DocumentCode :
130694
Title :
Subset relay selection in wireless cooperative networks using sparsity-inducing norms
Author :
Blanco, Leonardo ; Najar, Montse
Author_Institution :
Centre Tecnol. de Telecomunicacions de Catalunya (CTTC), Castelldefels, Spain
fYear :
2014
fDate :
26-29 Aug. 2014
Firstpage :
501
Lastpage :
505
Abstract :
This paper addresses the problem of multiple relay selection in a two-hop wireless cooperative network. In particular, the proposed technique selects the best subset of relays, in a distributed beamforming scheme, which maximizes the signal-to-noise ratio at the destination node subject to individual power constraints at the relays. The selection of the best subset of K relays out of a set of N potential relay nodes, under individual power constraints, is a hard combinatorial problem with a high computational burden. The approach considered herein consists in relaxing this problem into a convex one by considering a sparsity-inducing norm. The method exposed in this paper is based on the knowledge of the second-order statistics of the channels and achieves a near-optimal performance with a computational burden which is far less than the one needed in the combinatorial search. Furthermore, in the proposed technique, contrary to other approaches in the literature, the relays are not limited to cooperate with full power.
Keywords :
array signal processing; convex programming; cooperative communication; relay networks (telecommunication); statistical analysis; distributed beamforming scheme; hard combinatorial problem; multiple relay selection; power constraints; relay nodes; second-order statistics; signal-to-noise ratio; sparsity-inducing norm; two-hop wireless cooperative network; Array signal processing; Relay networks (telecommunications); Signal to noise ratio; Vectors; Wireless communication; Relay selection; distributed beamforming; semidefinite relaxation; sparsity-inducing norms;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Wireless Communications Systems (ISWCS), 2014 11th International Symposium on
Conference_Location :
Barcelona
Type :
conf
DOI :
10.1109/ISWCS.2014.6933405
Filename :
6933405
Link To Document :
بازگشت