標題: Design of Low-Overhead Cooperative Beamforming for Information Relaying in Wireless Sensor Networks Under Imperfect Quantized SNR of Source-to-Relay Links
作者: Wu, Jwo-Yuh
Hu, Chung-Hsuan
Wang, Tsang-Yi
Tsai, Shang-Ho
電機資訊學士班
Undergraduate Honors Program of Electrical Engineering and Computer Science
關鍵字: Amplify and forward;beamforming;cooperative communications;overhead reduction;quantization;relay
公開日期: 1-三月-2013
摘要: We consider a wireless sensor network employing cooperative beamforming for information relaying. To reduce the signaling overhead, each relay node quantizes the SNR of the source-to-relay (S-R) link into one bit, which is then transmitted through a binary symmetric channel (BSC) with a known crossover probability to the destination. Given the set of the error-corrupted one-bit messages received at the destination, the beamforming design criterion is the maximization of the expected receive SNR, averaged over the conditional bit-flipping distributions of BSCs. We derive an analytic expression for the considered SNR metric, which is a complicated function of the beamforming weights. To facilitate analysis, we further derive a tractable lower bound for the conditional average SNR. By conducting maximization with respect to this lower bound, a closed-form sub-optimal beamformer can be obtained as a solution to a generalized eigenvalue problem. Computer simulations are used to illustrate the performance of the proposed scheme.
URI: http://dx.doi.org/10.1109/TSP.2013.2238932
http://hdl.handle.net/11536/21417
ISSN: 1053-587X
DOI: 10.1109/TSP.2013.2238932
期刊: IEEE TRANSACTIONS ON SIGNAL PROCESSING
Volume: 61
Issue: 6
起始頁: 1368
結束頁: 1374
顯示於類別:期刊論文


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  1. 000315965500006.pdf