Design of low-overhead cooperative beamforming for information relaying in wireless sensor networks under imperfect quantized SNR of source-to-relay links

Jwo-Yuh Wu, Chung Hsuan Hu, Tsang Yi Wang, Shang-Ho Tsai

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article number6409475
Pages (from-to)1368-1374
Number of pages7
JournalIEEE Transactions on Signal Processing
Volume61
Issue number6
DOIs
StatePublished - 28 Jun 2013

Keywords

  • Amplify and forward
  • beamforming
  • cooperative communications
  • overhead reduction
  • quantization
  • relay

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