A Distributed Linear Convolutive Space-Frequency Coding for Cooperative Communication Systems with Multiple Frequency Offsets

作者：Wang Huiming^*; Xia Xiang Gen; Yin Qinye; Bai Lin

来源：IEEE International Conference on Communications (ICC 2009), 2009-06-14 To 2009-06-18.

DOI：10.1109/icc.2009.5198597

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.

• 出版日期2009
• 单位西安交通大学