Analysis on Soft-Decision-and-Forward Cooperative Networks with Multiple Relays

Kyoung-Young SONG  Jaehong KIM  Jong-Seon NO  Habong CHUNG  

IEICE TRANSACTIONS on Communications   Vol.E95-B    No.2    pp.509-518
Publication Date: 2012/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.509
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
cooperative diversity,  Fox's H-function,  moment generating function (MGF),  relay selection,  soft-decision-and-forward (SDF),  

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In this paper, we analyze the best relay selection scheme for the soft-decision-and-forward (SDF) cooperative networks with multiple relays. The term `best relay selection' implies that the relay having the largest end-to-end signal-to-noise ratio is selected to transmit in the second phase transmission. The approximate performances in terms of pairwise error probability (PEP) and bit error rate (BER) are analyzed and compared with the conventional multiple-relay transmission scheme where all the relays participate in the second phase transmission. Using the asymptotics of the Fox's H-function, the diversity orders of the best relay selection and conventional relay scheme for the SDF cooperative networks are derived. It is shown that both have the same full diversity order. The numerical results show that the best relay selection scheme outperforms the conventional one in terms of bit error rate.