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2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications最新文献

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Matrix and tensor decompositions for identification of block-structured nonlinear channels in digital transmission systems 数字传输系统中块结构非线性信道识别的矩阵和张量分解
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641614
A. Kibangou, G. Favier
{"title":"Matrix and tensor decompositions for identification of block-structured nonlinear channels in digital transmission systems","authors":"A. Kibangou, G. Favier","doi":"10.1109/SPAWC.2008.4641614","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641614","url":null,"abstract":"In this paper, we consider the problem of identification of nonlinear communication channels using input-output measurements. The nonlinear channel is structured as a LTI-ZMNL-LTI one, i.e. a zero-memory nonlinearity (ZMNL) sandwiched between two linear time-invariant (LTI) subchannels. Considering Volterra kernels of order higher than two as tensors, we show that such a kernel associated with a LTI-ZMNL-LTI admits a PARAFAC decomposition with matrix factors in Toeplitz form. From a third-order Volterra kernel, we show that the PARAFAC decomposition allows estimating directly the linear subchannels. In the case of a LTI-ZMNL channel, such a task is achieved by considering an eigenvalue decomposition of a given slice of such a tensor. Then, the nonlinear subsystem is estimated in the least squares sense. The proposed identification method is illustrated by means of simulation results.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127230451","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
Outage probability approximation for the wiener filter SINR in MIMO systems MIMO系统中维纳滤波器信噪比的中断概率逼近
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641592
A. Kammoun, M. Kharouf, W. Hachem, J. Najim
{"title":"Outage probability approximation for the wiener filter SINR in MIMO systems","authors":"A. Kammoun, M. Kharouf, W. Hachem, J. Najim","doi":"10.1109/SPAWC.2008.4641592","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641592","url":null,"abstract":"This paper studies the fluctuations of the post-processing SNR at the output of the linear MMSE receiver in (receive) correlated multiple input multiple output (MIMO) systems. Although it is known that asymptotically, the SNR behaves like a Gaussian random variable, this approximation may yield to inaccurate estimates for small dimension. In order to circumvent this, we use gamma and generalized gamma distributions to approximate the probability distribution of the SINR. The first three asymptotic moments of the SNR are computed and are used to adjust gamma and generalized gamma distributions and to accurately approximate the bit error rate (BER) and its outage probability. We provide simulations which strongly support the gamma approximation, even for a small number of emitting/receive antennas.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123838083","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
Low complexity BICM demodulation for MIMO transmission 用于MIMO传输的低复杂度BICM解调
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641637
Rizwan Ghaffar, R. Knopp
{"title":"Low complexity BICM demodulation for MIMO transmission","authors":"Rizwan Ghaffar, R. Knopp","doi":"10.1109/SPAWC.2008.4641637","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641637","url":null,"abstract":"In this paper we deliberate on channel coding for spatial data streams and focus on their equal-rate non-uniform power distribution in successive interference cancellation (SIC) detection algorithm. We focus on high spectral efficiency bit interleaved coded modulation (BICM) MIMO OFDM system where, after serial to parallel conversion, per antenna coding and antenna cycling, spatial data streams are simultaneously transmitted by using an antenna array. The reception is based on SIC detection algorithm. Standard receiver solutions for such schemes employ minimum mean square error (MMSE) successive stripping decoders. Application of MMSE filters combined with the Gaussian assumption of post detection interference institutes sub-optimality in the metrics and furthermore these equalizers are intricate in computation. We propose a novel near optimal demodulator based on match filter outputs for a 2 times 2 system which reduces the sub optimality of the metric resulting in an improved performance and a significant reduction in computational complexity with respect to the MMSE based solutions. We further extend the idea to higher-dimensional MIMO systems showing that there is a slight degradation in the performance with increase in dimensionality of the system but is concurrently coupled with a boost in complexity savings.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"58 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126764435","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
Asymptotically optimal block-based transceivers with reduced redundancy 减少冗余的渐近最优基于块的收发器
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641599
L. Vega, C. Galarza
{"title":"Asymptotically optimal block-based transceivers with reduced redundancy","authors":"L. Vega, C. Galarza","doi":"10.1109/SPAWC.2008.4641599","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641599","url":null,"abstract":"We present the structure of a transceiver for a frequency selective channel that allows the introduction of reduced redundancy. The problem of finding the transceiver that optimizes the information rate is a difficult non-linear optimization problem. For that reason we present a simple algorithmic procedure in order to obtain suboptimal solutions. We also show that the structure proposed approaches capacity when the data block length gets large. We present simulation results that show that the proposed design outperforms other existing ones in the literature.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"247 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113966981","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
Channel estimation in MIMO OFDM/OQAM MIMO OFDM/OQAM中的信道估计
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641611
Jean-Philippe Javaudin, Yiqi Jiang
{"title":"Channel estimation in MIMO OFDM/OQAM","authors":"Jean-Philippe Javaudin, Yiqi Jiang","doi":"10.1109/SPAWC.2008.4641611","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641611","url":null,"abstract":"Multi-carrier modulations such as orthogonal frequency division multiplexing (OFDM) are widely used in radio transmission systems. Among these modulations, OFDM/OQAM is an interesting alternative to the conventional cyclic-prefix, OFDM (CP-OFDM) modulation, as it does not require the use of any guard interval. This specificity allows a better spectral efficiency. In this paper we investigate on channel estimation for OFDM/OQAM modulations in the case of multiple-input multiple-output (MIMO) transmissions over radio channels. We focus on a two transmit antenna spatial data multiplexing (SDM) scheme and on the use of scattered pilots for the channel estimation. We propose a MIMO channel estimation method that copes with the intrinsic interference inherent to OFDM/OQAM and we compare this method to ideal channel estimation methods proposed in previous studies.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114483939","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: 19
On avoiding collisions and promoting cooperation: Catching two birds with one stone 论避免碰撞促进合作:一石二鸟
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641644
F. Verde, T. Korakis, E. Erkip, A. Scaglione
{"title":"On avoiding collisions and promoting cooperation: Catching two birds with one stone","authors":"F. Verde, T. Korakis, E. Erkip, A. Scaglione","doi":"10.1109/SPAWC.2008.4641644","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641644","url":null,"abstract":"A cross-layer approach, called CoopMAC, has been proposed recently to integrate cooperation at the physical layer with the medium access control sublayer, thereby achieving substantial throughput and delay performance improvements. CoopMAC capitalizes on the broadcast nature of wireless channels, recruiting a relay opportunistically and on the fly to support the communication of a particular source-destination pair. Herein, we study a cross-layer framework that uses randomized cooperative coding, and allows the simultaneous recruitment of multiple relays which collectively act as the antennas of a distributed transmission array, by simply randomizing the antenna code selection rule. We show that randomized cooperation not only alleviates the burden associated with the relay selection process, but also fully exploits the available spatial diversity.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115355250","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
Decoupled root-MUSIC algorithm for Multidimensional Harmonic retrieval 解耦根music算法的多维谐波检索
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641561
R. Boyer
{"title":"Decoupled root-MUSIC algorithm for Multidimensional Harmonic retrieval","authors":"R. Boyer","doi":"10.1109/SPAWC.2008.4641561","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641561","url":null,"abstract":"In this paper, we propose a decoupled root-MUSIC algorithm adapted to the multidimensional harmonic model, which is widely used in MIMO channel sounding. The optimization criterion of the proposed algorithm is based on multidimensional orthogonal condition testings between a tensor steering manifold parameterized by the parameters of interest and a set of orthogonal projectors associated with each dimension. This criterion can be viewed as a set of decoupled estimation subproblems and allows the use of fast polynomial rooting techniques. In consequence, the proposed algorithm is highly scalable, parallelizable and avoids costly enumerative-based search. However, decoupling property implies to correctly pair the estimated model parameters. So, we propose a fast automatic pairing procedure based on the exploitation of the Vandermonde-structure preserving property of the alternating least squares candecomp/parafac (ALS-CP) algorithm. In addition, we study in a first time the case of a single snapshot and we generalize our algorithm to the multiple snapshots scenario. Finally, by means of numerical simulations, we show that the proposed scheme is efficient for one order of magnitude less complex than other standard algorithms.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124791205","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: 14
Robust header recovery based enhanced permeable protocol layer mechanism 基于增强可渗透协议层机制的健壮报头恢复
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641576
Cédric Marin, Yann Leprovost, Michel Kieffer, Pierre Duhamel
{"title":"Robust header recovery based enhanced permeable protocol layer mechanism","authors":"Cédric Marin, Yann Leprovost, Michel Kieffer, Pierre Duhamel","doi":"10.1109/SPAWC.2008.4641576","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641576","url":null,"abstract":"This paper presents an enhanced permeable layer mechanism useful for reliable packetized multimedia transmission. Packet header recovery at various protocol layers using MAP estimation is the cornerstone of the proposed solution. The available intra-layer and inter-layer header correlation is used to define a reduced set of header configurations for further processing. The best candidate is then obtained through soft decoding based on CRC redundancy. Simulation results for a WiFi transmission scheme using DBPSK modulated signals over an AWGN channel show a substantial (4 to 12 dB) link budget improvement. A sub-optimal and hardware realizable version of the proposed algorithm is also presented.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125293522","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: 14
Optimum scheduling for orthogonal multiple access over fading channels using quantized channel state information 基于量化信道状态信息的衰落信道正交多址优化调度
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641631
A. Marques, G. Giannakis, F. J. Ramos
{"title":"Optimum scheduling for orthogonal multiple access over fading channels using quantized channel state information","authors":"A. Marques, G. Giannakis, F. J. Ramos","doi":"10.1109/SPAWC.2008.4641631","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641631","url":null,"abstract":"The efficiency of multi-access communications over wireless fading links benefits from channel-adaptive allocation of the available bandwidth and power resources. Different from most existing approaches that allocate resources based on perfect channel state information (P-CSI), this work optimizes channel scheduling and resource allocation over orthogonal fading channels when user terminals and the scheduler rely on quantized channel state information (Q-CSI). The novel unifying approach optimizes an average transmit-performance criterion subject to average quality of service requirements. The resultant optimal policy per fading realization either allocates the entire channel to a single (winner) user, or, to a small group of winner users whose percentage of shared resources is found by solving a linear program. Both alternatives become possible by smoothing the allocation scheme. The smooth policy is asymptotically optimal and incurs reduced computational complexity.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130704803","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
Dynamic spectrum access with non-stationary Multi-Armed Bandit 非平稳多臂强盗的动态频谱接入
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641641
Ben Hadj Alaya-Feki, É. Moulines, Alain LeCornec
{"title":"Dynamic spectrum access with non-stationary Multi-Armed Bandit","authors":"Ben Hadj Alaya-Feki, É. Moulines, Alain LeCornec","doi":"10.1109/SPAWC.2008.4641641","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641641","url":null,"abstract":"Dynamic spectrum access (DSA) is an emerging notion in cognitive radio, aiming to improve the spectrum usage with reliable secondary access to the spectral resources. The main challenge in DSA is the detection of spectral opportunities and their efficient utilization without causing interference to the primary users. For this goal, we propose to make use of a reinforcement learning approach: the Multi Armed Bandit (MAB). The MAB approach provides the secondary users with the rules and policies necessary to achieve a tradeoff between exploitation and exploration in DSA. Different MAB strategies are tested on an IEEE802.11 medium access model and evaluated in dynamic environment. Our study shows that the MAB constitute a viable solution for the DSA. Adding to that, the performances of the MAB algorithms can be improved with a finite tuning of the internal parameters.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132882887","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: 25
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