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1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)最新文献

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Blind channel identification in high-data-rate pulse shaping OFDM/OQAM systems 高数据速率脉冲整形OFDM/OQAM系统中的盲信道识别
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783042
H. Bolcskei, P. Duhamel, R. Hleiss
{"title":"Blind channel identification in high-data-rate pulse shaping OFDM/OQAM systems","authors":"H. Bolcskei, P. Duhamel, R. Hleiss","doi":"10.1109/SPAWC.1999.783042","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783042","url":null,"abstract":"Pulse shaping OFDM systems based on offset QAM (OFDM/OQAM) are particularly attractive for wireless high-data-rate applications. Since OFDM/OQAM schemes do not employ a cyclic prefix, equalization has to be performed. In this paper, we introduce an algorithm for blind channel identification in pulse shaping OFDM/OQAM systems. Our approach assumes that the receiver knows the transmitter pulse shaping filter. Exploiting cyclostationarity of the received OFDM signal blind channel identification is accomplished using second-order statistics only. The proposed method exhibits low noise sensitivity, is computationally efficient, and does not require knowledge of the channel order. Finally, we provide simulation results demonstrating the performance of the new algorithm.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121934108","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
Uplink and downlink beamforming for fading channels 衰落信道的上行和下行波束形成
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783090
M. Bengtsson, B. Ottersten
{"title":"Uplink and downlink beamforming for fading channels","authors":"M. Bengtsson, B. Ottersten","doi":"10.1109/SPAWC.1999.783090","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783090","url":null,"abstract":"We highlight some issues in the design of beamformers for transmission and reception in communications systems with antenna arrays at the base stations. We assume a radio channel characterized by frequency flat Rayleigh fading which is correlated (but not coherent) from antenna element to antenna element. Different design criteria are considered and we show the relationship between downlink and uplink formulations and solutions. The resulting beamformers are typically given by quadratically constrained optimization problems which could be expected to give increased robustness to signal cancellation. Unfortunately, signal cancellation is still present, but diagonal loading can be introduced to minimize the problem.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126431358","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: 10
Performance analysis of non-coherent BFSK in a Nakagami fading channel using equal gain and post detection selection combining 等增益与检测后选择相结合的中川衰落信道非相干BFSK性能分析
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783095
P. Kontodios, R. Hippenstiel, T. Ha
{"title":"Performance analysis of non-coherent BFSK in a Nakagami fading channel using equal gain and post detection selection combining","authors":"P. Kontodios, R. Hippenstiel, T. Ha","doi":"10.1109/SPAWC.1999.783095","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783095","url":null,"abstract":"Theoretical results and bit error probability plots are obtained for BFSK in a Nakagami-m fading channel using equal gain combining (ECG) and post detection selection combining (PDSC).","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114800726","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
Semi-blind collision resolution in random access wireless networks 随机接入无线网络中的半盲冲突解决
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783019
Qing Zhao, L. Tong
{"title":"Semi-blind collision resolution in random access wireless networks","authors":"Qing Zhao, L. Tong","doi":"10.1109/SPAWC.1999.783019","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783019","url":null,"abstract":"Signal processing based collision resolution for random access wireless networks with unknown propagation channels is considered. As a performance measure for receivers with a collision resolution capability, the resolvability function is defined as the probability of resolving at least k packets from K colliding ones given m known data symbols embedded in the data packets. The resolvability performance of the zero-forcing and the semi-blind least squares smoothing receivers is analyzed, which demonstrates significant improvement of semi-blind approaches over trained algorithms that rely entirely on known symbols in the data packets.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131092506","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
On correlation matching approaches to multipath parameter estimation in multiuser CDMA systems 多用户CDMA系统中多径参数估计的相关匹配方法
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783013
Z. Xu, M.K. Tsarsanis
{"title":"On correlation matching approaches to multipath parameter estimation in multiuser CDMA systems","authors":"Z. Xu, M.K. Tsarsanis","doi":"10.1109/SPAWC.1999.783013","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783013","url":null,"abstract":"In this paper, correlation matching techniques are employed to estimate multipath parameters for a multiuser CDMA system. We first parameterize the receiver's output correlation matrix by different unknown channel parameters for all users. Then we match the correlation matrix against its sample average estimated from the received data. The Frobenious norm of the resulting error matrix is minimized to simultaneously obtain a closed form solution for all channel-parameters. Batch as well as adaptive algorithms are developed. The identifiability of the proposed technique is studied. Finally, some simulation results are presented to verify the proposed methods.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134520336","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
A multi-delay whitening approach to blind identification and equalization of SIMO channels 一种基于多时延白化的SIMO信道盲识别与均衡方法
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783059
Jitendra Tugnait
{"title":"A multi-delay whitening approach to blind identification and equalization of SIMO channels","authors":"Jitendra Tugnait","doi":"10.1109/SPAWC.1999.783059","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783059","url":null,"abstract":"Blind channel estimation and blind equalization of SIMO (single-input multiple-output) communication channels is considered using only the second-order statistics of the data. Estimation of (partial) channel impulse response and design of finite-length MMSE (minimum mean-square error) blind equalizers is investigated. The basis of the approach is the design of multiple zero-forcing equalizers that whiten the noise-free data at multiple delays. In the past such an approach has been considered using just one zero-forcing equalizer at zero-delay. Infinite impulse response (IIR) channels are allowed. The proposed approach also works when the \"sub-channel\" transfer functions have common zeros so long as the common zeros are minimum-phase zeros. The channel length or model orders need not be known. An illustrative simulation example is provided.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130939685","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
A fast Gaussian maximum-likelihood method for blind multichannel estimation 一种快速高斯极大似然盲多信道估计方法
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783073
E. de Carvalho, D. Slock
{"title":"A fast Gaussian maximum-likelihood method for blind multichannel estimation","authors":"E. de Carvalho, D. Slock","doi":"10.1109/SPAWC.1999.783073","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783073","url":null,"abstract":"We propose a blind maximum-likelihood method for FIR multichannel estimation, denoted GML. The GML criterion is derived assuming the input symbols as Gaussian random variables. The performance of GML (computed based on the true symbol distribution) is compared through numerical evaluations to the optimally weighted covariance matching method: both methods are equivalent in a certain asymptotic sense. A fast implementation of the scoring algorithm is proposed to solve GML.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126535942","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
Comparison between multicode with fixed spreading and single code with variable spreading options in UTRA/TDD UTRA/TDD中固定扩频多码与可变扩频单码的比较
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783084
P. Agin, F. Gourgue
{"title":"Comparison between multicode with fixed spreading and single code with variable spreading options in UTRA/TDD","authors":"P. Agin, F. Gourgue","doi":"10.1109/SPAWC.1999.783084","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783084","url":null,"abstract":"Europe is proposing a system called the Universal Mobile Telecommunication System (UMTS) as a candidate for IMT-2000. It is characterized by a FDD and a TDD mode, both with a CDMA component. Two options are being considered for the spreading for the TDD mode: a multicode option, where each user may have several codes of fixed length, and a single code option, where each user always has one code, but with a variable length. This paper compares the peak-to-average ratio as well as the receiver complexity and performances for both options. It shows that the single code option enables to decrease the complexity by up to 50% and to increase the performances by up to 1 dB, compared to the multicode option. The single code option allows in addition a reduced peak-to-average ratio of the RF signal, resulting in a more efficient power amplifier.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132877208","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
Semi-blind signal estimation for smart antennas using subspace tracking 基于子空间跟踪的智能天线半盲信号估计
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783071
J. Laurila, K. Kopsa, E. Bonek
{"title":"Semi-blind signal estimation for smart antennas using subspace tracking","authors":"J. Laurila, K. Kopsa, E. Bonek","doi":"10.1109/SPAWC.1999.783071","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783071","url":null,"abstract":"We discuss a semi-blind algorithm for smart antennas that utilises user identifiers that are available in existing cellular systems in addition to some structural signal properties. Our algorithm estimates, first, the row span of the adequately composed data matrix. In this part we gain a factor of up to 70 in computational complexity by employing subspace tracking algorithms. After that we project the obtained basis vectors iteratively to the finite alphabet constellation. We call the projection part of our algorithm DILSF (decoupled iterative least-squares with subspace fitting). Assuming two co-channel users in a GSM-like TDMA system and a Rayleigh fading channel with finite angular spread, we obtained a BER<10/sup -3/ with only 3 antennas, spaced 10/spl lambda/ apart. We also investigate the effect of the rank estimation accuracy on the performance and find the algorithm insensitive to minor rank estimation errors.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114674401","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
Blind channel identification using RLS method based on second-order statistics 基于二阶统计量的RLS盲信道识别方法
1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304) Pub Date : 1999-05-09 DOI: 10.1109/SPAWC.1999.783023
T. Kimura, H. Sasaki, H. Ochi
{"title":"Blind channel identification using RLS method based on second-order statistics","authors":"T. Kimura, H. Sasaki, H. Ochi","doi":"10.1109/SPAWC.1999.783023","DOIUrl":"https://doi.org/10.1109/SPAWC.1999.783023","url":null,"abstract":"In this paper, we propose a new blind identification algorithm which is based on second order statistics and exploits a single-input double-output (SIDO) model. It is suitable for a real-time processing system because of lower operation and high-speed convergence. The proposed blind identification algorithm is superior to conventional algorithms in view of simple structure and the uniqueness of solution. We also verify its efficiency by computer simulation.","PeriodicalId":365086,"journal":{"name":"1999 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications (Cat. No.99EX304)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115458260","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
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