Cooperative Relaying Technique for CDMA System with Lossless Transmission-Rate

Jee-Hoon KIM
Hyoung-Kyu SONG

IEICE TRANSACTIONS on Communications   Vol.E90-B    No.2    pp.408-411
Publication Date: 2007/02/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.2.408
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
cooperative relaying,  decode-and-forward,  spreading code,  

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The cooperative relaying technique enables a terminal to get space-diversity through the support of other terminals. However, existing cooperative relaying techniques for code division multiple access (CDMA) system decrease the total system transmission rate. In this letter, a new relaying technique is presented which supplies lossless transmission-rate using 2 spreading codes per terminal. We verify the performance of the proposed technique through a bit error rate (BER) simulation for a direct-sequence ultra wideband (DS-UWB) system. It is also shown that forward error correction (FEC) coding provides a better environment for the cooperative relaying.