Incremental Relaying, Fresh Signal Makes Better Decision

Luu Quoc TIN
Hyung Yun KONG

IEICE TRANSACTIONS on Communications   Vol.E91-B    No.7    pp.2422-2425
Publication Date: 2008/07/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.7.2422
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
cooperative communication,  Rayleigh fading,  incremental relaying,  ARQ,  

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In terms of outage behavior, it has been shown that incremental relaying achieves the best performance among cooperative diversity protocols such as: Amplify-And-Forward (AF), Decode-And-Forward (DF), and Selection Decode-And-Forward (SDF). Exploiting a limited feedback from the destination, incremental relaying lets the relay forward the signal received from the source whenever an error happens at the destination, then, the signals from both the source and the relay are combined to make a decision. Noticing that the signal from the source, indicated by the error, is detrimental, we propose a new scheme not using that signal but only making a decision based on the fresh signal from the relay. Large performance improvement and complexity reduction are attained as we show in the analysis and simulation results. Theoretical results are derived and shown to match with the simulation counterparts.