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2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)最新文献

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Optimal MU-MIMO precoder with MISO decomposition approach 基于MISO分解方法的最佳MU-MIMO预编码器
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670810
Mustapha Amara, Y. Yuan-Wu, D. Slock
{"title":"Optimal MU-MIMO precoder with MISO decomposition approach","authors":"Mustapha Amara, Y. Yuan-Wu, D. Slock","doi":"10.1109/SPAWC.2010.5670810","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670810","url":null,"abstract":"This paper proposes a new iterative implementation algorithm for sum-rate maximization in a Multiuser MIMO system (MU-MIMO). The proposed algorithm is based on joint precoder and decoder optimization. For that we considered the best existing precoder design algorithm for a MISO multiuser system proposed in [1]. This algorithm is based on the Lagrangian sum-rate maximization procedure. For the receiving part, an optimal receiver is designed based on the system throughput maximization derived in the general case from the sum-rate expression given for a MU-MIMO broadcast channel. To link these two optimal algorithms, we use an iterative procedure transforming the MU-MIMO channel for each iteration into a MU-MISO channel trough virtual channel calculations. Finally to validate our prosed solution we compare it with an existing MMSE based iterative optimization algorithm. This algorithm proposed in [2] is based on an MMSE as well at the transmission side than at the receiving side. The obtained results demonstrate significant gains without introducing neither supplementary complexity nor resource needs.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114487676","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
Efficient interpolation of precoding matrices in MIMO-OFDM systems MIMO-OFDM系统中预编码矩阵的有效插值
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671092
Yuanjue Chou, T. Sang
{"title":"Efficient interpolation of precoding matrices in MIMO-OFDM systems","authors":"Yuanjue Chou, T. Sang","doi":"10.1109/SPAWC.2010.5671092","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671092","url":null,"abstract":"One way of fully exploiting the channel capacity in multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems is to deploy precoding vectors derived from SVD to form parallel data pipes. Optimal precoding requires accurate channel state information for each OFDM subcarrier. This paper proposes a limited channel decomposition architecture by using an interpolation method to reduce the computation cost of precoding. In this scheme, only on the pilot subcarriers the estimated channel information is used to get SVD decomposition results, and precoding vectors on other subcarriers are obtained by an orthogonal interpolation method. The interpolation relies on an important assumption that the singular modes on adjacent subcarriers change approximately in a linear way. Numerical simulations suggests that with appropriate settings, e.g., proper FFT size and interpolation gap etc., the proposed scheme can reduce computation efficiently while only sacrifice little performance.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127374359","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
A nearly optimal resource allocation algorithm for the downlink of OFDMA 2-D networks with multicell interference 多小区干扰下OFDMA 2-D网络下行链路近乎最优的资源分配算法
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671053
N. Ksairi, P. Bianchi, P. Ciblat
{"title":"A nearly optimal resource allocation algorithm for the downlink of OFDMA 2-D networks with multicell interference","authors":"N. Ksairi, P. Bianchi, P. Ciblat","doi":"10.1109/SPAWC.2010.5671053","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671053","url":null,"abstract":"In this paper, we address the problem of power control and subcarrier assignment for the downlink of a sectorized two-dimensional (2-D) OFDMA cellular network assuming statistical Channel State Information (CSI) and fractional frequency reuse. The latter reuse scheme has been recommended for several cellular systems such as WiMAX. In this context, we provide a resource allocation algorithm with low computational complexity that can be implemented in a distributed fashion without the intervention of any central controller. The performance of this allocation scheme is analyzed assuming fast fading Rayleigh channels and Gaussian distributed multicell interference. Interestingly, it is shown that the proposed algorithm is asymptotically equivalent to an optimal resource allocation i.e., its total transmit power is equal in the limit of large numbers of users to the transmit power associated with a global solution to the joint resource allocation problem.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127398627","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
Low-complexity MIMO-BICM receivers with imperfect channel state information: Capacity-based performance comparison 具有不完全信道状态信息的低复杂度MIMO-BICM接收机:基于容量的性能比较
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670872
Clemens Novak, G. Matz
{"title":"Low-complexity MIMO-BICM receivers with imperfect channel state information: Capacity-based performance comparison","authors":"Clemens Novak, G. Matz","doi":"10.1109/SPAWC.2010.5670872","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670872","url":null,"abstract":"This paper provides a performance comparison of soft MMSE and max-log demodulators for multiple-input multiple-output (MIMO) bit-interleaved coded modulation (BICM) systems with imperfect channel state information. We use the capacity of the equivalent modulation channel as a code-independent performance metric. Our results show that the conventional approach of mismatched demodulation is noticeably inferior to optimal demodulators that are derived by conditioning on the channel estimate right from the beginning. Numerical simulations further demonstrate the importance of appropriate pilot power allocation.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124836451","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
Enhanced time-varying channel estimation based on two dimensional basis projection and self-interference suppression 基于二维基投影和自干扰抑制的增强时变信道估计
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670978
R. Carrasco-Alvarez, R. Parra-Michel, A. Orozco-Lugo
{"title":"Enhanced time-varying channel estimation based on two dimensional basis projection and self-interference suppression","authors":"R. Carrasco-Alvarez, R. Parra-Michel, A. Orozco-Lugo","doi":"10.1109/SPAWC.2010.5670978","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670978","url":null,"abstract":"Estimation of single-carrier communication channels based on superimposed training (ST) has been widely studied in the last years, because it offers a way for estimating the channel without the transmission of a pilot sequence multiplexed in time with the data, which implies a saving of valuable bandwidth. In this paper, the use of a variation of ST known as data-dependent superimposed training (DDST) in conjunction with a bi-dimensional basis expansion is proposed in order to enhance the performance of the channel estimation. For corroboration of the exposed method, simulation results are presented, where it is possible to observe a favorable performance with respect to state of art techniques.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129878716","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 carrier nulling approaches for channel shortening in OFDMA systems OFDMA系统中信道缩短的载波零化方法研究
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670878
T. Miyajima, Z. Ding
{"title":"On carrier nulling approaches for channel shortening in OFDMA systems","authors":"T. Miyajima, Z. Ding","doi":"10.1109/SPAWC.2010.5670878","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670878","url":null,"abstract":"This paper considers blind and semiblind channel shortening methods based on carrier nulling criteria to mitigate the effect of inter-block interference in uplink OFDMA systems. We derive a sufficient condition that states that if the number of subcarriers unused by a desired user exceeds a given threshold then uplink channels can be shortened perfectly. Simulation results are shown to verify the analytical result.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133860800","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
Stochastic learning algorithms for optimal design of wireless networks 无线网络优化设计的随机学习算法
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671073
Alejandro Ribeiro
{"title":"Stochastic learning algorithms for optimal design of wireless networks","authors":"Alejandro Ribeiro","doi":"10.1109/SPAWC.2010.5671073","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671073","url":null,"abstract":"We introduce algorithms to optimize wireless networks in the presence of fading. Central to the problem considered is the need to learn the fading's probability distribution while determining optimal operating points. A stochastic subgradient descent algorithm in the dual domain is developed to accomplish this task. Even though the optimization problems considered are not convex, convergence of the proposed algorithms is claimed. Numerical results using adaptive modulation over an interference limited physical layer corroborate theoretical results.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132473167","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
Stochastic signaling under second and fourth moment constraints 第二和第四矩约束下的随机信号
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671070
Cagri Goken, S. Gezici, O. Arikan
{"title":"Stochastic signaling under second and fourth moment constraints","authors":"Cagri Goken, S. Gezici, O. Arikan","doi":"10.1109/SPAWC.2010.5671070","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671070","url":null,"abstract":"Stochastic signaling is investigated under second and fourth moment constraints for the detection of scalar-valued binary signals in additive noise channels. Sufficient conditions are derived to determine when the use of stochastic signals instead of deterministic ones can or cannot enhance the error performance of a given binary communications system. Also, a convex relaxation approach is employed to obtain approximate solutions of the optimal stochastic signaling problem. Finally, numerical examples are presented, and extensions of the results to M-ary communications systems and to other criteria than the average probability of error are discussed.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114344845","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
MIMO BC/MAC MSE duality with imperfect transmitter and perfect receiver CSI MIMO BC/MAC MSE对偶，不完美的发射器和完美的接收器CSI
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670866
M. Joham, Michael Vonbun, W. Utschick
{"title":"MIMO BC/MAC MSE duality with imperfect transmitter and perfect receiver CSI","authors":"M. Joham, Michael Vonbun, W. Utschick","doi":"10.1109/SPAWC.2010.5670866","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670866","url":null,"abstract":"A mean square error (MSE) duality between the multiple-input multiple-output (MIMO) broadcast channel (BC) and the MIMO multiple access channel (MAC) is proposed,where the transmitter has partial or even only statistical knowledge of the channels and the receivers have complete channel state information (CSI). The dual MIMO MAC has transmitters with full CSI, whereas the receiver has partial CSI or only statistical channel knowledge. The duality connects the average user MSEs of the two channels conditioned on the CSI of the transmitter in the BC and can be used to solve MIMO BC average MSE problems, as is demonstrated for the special case of a MIMO BC average sum MSE minimization with a transmitter having only partial CSI.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134515991","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: 18
An energy-efficient comparison of classical detectors for CDMA code synchronization 经典CDMA码同步检测器的能效比较
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671045
G. Bacci, M. Luise
{"title":"An energy-efficient comparison of classical detectors for CDMA code synchronization","authors":"G. Bacci, M. Luise","doi":"10.1109/SPAWC.2010.5671045","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671045","url":null,"abstract":"This paper studies the performance of coherent and noncoherent code alignment detectors in the uplink of a flat-fading CDMA wireless network. A distributed resource allocation scheme in which each pair transmitter-receiver can set its own transmit power and detection threshold is considered to maximize the probability of code detection per consumed energy at the transmitter under a constraint on the maximum probability of spurious code locks. The proposed analytical framework proves that the coherent detector slightly outperforms noncoherent synchronizers in terms of energy efficiency at the Nash equilibrium, although the performance of the two classes is substantially equivalent.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123792082","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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