Collaborative beamforming enables nodes in a wireless network to transmit acommon message over long distances in an energy efficient fashion. However, theprocess of making available the same message to all collaborating nodesintroduces delays. The authors recently proposed a MAC-PHY cross-layer schemethat enables collaborative beamforming with significantly reduced collaborationoverhead. The method requires knowledge of node locations and internode channelcoefficients. In this paper, the performance of that approach is studiedanalytically in terms of average beampattern and symbol error probability (SEP)under realistic conditions, i.e., when imperfect channel estimates are used andwhen there are phase errors in the contributions of the collaborating nodes atthe receiver.
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