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

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The optimal power-allocation for OFDMA regenerative relaying downlink systems OFDMA再生中继下行系统的最佳功率分配
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641666
R. Kwak, J. Cioffi
{"title":"The optimal power-allocation for OFDMA regenerative relaying downlink systems","authors":"R. Kwak, J. Cioffi","doi":"10.1109/SPAWC.2008.4641666","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641666","url":null,"abstract":"This paper develops the optimal power-allocation algorithm to maximize the sum-rate in orthogonal frequency-division multiple-access (OFDMA) regenerative relaying downlink systems with separate power constraints. The optimal algorithm is based on the Lagrange dual-decomposition method when subchannels are pre-assigned to users and relay stations (RS). This paper also proposes a heuristic algorithm, which performance is exactly the same as that of the optimal algorithm in almost all cases. The simulation results show that OFDMA relaying systems with proposed algorithms outperform the systems without the algorithms by more than 250% and outperform OFDMA systems without RSs by more than 45% when the power of a base station and the power of RSs are optimally adjusted.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"58 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":"125874754","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 state-space approach to semi-blind signal detection in fast frequency-selective fading MIMO channels 快速选频衰落MIMO信道半盲信号检测的状态空间方法
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641613
M. Loiola, R. R. Lopes
{"title":"A state-space approach to semi-blind signal detection in fast frequency-selective fading MIMO channels","authors":"M. Loiola, R. R. Lopes","doi":"10.1109/SPAWC.2008.4641613","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641613","url":null,"abstract":"In this paper, we propose a semi-blind state-space based receiver that jointly performs channel estimation and data detection in MIMO systems subject to fast frequency-selective fading. To accomplish these two tasks, we first define state equations representing the dynamics of channel and transmitted signals. Then, we obtain the state vector by concatenating the transmitted signals and the channel coefficients. This choice of state vector leads to a nonlinear observation equation and hence to the use of the extended Kalman filter (EKF) to estimate the states variables. We then develop the EKF and show that the proposed receiver is a generalization of many similar receivers for SISO channels. We also develop a reduced complexity version of the proposed algorithm. Simulation results show the performance gains of the proposed receiver when compared to other commonly used receivers.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"23 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":"125937434","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
Efficient 3D space time space block code for future terrestrial digital TV 面向未来地面数字电视的高效三维时空块码
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641639
Y. Nasser, J. Hélard, M. Crussiére, O. Pasquero
{"title":"Efficient 3D space time space block code for future terrestrial digital TV","authors":"Y. Nasser, J. Hélard, M. Crussiére, O. Pasquero","doi":"10.1109/SPAWC.2008.4641639","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641639","url":null,"abstract":"This article introduces a 3D space-time-space block code for future terrestrial digital TV in single frequency networks. The proposed 3D code is based on a double layer structure designed for inter-cell and intra-cell space time coded transmissions. We show that this new structure is particularly efficient for SFN environments regardless of the location of the receiver. It is then suitable for fixed, portable and mobile receptions.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"18 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":"122175070","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
A new blind channel shortening for differential encoded OFDM system 差分编码OFDM系统中一种新的盲信道缩短方法
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641664
T. Ben Jabeur, K. Abed-Meraim, H. Boujemaa
{"title":"A new blind channel shortening for differential encoded OFDM system","authors":"T. Ben Jabeur, K. Abed-Meraim, H. Boujemaa","doi":"10.1109/SPAWC.2008.4641664","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641664","url":null,"abstract":"In OFDM systems, the inter-symbol interference and inter-block interference are eliminated by using null-tones (NT) and cyclic prefix (CP) redundancy of length higher than the channel size. To preserve a high bit rate, channel shortening method is required to reduce the redundancy. Recently, channel shortening technique with differential encoded OFDM systems without the NT was introduced. This technique is very simple and achieves the channel shortening using only one symbol (the first emitted symbol). In this paper, we prove that, in the presence of null-tones (used in most OFDM-based communication standards), the performance of the previous technique decreases. Therefore, we propose an alternative solution that improves the receiverpsilas performance and preserves a high BER (Bit Error Rate) quality in presence of null-tones.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"109 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":"126765111","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
Fair service provision in OFDMA with partial channel-state information OFDMA中具有部分信道状态信息的公平业务提供
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641579
A. Alsawah, I. Fijalkow
{"title":"Fair service provision in OFDMA with partial channel-state information","authors":"A. Alsawah, I. Fijalkow","doi":"10.1109/SPAWC.2008.4641579","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641579","url":null,"abstract":"We address the problem of resource allocation on an OFDMA downlink under fairness constraints with limited channel state information (CSI). Target QoS corresponds to a minimum user data rate, a target bit-error rate and a maximum outage probability. The only available CSI is the channel average gain of each user. This partial CSI can be viewed as a shadowed pathloss that yields a modified user distribution on which resource allocation is based. Under these constraints, we provide the optimal resource allocation that maximizes the user rate. Compared to full-CSI-based allocation schemes, our solution offers a significant complexity and feedback reduction as well as a good robustness to CSI estimation errors.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"64 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":"129406391","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
NDA SNR estimation for 32APSK in AWGN AWGN中32APSK的NDA信噪比估计
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641624
A. Das, J. Ng
{"title":"NDA SNR estimation for 32APSK in AWGN","authors":"A. Das, J. Ng","doi":"10.1109/SPAWC.2008.4641624","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641624","url":null,"abstract":"32-amplitude and phase-shift-keying (32APSK) is one of the modulation schemes proposed in the 2nd generation digital video broadcasting over satellite (DVB-S2) standard. This paper presents a non-data-aided (NDA) SNR estimation scheme for 32APSK using the expectation-maximization (EM) algorithm. Two variants of the EM algorithm are presented, first with an arbitrary initialization and a second version that is initialized by modifying an existing (sub-optimal) SNR estimation technique. We demonstrate a significantly faster convergence with the latter form of initialization. We compare the performance of this estimator to the Cramer-Rao lower bound (CRLB) of NDA SNR estimation and show that the estimator performs very close to the CRLB over all SNRs of practical interest even for block sizes of 100 symbols. The estimator has also been implemented on FPGAs and we show that the fixed point implementation also performs very close to the theoretical limit.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"9 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":"132996094","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
Fluctuations of the SNR at the wiener filter output for large dimensional signals 维纳滤波器输出大维信号时信噪比的波动
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641676
A. Kammoun, M. Kharouf, W. Hachem, J. Najim
{"title":"Fluctuations of the SNR at the wiener filter output for large dimensional signals","authors":"A. Kammoun, M. Kharouf, W. Hachem, J. Najim","doi":"10.1109/SPAWC.2008.4641676","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641676","url":null,"abstract":"Consider the linear Wiener receiver for multidimensional signals. Such a receiver is frequently encountered in wireless communications and in array processing, and the Signal to noise ratio (SNR) at its output is a popular performance index. The SNR can be modeled as a random quadratic form and in order to study this quadratic form, one can rely on well-know results in Random Matrix Theory, if one assumes that the dimension of the received and transmitted signals go to infinity, their ratio remaining constant. In this paper, we study the asymptotic behavior of the SNR for a large class of multidimensional signals (MIMO, CDMA, MC-CDMA transmissions). More precisely, we provide a deterministic approximation of the SNR, that depends on the system parameters; furthermore, the fluctuations of the SNR around this deterministic approximation are shown to be Gaussian, with variance decreasing as 1/K, where K is the dimension of the transmitted signal.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"48 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":"133228552","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
A coded bit-loading linear precoded discrete multitone solution for power line communication 用于电力线通信的编码位加载线性预编码离散多音解决方案
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641669
F. Muhammad, J. Baudais, J. Hélard, M. Crussiére
{"title":"A coded bit-loading linear precoded discrete multitone solution for power line communication","authors":"F. Muhammad, J. Baudais, J. Hélard, M. Crussiére","doi":"10.1109/SPAWC.2008.4641669","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641669","url":null,"abstract":"Linear precoded discrete multitone modulation (LP-DMT) system has been already proved advantageous with adaptive resource allocation algorithm in a power line communication (PLC) context. In this paper, we investigate the bit and energy allocation algorithm of an adaptive LP-DMT system taking into account the channel coding scheme. A coded adaptive LP-DMT system is presented in the PLC context with a loading algorithm which accommodates the channel coding gains in bit and energy calculations. The performance of a concatenated channel coding scheme, consisting of an inner Weipsilas 4-dimensional 16-states trellis code and an outer Reed-Solomon code, in combination with the proposed algorithm is analyzed. Simulation results are presented for a fixed target bit error rate in a multicarrier scenario under power spectral density constraint. Using a multipath model of PLC channel, it is shown that the proposed coded adaptive LP-DMT system performs better than classical coded discrete multitone.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"97 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":"117298593","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
Semi-blind data-selective equalizers for QAM QAM的半盲数据选择均衡器
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641658
W. Martins, Markus V. S. Lima, P. Diniz
{"title":"Semi-blind data-selective equalizers for QAM","authors":"W. Martins, Markus V. S. Lima, P. Diniz","doi":"10.1109/SPAWC.2008.4641658","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641658","url":null,"abstract":"This paper proposes a new semi-blind data-selective affine-projection algorithm for channel equalization considering that the transmitted symbols belong to an M-QAM constellation. The main novelties of this algorithm are the combination of the affine-projection (AP) and set-membership (SM) concepts with the formulation of an error measure that is related to a square region (in the complex plane) centered at an element of the constellation. Simulations show that the proposed algorithm tracks slow channel variations as fast as a supervised algorithm, requiring less updates and keeping good BER performance.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"19 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":"127611281","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: 11
Transmit outage precodingwith imperfect channel state information under an instantaneous power constraint 在瞬时功率约束下，具有不完全信道状态信息的传输中断预编码
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641571
J. Maurer, J. Jaldén, G. Matz
{"title":"Transmit outage precodingwith imperfect channel state information under an instantaneous power constraint","authors":"J. Maurer, J. Jaldén, G. Matz","doi":"10.1109/SPAWC.2008.4641571","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641571","url":null,"abstract":"In this paper, we consider a multiple antenna broadcast scenario with multiple non-cooperative users under the assumption of imperfect channel state information. Under an instantaneous transmit power constraint, vector perturbation precoding requires that the users be continuously informed about the adaptive power scaling factor used at the transmit side. To overcome this limitation, we propose a new precoding scheme that uses a fixed power scaling and avoids transmitting when the available power is not sufficient to perform channel equalization at the transmit side, an event referred to as outage. We present a performance analysis and optimization of this scheme and provide numerical comparisons with classical vector perturbation.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"51 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":"115979183","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: 6
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