A distributed linear convolutive space-frequency coding for cooperative communication systems with multiple frequency offsets

Authors:
Huiming Wang;Xiang-Gen Xia;Qinye Yin;Lin Bai
Affiliations:
School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, P. R. China;Department of Electrical and Engineering, University of Delaware, Newark, DE;School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, P. R. China;School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, P. R. China
Venue:
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Year:
2009

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Abstract

Multiple frequency offsets (CFO) in cooperative communications are difficult, if not impossible, to compensate completely at the destination node. The multiple CFO make the channel time-varying, and thus the conventional space-time codes to collect diversity gain for co-located multi-input multi-output (MIMO) systems may not be applied directly. In a previous paper, we proposed a distributed space-frequency code (SFC), called frequency-reversal SFC (FR-SFC), for cooperative transmissions with multiple CFOs and flat fading channels. We have shown that this code can achieve the full cooperative diversity with only linear receivers, such as zero-forcing (ZF) and minimum mean square error (MMSE) receivers. However, the code is not bandwidth efficient when the relay nodes are more than 3. To have a higher bandwidth efficiency, in this paper we propose a new distributed SFC called frequency-domain linear convolutive SFC(FLC-SFC). The symbol rates of the new codes approach 1 when code block length is sufficiently larger than the number of relay nodes. Furthermore. It achieves the full cooperative diversity with linear receivers.