A cross-layer approach to collaborative beamforming for wireless Ad Hoc networks

Lun Dong, Athina P. Petropulu, H. Vincent Poor

Research output: Contribution to journalArticle

66 Scopus citations

Abstract

Via collaborative beamforming, nodes in a wireless network are able to transmit a common message over long distances in an energy efficient fashion. However, the process of making available the same message to all collaborating nodes introduces delays. In this paper, a medium access control-physical (MAC-PHY) cross-layer scheme is proposed that enables collaborative beamforming at significantly reduced collaboration overhead. It consists of two phases. In the first phase, nodes transmit locally in a random access time-slotted fashion. Simultaneous transmissions from multiple source nodes are viewed as linear mixtures of all transmitted packets. In the second phase, a set of collaborating nodes, acting as a distributed antenna system, beamform the received analog waveform to one or more faraway destinations. This step requires multiplication of the received analog waveform by a complex weight, which is independently computed by each collaborating node, and which allows packets bound to the same destination to add coherently at the destination node. Assuming that each node has access to location information, the proposed scheme can achieve high throughput, which in certain cases exceeds one. Analyses of the average beampattern, networking performance, and symbol error probability corresponding to the proposed scheme are provided.

Original languageEnglish (US)
Pages (from-to)2981-2993
Number of pages13
JournalIEEE Transactions on Signal Processing
Volume56
Issue number7 I
DOIs
StatePublished - Jul 1 2008

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Electrical and Electronic Engineering

Keywords

  • Beamforming
  • Cooperation
  • Distributed wireless
  • Systems

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