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 |