference cancellation in DS-CDMA communications","authors":"Wen-Sheng Hou, Bor‐Sen Chen","doi":"10.1109/SPAWC.2001.923882","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923882","url":null,"abstract":"In the presence of narrowband interference (NBI), the performance of direct-sequence code-division multiple access (DS-CDMA) communication systems can be improved by using various interference cancellation schemes. A scheme of parallel interference cancellators (PIC), which includes a set of NBI cancellation filters and a set of multiple access interference (MAI) cancellation filters, is developed to improve the signal-to-interference ratio (SIR) and handle the MAI effect. In order to avoid performance deterioration due to the unreliable initial detection, a robust coefficient /spl gamma/ is introduced in our proposed design criterion.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"2 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":"124312371","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
Image compression using auto-associative neural network and embedded zero-tree coding 图像压缩采用自关联神经网络和嵌入式零树编码
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.2001.923933
S. Patnaik, R. Pal
{"title":"Image compression using auto-associative neural network and embedded zero-tree coding","authors":"S. Patnaik, R. Pal","doi":"10.1109/SPAWC.2001.923933","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923933","url":null,"abstract":"This paper presents an image compression method using auto-associative neural network and embedded zero-tree coding. The role of the neural network (NN) is to decompose the image stage by stage, which enables analysis similar to wavelet decomposition. This works on the principle of principal component extraction (PCE). Network training is achieved through a recursive least squares (RLS) algorithm. The coefficients are arranged in a four-quadrant sub-band structure. The zero-tree coding algorithm is employed to quantize the coefficients. The system outperforms the embedded zero-tree wavelet scheme in a rate-distortion sense, with best perceptual quality for a given compression ratio.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"30 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":"122375802","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
Near-far resistant single-user channel identification by interference subspace rejection in wideband CDMA 基于干扰子空间抑制的宽带CDMA近远抗单用户信道识别
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.2001.923842
S. Affes, H. Hansen, P. Mermelstein
{"title":"Near-far resistant single-user channel identification by interference subspace rejection in wideband CDMA","authors":"S. Affes, H. Hansen, P. Mermelstein","doi":"10.1109/SPAWC.2001.923842","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923842","url":null,"abstract":"The single-user CDMA spatio-temporal array receiver (STAR-SU) can be extended to a multiuser version (STAR-MU) by incorporating interference subspace rejection (ISR) using spatio-temporal null-beamforming. We can exploit the data-projection step implemented there to enhance the channel identification for STAR-SU so that it is significantly more robust to near-far power variations than the previous formulation. Our approach effectively decomposes the MU subspace tracking into much simpler single-user 1D subspace tracking operations. Simulations on the downlink reveal that the performance of the new STAR-SU is close to the single-user bound even for near-far ratios as high as 18 dB.","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":"124027410","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 joint spatial and temporal equalizer using separated spatial and temporal signal processing for broadband mobile radio communications 一种使用分离时空信号处理的联合时空均衡器，用于宽带移动无线电通信
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.2001.923908
S. Tomisato, T. Matsumoto
{"title":"A joint spatial and temporal equalizer using separated spatial and temporal signal processing for broadband mobile radio communications","authors":"S. Tomisato, T. Matsumoto","doi":"10.1109/SPAWC.2001.923908","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923908","url":null,"abstract":"Joint spatial and temporal equalization techniques are considered most effective in reducing the effects of cochannel interference (CCI) and intersymbol interference (ISI) in broadband mobile communications. This paper proposes a new configuration of spatial and temporal equalizer (S/T-equalizer) using separated spatial and temporal signal processing. The S/T-equalizer combines concepts of the adaptive array antenna (AAA) and temporal equalizer (TE). An iterative parameter estimation technique is also proposed for the S/T-equalizer. Computer simulations were conducted to demonstrate the effectiveness of the proposed S/T-equalizer. Results of computer simulations show that the proposed S/T-equalizer can achieve excellent performance in the presence of CCI and ISI.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"44 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":"126345120","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
Analysis of IQ imbalance on initial frequency offset estimation in direct down-conversion receivers 直接下变频接收机初始频偏估计的IQ不平衡分析
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.2001.923870
V. Ma, T. Ylamurto
{"title":"Analysis of IQ imbalance on initial frequency offset estimation in direct down-conversion receivers","authors":"V. Ma, T. Ylamurto","doi":"10.1109/SPAWC.2001.923870","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923870","url":null,"abstract":"The effect of IQ imbalance on the initial frequency offset estimation algorithm in an orthogonal frequency division multiplexing (OFDM) direct conversion receiver is studied. The impact of the phase and amplitude IQ imbalances and channel response on the frequency offset estimation is formulated for a flat channel case. Analysis of the IQ imbalance on the frequency offset estimation is provided and the results are presented in this paper. The results show that the frequency offset estimation algorithm generates an error in the estimated offset frequency with IQ imbalance and the error can be reduced by an appropriate choice of the correlation window length.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"1 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":"125762577","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: 21
Quasi-orthogonal sequences Quasi-orthogonal序列
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.2001.923896
S. Matsufuji, K. Takatsukasa, Y. Watanabe, N. Kuroyanagi, N. Suehiro
{"title":"Quasi-orthogonal sequences","authors":"S. Matsufuji, K. Takatsukasa, Y. Watanabe, N. Kuroyanagi, N. Suehiro","doi":"10.1109/SPAWC.2001.923896","DOIUrl":"https://doi.org/10.1109/SPAWC.2001.923896","url":null,"abstract":"This paper discusses quasi-orthogonal sequences consisting of real elements, whose periodic out-of-phase autocorrelation functions take zero except for a shift corresponding to the half period. It is shown that they can be formalized by use of the Fourier transform. As a special case, binary quasi-orthogonal sequences are found until period 196 from a conjecture for their constructions.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"63 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":"132080045","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
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