Zero-Feedback,Collaborative Beamforming for Emergency Radio: Asymptotic Analysis |
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Authors: | Aggelos Bletsas Andy Lippman John N Sahalos |
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Affiliation: | (1) Telecom Lab, ECE Department, Technical University of Crete, Chania, 73100, Greece;(2) MIT Media Lab, Cambridge, MA 02139, USA;(3) Radiocommunications Lab, Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece |
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Abstract: | Collaborative beamforming among a set of distributed terminals is studied, assuming a) no specialized RF hardware for carrier
frequency synchronization, and b) zero feedback from destination (either in the form of pilot signals or explicit messages).
Our goal is to provide a solution for conventional radios (not necessarily wideband), when the link between a single source
transmitter and destination is too weak, so that no signal can be reliably received at the destination. In such critical case,
zero feedback messages from destination to the multiple transmitters cannot be assumed, even when the destination is equipped
with powerful hardware. A solution is provided for conventional radios in relevant critical applications, such as in emergency radio. The proposed scheme simply exploits lack of synchronization among distributed carriers, operating at the same nominal carrier frequency. It is shown that such beamforming is possible and its performance is analytically quantified. Results
include asymptotic analysis for the case of large number of transmitters. |
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Keywords: | |
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