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2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications最新文献

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Baseband Compensation of Transmitter and Receiver IQ Imbalance for OFDM in Frequency Selective Fading Channels 频率选择衰落信道中收发IQ不平衡的基带补偿
2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2006-07-02 DOI: 10.1109/SPAWC.2006.346367
J. Oostveen, A. Schoonen, F. Willems
{"title":"Baseband Compensation of Transmitter and Receiver IQ Imbalance for OFDM in Frequency Selective Fading Channels","authors":"J. Oostveen, A. Schoonen, F. Willems","doi":"10.1109/SPAWC.2006.346367","DOIUrl":"https://doi.org/10.1109/SPAWC.2006.346367","url":null,"abstract":"In this paper, we present a baseband algorithm for estimation and compensation of transmitter and receiver IQ imbalance for OFDM in a frequency-selective fading channel. We show by simulations that the negative effect of IQ imbalance on system performance can be almost completely removed by the proposed algorithm. The algorithm is an iterative loop, consisting of consecutively channel estimation, Rx IQ imbalance estimation, Tx IQ imbalance estimation and data estimation","PeriodicalId":414942,"journal":{"name":"2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129987923","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
Filtered Delay-Subspace Approach for Pilot Assisted Channel Estimation in OFDM Systems OFDM系统中导频辅助信道估计的滤波延迟子空间方法
2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2006-07-02 DOI: 10.1109/SPAWC.2006.346421
R. Vigelis, D. C. Moreira, J. Mota, C. Cavalcante
{"title":"Filtered Delay-Subspace Approach for Pilot Assisted Channel Estimation in OFDM Systems","authors":"R. Vigelis, D. C. Moreira, J. Mota, C. Cavalcante","doi":"10.1109/SPAWC.2006.346421","DOIUrl":"https://doi.org/10.1109/SPAWC.2006.346421","url":null,"abstract":"In this paper we propose a pilot-based OFDM channel estimator based on the combination of low-pass filtering and delay-subspace projection. The proposed estimator, which we abbreviate ST-LP, is robust in the sense it does not require prior statistical knowledge of the channel. The only assumptions are the least-square (LS) estimates have limited spectrum and the channel follows the tapped delay line (TDL) model, which are commonly taken in practice. Since it is desirable slow delay variations operability acceptance, the delay-subspace is tracked by a subspace tracking (ST) algorithm. The ST-LP estimator can be implemented by two filtering structures, which provide a trade-off between accuracy and complexity. Simulation results confirm the superior performance of the ST-LP estimator when compared to methods already reported in the literature","PeriodicalId":414942,"journal":{"name":"2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications","volume":"2006 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134579087","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
Compress-And-Forward Cooperative Relaying in MIMO-OFDM Systems MIMO-OFDM系统中的压缩转发协同中继
2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2006-07-02 DOI: 10.1109/SPAWC.2006.346494
S. Simoens, Josep Vidalt, Olga Mufiozt
{"title":"Compress-And-Forward Cooperative Relaying in MIMO-OFDM Systems","authors":"S. Simoens, Josep Vidalt, Olga Mufiozt","doi":"10.1109/SPAWC.2006.346494","DOIUrl":"https://doi.org/10.1109/SPAWC.2006.346494","url":null,"abstract":"In this paper, we investigate the capacity of compress-and-forward (C&F) cooperative relaying scheme when the C&F relay operates in time division duplex (TDD). In our evaluation we consider MIMO-OFDM transmission. An achievable rate was previously derived in (A. Host-Madsen et al., 2005) assuming scalar channel. We extend this Wyner-Ziv bound to MIMO-OFDM, by applying results from Bayesian vector estimation and rate-distortion coding theory. Then we derive the mutual information of a sub-optimum relaying scheme in which the relay applies Karhunen-Loeve transform to the signal received from the source before quantizing it and forwarding it to the destination as a new codeword. Finally, we illustrate by simulations (in an environment similar to IEEE 802.16) the fact that for some scenarios, the C&F approach outperforms other known relaying techniques. This remains true even if the C&F sub-optimum scheme is considered","PeriodicalId":414942,"journal":{"name":"2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133696190","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: 20
Adaptive Asynchronous CCI Cancellation: Selection of the Regularization Parameter for Regularized Semi-Blind Technique 自适应异步CCI对消:正则化半盲技术的正则化参数选择
2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2006-07-02 DOI: 10.1109/SPAWC.2006.346368
A. M. Kuzminskiy, Yuri I. Abramovich
{"title":"Adaptive Asynchronous CCI Cancellation: Selection of the Regularization Parameter for Regularized Semi-Blind Technique","authors":"A. M. Kuzminskiy, Yuri I. Abramovich","doi":"10.1109/SPAWC.2006.346368","DOIUrl":"https://doi.org/10.1109/SPAWC.2006.346368","url":null,"abstract":"A asynchronous interference cancellation problem is addressed when training and working data intervals are available containing the desired signal and arbitrary overlapping interference. A regularized non-iterative semi-blind estimation of the antenna array coefficients is considered, which employs the autocorrelation matrix estimation as a weighted sum of the autocorrelation matrices estimated over the training and working data intervals. On-line selection of the regularization parameter is proposed. A simple switched selection algorithm is developed based on the constant modulus criterion. It is shown by means of simulations in TDMA and OFDM environments that the adaptive regularization parameter allows significant performance improvement compared to any fixed regularization parameter in a wide range of the asynchronous interference scenario parameters","PeriodicalId":414942,"journal":{"name":"2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131865220","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 Estimation for Single-Carrier Space-Time Block Coded Transmission with Frequency-Domain Equalization: A Diagonal Precoding Based Approach 基于对角预编码的单载波空时分组编码频域均衡盲信道估计
2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2006-07-02 DOI: 10.1109/SPAWC.2006.346362
Jwo-Yuh Wu, Ta-Sung Lee
{"title":"Blind Channel Estimation for Single-Carrier Space-Time Block Coded Transmission with Frequency-Domain Equalization: A Diagonal Precoding Based Approach","authors":"Jwo-Yuh Wu, Ta-Sung Lee","doi":"10.1109/SPAWC.2006.346362","DOIUrl":"https://doi.org/10.1109/SPAWC.2006.346362","url":null,"abstract":"Relying on non-redundant diagonal preceding and i.i.d. source assumption, we propose a blind channel estimation scheme for single-carrier frequency-domain equalization based space-time block coded systems. The proposed method exploits the precoding-induced linear signal structure in the conjugate cross-correlation between the two temporal block receive signals as well as the circulant channel matrix property, and can yield exact solutions whenever the channel noise is circularly Gaussian and the receive data statistic is perfectly obtained. The channel estimation formulation builds on rearranging the set of linear equations relating the entries of conjugate cross-correlation matrix and products of channel impulse responses into one with a distinctive block-circulant with circulant-block (BCCB) structure. This allows a simple identifiability condition depending on precoder parameters alone, and also provides a natural yet effective optimal precoder design framework against imperfect data estimation. We consider the data mismatch as a deterministic perturbation and propose to minimize the condition number of the BCCB system matrix, leading to a simple closed-form optimal solution. Numerical examples are used to illustrate the performance of the proposed method","PeriodicalId":414942,"journal":{"name":"2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132221249","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
Exploiting Cyclic Prefix for Performance Improvement in Single Carrier Systems 利用循环前缀改进单载波系统的性能
2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2006-07-02 DOI: 10.1109/SPAWC.2006.346409
B. Devillers, J. Louveaux, L. Vandendorpe
{"title":"Exploiting Cyclic Prefix for Performance Improvement in Single Carrier Systems","authors":"B. Devillers, J. Louveaux, L. Vandendorpe","doi":"10.1109/SPAWC.2006.346409","DOIUrl":"https://doi.org/10.1109/SPAWC.2006.346409","url":null,"abstract":"Cyclic prefixed single carrier (CP-SC) transmission over frequency selective channels is considered. In conventional CP-SC systems, the cyclic prefix is discarded at the receiver side. This suboptimal strategy allows simple frequency domain equalization. In this paper, a new CP-SC receiver exploiting the whole received signal (including the cyclic prefix) for data estimation is proposed. With reasonable additional complexity, the proposed architecture outperforms the conventional CP-SC receiver, in terms of bit error rate. Simulations results show that the proposed scheme also improves the goodput, i.e. error-free rate, of the communication link","PeriodicalId":414942,"journal":{"name":"2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133389716","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: 17
Nonlinear Predistortion for OFDM SDMA Systems OFDM SDMA系统的非线性预失真
2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2006-07-02 DOI: 10.1109/SPAWC.2006.346386
R. Habendorf, G. Fettweis
{"title":"Nonlinear Predistortion for OFDM SDMA Systems","authors":"R. Habendorf, G. Fettweis","doi":"10.1109/SPAWC.2006.346386","DOIUrl":"https://doi.org/10.1109/SPAWC.2006.346386","url":null,"abstract":"This paper investigates nonlinear predistortion techniques for the downlink of OFDM systems from a transmitter equipped with multiple antennas to non-cooperative single antenna mobile stations. Although the performance of nonlinear predistortion schemes like Tomlinson Harashima precoding (THP) strongly depends on the ordering of the precoded symbols, current THP approaches apply data independent sorting algorithms. A tree search algorithm is proposed which combines matrix decomposition and the feedback structure of the precoder to compute a data dependent precoding order","PeriodicalId":414942,"journal":{"name":"2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124810218","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
Design of Serially-Concatenated LDGM Coded MIMO Systems 串行级联LDGM编码MIMO系统设计
2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2006-07-02 DOI: 10.1109/SPAWC.2006.346411
F. J. Vázquez-Araújo, M. Gonzales-Lopez, L. Castedo, J. Garcia-Frías
{"title":"Design of Serially-Concatenated LDGM Coded MIMO Systems","authors":"F. J. Vázquez-Araújo, M. Gonzales-Lopez, L. Castedo, J. Garcia-Frías","doi":"10.1109/SPAWC.2006.346411","DOIUrl":"https://doi.org/10.1109/SPAWC.2006.346411","url":null,"abstract":"Serially-concatenated low-density generator matrix (SCLDGM) codes are an attractive scheme to approach the capacity of single input single output (SISO) channels due to the low computational cost of the encoding and decoding procedures. In this paper we investigate the design of SCLDGM codes for the spatial multiplexing over multiple input multiple output (MIMO) wireless communication channels. SCLDGM codes are constructed using an optimization procedure based on tracking the decoding behaviour of the sum-product algorithm (SPA) using extrinsic information transfer (EXIT) functions. We present results for different antenna configurations, showing that the optimized SCLDGM codes exhibit better performance than standard low density parity check (LDPC) codes with similar encoding complexity","PeriodicalId":414942,"journal":{"name":"2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125720763","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
Proportional Fair Power Allocation for OFDM-CDM Systems in Frequency-Selective Rayleigh Fading Channels 频率选择瑞利衰落信道下OFDM-CDM系统的比例公平功率分配
2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2006-07-02 DOI: 10.1109/SPAWC.2006.346467
F. Brah, J. Louveaux, L. Vandendorpe
{"title":"Proportional Fair Power Allocation for OFDM-CDM Systems in Frequency-Selective Rayleigh Fading Channels","authors":"F. Brah, J. Louveaux, L. Vandendorpe","doi":"10.1109/SPAWC.2006.346467","DOIUrl":"https://doi.org/10.1109/SPAWC.2006.346467","url":null,"abstract":"Orthogonal frequency division multiplexing with code division multiplexing (OFDM-CDM) is one of the combined schemes of OFDM and CDMA techniques. The CDM component enables additional diversity in frequency selective fading channels. This paper proposes an optimal power allocation via proposal-fair strategy for the OFDM-CDM-based systems. A zero-forcing beamformer is used at the mobile unit and the basestation optimizes its power allocation to maximize the sum-rate subject to fairness constraints. Two optimization techniques are proposed. Simulation results are provided for typical downlink situation and a fairness index is compared to that of system optimized without fairness request","PeriodicalId":414942,"journal":{"name":"2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127683947","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
Adaptive Channel Estimation for OFDM Systems with Doppler spread 多普勒扩频OFDM系统的自适应信道估计
2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2006-07-02 DOI: 10.1109/SPAWC.2006.346485
R. Cannizzaro, P. Banelli, G. Leus
{"title":"Adaptive Channel Estimation for OFDM Systems with Doppler spread","authors":"R. Cannizzaro, P. Banelli, G. Leus","doi":"10.1109/SPAWC.2006.346485","DOIUrl":"https://doi.org/10.1109/SPAWC.2006.346485","url":null,"abstract":"In this paper, we propose adaptive channel estimation for orthogonal frequency division multiplexing (OFDM) in fast time-varying (TV) channels. A basis expansion model (BEM) approach is used to capture the time variation of the channel within each OFDM block, and to reduce the estimator dimensionality. Capitalizing on the BEM structure and on a frequency domain training, two adaptive approaches are proposed, based on Kalman filtering and recursive least squares (LS) methods, which exploit the time correlation of the channel between successive blocks and do not require any a-priori knowledge of the channel statistics. Simulation results show that, compared to classical least squares and statistically-aided linear minimum mean squared error (LMMSE) approaches, the two proposed techniques effectively estimate the channel, adapt fast to its non stationary changes, thus enabling efficient TV channel equalization of the inter-carrier interference (ICI) induced in OFDM systems by high Doppler spreads","PeriodicalId":414942,"journal":{"name":"2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129750256","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: 38
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