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2011 International ITG Workshop on Smart Antennas最新文献

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Multiple feedback successive interference cancellation with iterative decoding for point-to-point MIMO systems 点对点MIMO系统的多反馈逐次干扰消除与迭代译码
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741926
Peng Li, R. D. Lamare, Rui Fa
{"title":"Multiple feedback successive interference cancellation with iterative decoding for point-to-point MIMO systems","authors":"Peng Li, R. D. Lamare, Rui Fa","doi":"10.1109/WSA.2011.5741926","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741926","url":null,"abstract":"We investigate successive interference cancellation (SIC) detectors that can achieve a close to optimum BER performance in spatial multiplexed multi-input multi-output (SM-MIMO) systems. We propose a low-complexity interference suppression strategy, in which an enhanced SIC is devised by introducing the feedback diversity to combat the error propagation in decision feedback loops. In order to constrain the complexity introduced by the multiple feedback (MF) processing, a strategy called shadow area constraint (SAC) is developed to save the additional complexity by avoiding redundant MF processing with reliable decisions. Based on the MF and SAC algorithms, in this paper, we derive a MF aided soft-input soft-output SIC detector for iterative (turbo) MIMO systems, the feedback diversity is introduced in the detection procedure of each spatial layer to compute the extrinsic information of the coded bits. The simulations performed on an iterative detection and decoding (IDD) scheme over frequency flat fading channels demonstrate that the proposed scheme significantly outperforms the conventional SIC schemes with low computational effort.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127664967","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
Resource allocation in rate-limited OFDMA Systems: A hybrid heuristic approach 速率受限OFDMA系统中的资源分配:一种混合启发式方法
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741947
J. Ser, Miren Nekane Bilbao, S. Gil-Lopez, M. Matinmikko, S. Salcedo-Sanz
{"title":"Resource allocation in rate-limited OFDMA Systems: A hybrid heuristic approach","authors":"J. Ser, Miren Nekane Bilbao, S. Gil-Lopez, M. Matinmikko, S. Salcedo-Sanz","doi":"10.1109/WSA.2011.5741947","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741947","url":null,"abstract":"This paper presents a novel resource allocation procedure for OFDMA downlinks, which stems from an hybridization of the Harmony Search and the Differential Evolution heuristic algorithms. In this setup it is known that optimum subcarrier and power allocation is achieved through 1) assigning each subcarrier to the user with highest channel gain at the given frequency, and 2) a Water-Filling procedure over the set of considered channel gains. This work addresses the scenario where stringent rate constraints are imposed for each user at the transmitter, scenario where the previous optimum resource allocation procedure no longer holds. The proposed iterative technique hinges on the aforementioned combinatorial heuristics, jointly with an iterative greedy subcarrier shifting procedure that accounts for the fulfillment of the established rate restrictions. Preliminary simulation results are provided for the extended vehicular ITU channel model, which shed light on the performance of the proposed allocation procedure.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130589427","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
Performance analysis of Link Adaptation in LTE systems LTE系统中链路自适应性能分析
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741922
Tao Tao, A. Czylwik
{"title":"Performance analysis of Link Adaptation in LTE systems","authors":"Tao Tao, A. Czylwik","doi":"10.1109/WSA.2011.5741922","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741922","url":null,"abstract":"In this paper we focus on finding a suitable Link Adaptation (LA) algorithm which is implemented as Channel Quality Indicator (CQI) selection technique in the 3GPP Long Term Evolution (LTE) system. The potential of Link Adaptation in the LTE system is not fully exploited. Therefore in our study, we compare the performances from different LA algorithms in the LTE system. The presented LA algorithms are EESM, RawBER and MMIB which utilize the post processing SINRs (Signal-to-Interference-and-Noise power Ratio) to compute the effective SNR (Signal-to-Noise power Ratio), uncoded bit error probability and mutual information as mapping function, respectively. We present our simulation results and show that the EESM algorithm can significantly improve the performance of the whole system both in the SISO case and the MIMO case.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130573556","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: 28
Eigenbeam transmission over line-of-sight MIMO channels for fixed microwave links 固定微波链路视距MIMO信道上的特征波束传输
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741915
C. Mecklenbräuker, M. Matthaiou, M. Viberg
{"title":"Eigenbeam transmission over line-of-sight MIMO channels for fixed microwave links","authors":"C. Mecklenbräuker, M. Matthaiou, M. Viberg","doi":"10.1109/WSA.2011.5741915","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741915","url":null,"abstract":"We propose and analyze eigenbeam transmission over line-of-sight (LOS) multiple-input multiple-output (MIMO) channels with linear reception. In particular, we consider fixed point-to-point microwave links for which the singular value decomposition of the LOS MIMO channel matrix is analytically derived. We demonstrate that the Tx eigenbeams can be defined without channel state information at the transmitter and that the beams admit an insightful physical interpretation. We also evaluate the performance of a lattice-reduction aided linear receiver through numerical simulations.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133575546","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
Widely linear adaptive beamforming algorithm based on the conjugate gradient method 基于共轭梯度法的宽线性自适应波束形成算法
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741912
Jens Steinwandt, R. D. Lamare, Lei Wang, Nuan Song, M. Haardt
{"title":"Widely linear adaptive beamforming algorithm based on the conjugate gradient method","authors":"Jens Steinwandt, R. D. Lamare, Lei Wang, Nuan Song, M. Haardt","doi":"10.1109/WSA.2011.5741912","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741912","url":null,"abstract":"A new widely linear (WL) adaptive beamforming algorithm for non-circular sources based on the conjugate gradient (CG) method is proposed, which we refer to as the widely linear conjugate gradient (WL-CG) algorithm. It is designed according to the widely linearly constrained minimum variance (WL-CMV) criterion and takes full advantage of the second-order statistics of the non-circular data. Since only the knowledge of the steering vector of the desired user is necessary, the proposed method is non-data-aided. The CG method is a powerful algorithm used to design an adaptive beamformer and has an attractive trade-off between performance and complexity. Simulation results show that the proposed WL-CG algorithm provides an excellent performance, while requiring a low complexity compared to existing widely linear beamforming techniques.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114706444","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: 12
On the resolution of The LASSO-based DOA estimation method 基于lasso的DOA估计方法的求解
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741938
Ashkan Panahi, M. Viberg
{"title":"On the resolution of The LASSO-based DOA estimation method","authors":"Ashkan Panahi, M. Viberg","doi":"10.1109/WSA.2011.5741938","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741938","url":null,"abstract":"This paper investigates the consistency of the LASSO-based DOA estimation of the narrow-band signals in infinitely high SNR. Such a method provides a robust and accurate approximation of the Maximum Likelihood estimation. However, as we show, unlike the standard techniques such as subspace methods the LASSO-based estimation is generally not consistent in high SNRs. In return, considering the true DOA's, we show that the method is consistent for certain configuration of the sources. This approach leads us to relate such a conditional consistency to the resolution concept. We next give a condition to verify the consistency of a given set of directions and simplify it to a computationally fast equivalent algorithm. The results show that the resolution in infinitely high SNR case for m sensors decreases by speed 1 over m.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126783055","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
Combined semi-definite relaxation and sphere decoding method for multiple antennas systems 多天线系统的半定松弛和球面译码联合方法
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741919
Z. Shao, S. Cheung, T. Yuk
{"title":"Combined semi-definite relaxation and sphere decoding method for multiple antennas systems","authors":"Z. Shao, S. Cheung, T. Yuk","doi":"10.1109/WSA.2011.5741919","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741919","url":null,"abstract":"In this paper, a new detection method which combines the semi-definite programming relaxation (SDR) with the sphere decoding (SD) is proposed for 256-QAM multiple-input multiple-output (MIMO) system. In this method, the SDR algorithms are engaged to obtain a primary result. Then, a hyper-sphere is constructed which is centered at the received signal and has its radius equals to the Euclidean distance between the primary result and the received signal. Finally, the SD searching strategy is employed to determine the final result which satisfies the principle of maximum likelihood. Simulation results show that the proposed method can offer optimum BLER performance as well as lower computational complexity than the conventional SD detectors.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121242927","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
Spectrum sensing for cognitive radio architectures based on sub-Nyquist sampling schemes 基于子奈奎斯特采样方案的认知无线电架构频谱感知
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741936
V. Pohl, F. Y. Suratman, A. Zoubir, H. Boche
{"title":"Spectrum sensing for cognitive radio architectures based on sub-Nyquist sampling schemes","authors":"V. Pohl, F. Y. Suratman, A. Zoubir, H. Boche","doi":"10.1109/WSA.2011.5741936","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741936","url":null,"abstract":"This paper investigates a signal processing architecture for cognitive radio based on a sub-Nyquist sampling of the wideband signal. Then spectrum scanning is performed by applying an adaptive digital filter to scan the bands which might be used for cognitive radio. In particular, the paper studies detectors which are tailored for the applied signal processing scheme and which takes into account the noise correlation, introduced by the digital scanning filter.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130394014","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
Low-complexity robust beamforming based on conjugate gradient techniques 基于共轭梯度技术的低复杂度鲁棒波束形成
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741917
L. Landau, R. D. Lamare, Lei Wang, M. Haardt
{"title":"Low-complexity robust beamforming based on conjugate gradient techniques","authors":"L. Landau, R. D. Lamare, Lei Wang, M. Haardt","doi":"10.1109/WSA.2011.5741917","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741917","url":null,"abstract":"We propose low-complexity robust beamforming algorithms based on the conjugate gradient method and the worst-case optimization based criterion. Unlike the existing robust beamformers based on the worst-case optimization based criterion that use a second-order cone program, the proposed algorithms employ a joint optimization strategy based on low-complexity conjugate gradient algorithms. The proposed algorithms are termed the Robust Constrained Minimum Variance Modified Conjugate Gradient (Robust-CMV-MCG) and the Robust Constrained Constant Modulus Modified Conjugate Gradient (Robust-CCM-MCG), which has an advantage for the special case of constant modulus signals. Simulations show that the performances of the proposed algorithms are equivalent or better than that of existing robust algorithms, whereas the complexity is more than an order of magnitude lower.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114551396","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
Coordinated beamforming for MIMO interference relay channel with multiple stream transmission 多流传输MIMO干扰中继信道的协调波束形成
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741908
Jianhui Li, A. Sezgin, M. Haardt
{"title":"Coordinated beamforming for MIMO interference relay channel with multiple stream transmission","authors":"Jianhui Li, A. Sezgin, M. Haardt","doi":"10.1109/WSA.2011.5741908","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741908","url":null,"abstract":"In this paper, we propose a precoding algorithm called flexible coordinated beamforming for the MIMO interference relay channel (IRC-FlexCoBF), where two base stations equipped with multiple antennas transmit to two user terminals simultaneously with the assistance of an amplify-and-forward relay that also has multiple antennas. The case of multiple data stream transmission is considered. The relay amplification matrix is predetermined so that the interference relay channel is converted to the conventional interference channel. Then two precoders supporting multiple stream transmission in the interference channel are applied and compared. Simulation results show that the IRC-FlexCoBF algorithm achieves a higher sum rate than the stream control method. Furthermore, a higher robustness of the IRC-FlexCoBF algorithm to inter-user interference is demonstrated. Finally, the gain in sum rate confirms the advantage of cooperatively sharing a relay compared to the case where the relay is accessed exclusively by two transceiver pairs operating in a time-division-multiple-access (TDMA) mode.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134478367","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
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