DocumentCode :
108808
Title :
Relay Selection for Three-Stage Relaying Scheme in Clustered Wireless Networks
Author :
Lingya Liu ; Cunqing Hua ; Cailian Chen ; Xinping Guan
Author_Institution :
Dept. of Autom., Shanghai Jiao Tong Univ., Shanghai, China
Volume :
64
Issue :
6
fYear :
2015
fDate :
Jun-15
Firstpage :
2398
Lastpage :
2408
Abstract :
For clustered wireless networks, the conventional dual-hop cooperation technique is inefficient since relays with imbalanced channels to the source and the destination may become the bottleneck of the overall transmission. In this paper, a novel cooperative framework called the three-stage relaying (TSR) scheme is proposed to address this problem. In TSR, relays are divided into two clusters/groups, and a virtual multiple-input-multiple-output (MIMO) antenna array is formed by introducing the transmission between the two relay groups. This “relay-to-relay” communication enables transmissions over shorter distances, which naturally breaks the bottleneck emerging in the dual-hop cooperation scheme. An optimization problem is formulated to deal with the relay selection for these two groups, aiming at maximizing the received signal-to-noise ratio (SNR) at the destination, subject to the number-of-relay constraint. This problem turns out to be nontrivial due to the coupling of the relays between two groups. We tackle this challenging problem by decomposing it into two subproblems: One deals with the selection of transmitting relays, and the other deals with the selection of receiving relays. We then propose two heuristic algorithms that achieve the tradeoff between the optimality of the solution and the computational complexity. Through extensive numerical simulations, we show the superiority of TSR over the dual-hop cooperation schemes in both the clustered and centered wireless networks in terms of symbol error rate and throughput.
Keywords :
MIMO communication; antenna arrays; computational complexity; cooperative communication; error statistics; optimisation; relay networks (telecommunication); TSR scheme; centered wireless networks; clustered wireless networks; computational complexity; dual-hop cooperation technique; heuristic algorithm; number-of-relay constraint; numerical simulation; optimization problem; received signal-to-noise ratio; receiving relay selection; relay coupling; relay-to-relay communication; symbol error rate; three-stage relaying scheme; transmitting relay selection; virtual MIMO antenna array; virtual multiple-input-multiple-output antenna array; Heuristic algorithms; MIMO; Optimization; Relays; Signal to noise ratio; Wireless networks; Wireless sensor networks; Clustered networks; cooperative multiple-input multiple-output (MIMO); optimization; spatial diversity;
fLanguage :
English
Journal_Title :
Vehicular Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9545
Type :
jour
DOI :
10.1109/TVT.2014.2342717
Filename :
6863717
Link To Document :
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