TY - JOUR
T1 - Enhanced MRC for decode-and-forward cooperative diversity systems
AU - Nasri, Amir
AU - Schober, Robert
AU - Uysal, Murat
N1 - Funding Information:
Manuscript received June 6, 2011; revised February 28, 2012; accepted April 20, 2012. The associate editor coordinating the review of this letter and approving it for publication was C. Xiao. This work was supported in part by an NSERC Strategic Project Grant (STPGP 350451). A. Nasri and R. Schober are with the Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada (e-mail: {amirn, rschober}@ece.ubc.ca). M. Uysal is with the Faculty of Engineering, Özyeˇgin University, 34662, Istanbul, Turkey (e-mail: [email protected]). Digital Object Identifier 10.1109/TWC.2012.083112.111074
PY - 2012
Y1 - 2012
N2 - In this letter, we propose a novel enhanced maximalratio combining (EMRC) scheme for multibranch decodeandforward (DF) cooperative diversity systems consisting of a source, a destination, and multiple relays. This scheme employs adjustable parameters at the relays and the destination which enable this scheme to appropriately adapt to variations in the sourcerelay and relaydestination channel gains. For the proposed EMRC scheme, we analyze the asymptotic error rate performance for high signaltonoise ratios and Rayleigh fading. Based on the obtained analytical expressions, we find the optimal parameters that lead to minimization of the asymptotic error rate. Furthermore, we compare the error rate performance as well as the feedback overhead of EMRC with those of important DF schemes, namely, cooperative MRC (CMRC) and two DF schemes based on the link adaptive regeneration (LAR) concept, namely, LARα inst and LAR. We show that although the feedback requirements of EMRC are similar to those of LAR, EMRC achieves a performance similar to that of LARα inst, which has a substantially higher feedback overhead.
AB - In this letter, we propose a novel enhanced maximalratio combining (EMRC) scheme for multibranch decodeandforward (DF) cooperative diversity systems consisting of a source, a destination, and multiple relays. This scheme employs adjustable parameters at the relays and the destination which enable this scheme to appropriately adapt to variations in the sourcerelay and relaydestination channel gains. For the proposed EMRC scheme, we analyze the asymptotic error rate performance for high signaltonoise ratios and Rayleigh fading. Based on the obtained analytical expressions, we find the optimal parameters that lead to minimization of the asymptotic error rate. Furthermore, we compare the error rate performance as well as the feedback overhead of EMRC with those of important DF schemes, namely, cooperative MRC (CMRC) and two DF schemes based on the link adaptive regeneration (LAR) concept, namely, LARα inst and LAR. We show that although the feedback requirements of EMRC are similar to those of LAR, EMRC achieves a performance similar to that of LARα inst, which has a substantially higher feedback overhead.
KW - Cooperative diversity
KW - cooperative maximal - ratio combining
KW - decode - and - forward
KW - link adaptive regeneration
KW - performance analysis and optimization
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U2 - 10.1109/TWC.2012.083112.111074
DO - 10.1109/TWC.2012.083112.111074
M3 - Article
AN - SCOPUS:84867894490
SN - 1536-1276
VL - 11
SP - 3418
EP - 3423
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 10
M1 - 6294501
ER -