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Distributed Space-Frequency Coding for Cooperative Diversity in Broadband Wireless Ad Hoc Networks

A distributed space-frequency (SF) coded cooperative technique is proposed for broadband wireless ad-hoc networks, where both the channels from the source node to relay nodes and from the relay nodes to the destination node are characterized by frequency-selective fading. Using an SF coding at the s...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2008-03, Vol.7 (3), p.995-1003
Main Authors: Wei Zhang, Yabo Li, Xiang-Gen Xia, Ching, P.C., Ben Letaief, K.
Format: Article
Language:English
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Summary:A distributed space-frequency (SF) coded cooperative technique is proposed for broadband wireless ad-hoc networks, where both the channels from the source node to relay nodes and from the relay nodes to the destination node are characterized by frequency-selective fading. Using an SF coding at the source node and a circular shift at each relay node, we propose a scheme that can achieve both cooperative and multi-path diversity. The pairwise error probability is analyzed and the result demonstrates that a diversity gain of min(ML 1 , ML 2 ) can be achieved, where M is the number of the relay nodes, and L 1 and L 2 are the number of taps of the multipath fading channels from the source node to the relay nodes and from the relay nodes to the destination node, respectively. Furthermore, the proposed distributed SF coding can achieve full-rate transmission for any number of relay nodes. In particular, it does not need IFFT/FFT processing or decoding at each relay node, thus providing a low-complexity design of the relay nodes in broadband wireless ad-hoc networks.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2008.060717