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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 training design and placement for channel estimation in cooperative networks 合作网络中信道估计的最优训练设计与布局
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671095
C. Mavrokefalidis, A. Rontogiannis, K. Berberidis
{"title":"Optimal training design and placement for channel estimation in cooperative networks","authors":"C. Mavrokefalidis, A. Rontogiannis, K. Berberidis","doi":"10.1109/SPAWC.2010.5671095","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671095","url":null,"abstract":"In this paper, optimal training design and placement are studied for channel estimation in a frequency selective, single relay, amplify and forward cooperative system. Using a two-phase transmission protocol, the power distribution between the phases, among the pilot tones as well as the positioning of pilot tones within the transmitted OFDM symbols are examined. The LMMSE and two variants of the LS estimator are analyzed and the optimal training design and placement strategies are derived. Closed-form expressions are derived for the minimum achievable MSE in each case, which are precisely verified through simulations.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"21 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":"114730231","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
On the fluctuations of the mutual information for non centered MIMO channels: The non Gaussian case 非中心MIMO信道互信息波动的研究:非高斯情况
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671057
A. Kammoun, M. Kharouf, W. Hachem, J. Najim, Ahmed El Kharroubi
{"title":"On the fluctuations of the mutual information for non centered MIMO channels: The non Gaussian case","authors":"A. Kammoun, M. Kharouf, W. Hachem, J. Najim, Ahmed El Kharroubi","doi":"10.1109/SPAWC.2010.5671057","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671057","url":null,"abstract":"The use of Multiple Input Multiple Output (MIMO) systems has been widely recognized as an efficient solution to increase the data rate of wireless communications. In this regard, several contributions investigate the performance improvement of MIMO systems in terms of Shannon's mutual information. In most of these contributions, elements of the MIMO channel matrix are assumed to belong to a multivariate Gaussian distribution. The non Gaussian case, which is realistic in many practical environments, has been much less studied. This contribution is devoted to the study of the mutual information of MIMO channels when the channel matrix elements are Ricean with the non-Ricean component being iid but non-Gaussian. In this context, the mutual information behavior is studied in the large dimensional regime where both channel matrix dimensions converge to infinity at the same pace. In this regime, a Central Limit Theorem on the mutual information is provided. In particular, the mutual information variance is determined in terms of the parameters of the channel statistical model. Since non Gaussian entries are allowed, a new term proportional to the fourth cumulant of their distribution arises in the expression of the asymptotic variance. In addition, a bias term proportional to this fourth order cumulant appears.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"36 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":"124759948","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
Centralized and decentralized cooperative spectrum sensing in cognitive radio networks: A novel approach 认知无线电网络中集中式和分散式协同频谱感知:一种新方法
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670998
Nima Noorshams, M. Malboubi, A. Bahai
{"title":"Centralized and decentralized cooperative spectrum sensing in cognitive radio networks: A novel approach","authors":"Nima Noorshams, M. Malboubi, A. Bahai","doi":"10.1109/SPAWC.2010.5670998","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670998","url":null,"abstract":"In this paper, the cooperative spectrum sensing is probabilistically modeled as a mixture of two Gaussian distributions and EM algorithm is applied for learning the parameters and classifying these two classes. Also, in order to exploit the dependencies of the states of the primary user in time, a Hidden Markov Model is used to improve the performance of the centralized spectrum sensing. Furthermore, a new decentralized cooperative spectrum sensing algorithm is proposed. In this case, the local information of secondary users are appropriately combined to guarantee a reliable communication. Our simulation results indicate the remarkable performance of the proposed cooperative sensing algorithms even in very low signal to noise ratios.","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":"129443597","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: 35
Evaluation of the effects of pilots on the envelope fluctuations reduction based on neural fuzzy systems 基于神经模糊系统的飞行员对包络波动抑制效果评价
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671094
Y. Jabrane, V. P. Gil Jiménez, A. García Armada, B. Ait Es Said, A. Ait Ouhman
{"title":"Evaluation of the effects of pilots on the envelope fluctuations reduction based on neural fuzzy systems","authors":"Y. Jabrane, V. P. Gil Jiménez, A. García Armada, B. Ait Es Said, A. Ait Ouhman","doi":"10.1109/SPAWC.2010.5671094","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671094","url":null,"abstract":"In this paper, a novel scheme for reducing the envelope fluctuations in OFDM (Orthogonal Frequency division Multiplexing) based on ANFIS (Adaptive Neural Fuzzy Inference Systems) is evaluated when some data can not be modified such as pilot sub-carriers. The loss on the envelope fluctuation reduction is shown to be smaller than 0.3 dB when the proportion of pilots lies into the common values in standards.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"13 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":"127524046","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
Decentralized base station assignment in combination with downlink beamforming 与下行波束形成相结合的分散基站分配
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671011
Harri Pennanen, A. Tolli, M. Latva-aho
{"title":"Decentralized base station assignment in combination with downlink beamforming","authors":"Harri Pennanen, A. Tolli, M. Latva-aho","doi":"10.1109/SPAWC.2010.5671011","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671011","url":null,"abstract":"Decentralized base station (BS) assignment methods with limited backhaul information exchange are proposed to be combined with decentralized optimal multi-cell minimum power beamforming and Zero-Forcing (ZF) beamforming techniques. The aim of the combined BS assignment and downlink beamforming is to minimize sum power while guaranteeing a minimum SINR per user. A major finding is that a simple ZF beamforming with the optimal decentralized BS assignment, and with limited backhaul information exchange obtains near optimal performance near the cell edge when the user-specific SINR targets are high. Thus, only marginal gains are available from more complex BS assignment and beamforming approaches. However, in the case of low user-specific SINR targets, there is a significant gain available at the cell edge from the optimal beamforming and BS assignment. For example, a simple maximum channel norm selection based BS assignment method with the optimal minimum power beamforming can obtain much of this gain.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"35 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":"129963173","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
Löwdin's approach for orthogonal pulses for UWB impulse radio Löwdin的方法正交脉冲UWB脉冲无线电
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670881
Philipp Walk, P. Jung, J. Timmermann
{"title":"Löwdin's approach for orthogonal pulses for UWB impulse radio","authors":"Philipp Walk, P. Jung, J. Timmermann","doi":"10.1109/SPAWC.2010.5670881","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670881","url":null,"abstract":"In this contribution we present a novel orthogonalization method for ultra-wideband (UWB) impulse radio transmission. Contrary to other work we utilize Löwdin's orthogonalization method which delivers a shift-orthogonal basis optimally close (in energy) to the initial pulse generating the shift-invariant space. We show that the shift-orthogonal basis can be well approximated using the Zak transform whenever the initial pulse fulfils certain conditions. This method can be efficiently implemented with the discrete Fourier transform. Furthermore we discuss the existence of compactly supported shift-orthogonal pulses, which are desirable for pulse position modulation.","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":"130135874","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
Characterization of SINR uncertainty due to spatial interference variation 空间干扰变化下信噪比不确定性的表征
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670896
Chia-Hao Yu, O. Tirkkonen
{"title":"Characterization of SINR uncertainty due to spatial interference variation","authors":"Chia-Hao Yu, O. Tirkkonen","doi":"10.1109/SPAWC.2010.5670896","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670896","url":null,"abstract":"We consider the SINR variation generated by the change of spatial interference pattern in a cellular communication system, which is especially severe when using adaptive array for transmission. In this paper, we derive the distribution of SINR variation at the output of Interference Rejection Combining (IRC) and Maximum Ratio Combining (MRC) receivers, assuming equal-power interferers. The analysis can be applied to evaluate a system level SINR variation. According to the results, we found that IRC shows better SINR and SINR variation properties under a narrow antenna beamwidth practical in cellular networks.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"96 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":"123766220","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
Group sparsity methods for compressive channel estimation in doubly dispersive multicarrier systems 双色散多载波系统中压缩信道估计的群稀疏性方法
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670986
Daniel Eiwen, G. Taubock, F. Hlawatsch, H. Feichtinger
{"title":"Group sparsity methods for compressive channel estimation in doubly dispersive multicarrier systems","authors":"Daniel Eiwen, G. Taubock, F. Hlawatsch, H. Feichtinger","doi":"10.1109/SPAWC.2010.5670986","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670986","url":null,"abstract":"We propose advanced compressive estimators of doubly dispersive channels within multicarrier communication systems (including classical OFDM systems). The performance of compressive channel estimation has been shown to be limited by leakage components impairing the channel's effective delay-Doppler sparsity. We demonstrate a group sparse structure of these leakage components and apply recently proposed recovery techniques for group sparse signals. We also present a basis optimization method for enhancing group sparsity. Statistical knowledge about the channel can be incorporated in the basis optimization if available. The proposed estimators outperform existing compressive estimators with respect to estimation accuracy and, in one instance, also computational complexity.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"64 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":"126384275","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: 21
Adaptive modulation for multiuser orthogonal random beamforming systems 多用户正交随机波束形成系统的自适应调制
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5670965
Chanhong Kim, Jungwoo Lee
{"title":"Adaptive modulation for multiuser orthogonal random beamforming systems","authors":"Chanhong Kim, Jungwoo Lee","doi":"10.1109/SPAWC.2010.5670965","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5670965","url":null,"abstract":"In this paper, we present and analyze a rate-adaptive multiuser orthogonal random beamforming (ORBF) system. The goal is to maximize the average spectral efficiency (ASE) while satisfying a target bit error ratio (BER) constraint. We first derive the cumulative distribution function of the post-scheduling signal-to-interference-plus-noise ratio (SINR) with a new approach. The average BER and the ASE are derived as closed-form expressions. Finally, we obtain the optimal switching SINR thresholds maximizing the ASE under average BER constraint. Simulation results show performance improvement in terms of ASE.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"20 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":"126396904","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
Extended orthogonal space-time block coding scheme for asynchronous cooperative relay networks over frequency-selective channels 频率选择信道上异步协同中继网络的扩展正交空时分组编码方案
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2010-06-20 DOI: 10.1109/SPAWC.2010.5671082
F. T. Alotaibi, J. Chambers
{"title":"Extended orthogonal space-time block coding scheme for asynchronous cooperative relay networks over frequency-selective channels","authors":"F. T. Alotaibi, J. Chambers","doi":"10.1109/SPAWC.2010.5671082","DOIUrl":"https://doi.org/10.1109/SPAWC.2010.5671082","url":null,"abstract":"In this paper, we present a new robust scheme for use in asynchronous cooperative networks over frequency-selective channels through using three and four relay nodes. Based on extended orthogonal space-time block coding (EO-STBC), we have presented a direct quantized feedback approach that can achieve full cooperative diversity and array gain with unity code rate over each hop. In this scheme, we have employed orthogonal frequency division multiplexing (OFDM) type pre-coding at the source node to combat multipath fading and timing errors from relay nodes by using cyclic prefix insertion for the broadcasted and relayed signals. To reduce the feedback overhead significantly we have proposed a quantized group feedback approach which can enhance the system performance. Simulation results show that the proposed scheme yields a significant improvement in bit error rate performance over the previous scheme that has been implemented over two relays and uses a very simple symbol-wise maximum-likelihood decoder.","PeriodicalId":436215,"journal":{"name":"2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"9 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":"126429258","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
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