Receive Diversity Combining Techniques for SC-FDMA-Based Cooperative Relays

Kyung-Soo WOO  Yeong-Jun KIM  Hyun-Il YOO  Jaekwon KIM  Sangboh YUN  Yong-Soo CHO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E93-B   No.8   pp.2195-2198
Publication Date: 2010/08/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
SC-FDMA,  multi-hop relay,  cooperative relay,  S-MRC,  IR-MRC,  

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Summary: 
In this letter, two receive diversity combining techniques are proposed for cooperative relay systems based on single-carrier frequency division multiple access (SC-FDMA) when relay station (RS) transmits the received signals from multiple mobile stations (MSs) together using one large size discrete Fourier transform (DFT). A simplified-MRC (S-MRC) technique performs diversity combining in the time-domain by using the estimated channel weights and initial estimates obtained by the SC-FDMA signal detector. An interference rejection-MRC (IR-MRC) technique performs diversity combining in the frequency-domain by adjusting the DFT spreading size at the receiver. It is shown by computer simulation that the proposed receive combining techniques achieve a significant diversity gain over the conventional techniques.