Performance of Block-Double Differential Design for Broadband Cooperative Communications with Carrier Frequency Offsets

Zhenzhen GAO  Shihua ZHU  Jing XU  Zhimeng ZHONG 

Publication
IEICE TRANSACTIONS on Communications  Vol.E92-B  No.7  pp.2507-2511
Publication Date: 2009/07/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
block-double differential,  carrier frequency offset,  frequency-selective fading,  decode-and-forward, 

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Summary: 
In this letter, a relay-assisted transmission scenario over frequency-selective fading channels perturbed by different random carrier frequency offsets is considered. OFDM and block-double differential (BDD) design are implemented to overcome the problem of intersymbol interference (ISI) and carrier frequency offsets (CFOs). We analyze the symbol error rate (SER) performance of decode-and-forward relaying with BDD design in wireless cooperative communications over frequency-selective fading channels and derive a theoretical upper bound for average SER when the relay (R) is error free. It can be seen from our analysis that the system performance is influenced by the ability of R to decode, and when R decodes without error, both spatial and multipath diversity can be obtained without requiring any knowledge of channel state information and CFO information at the receivers. Numerical examples are provided to corroborate our theoretical analysis.