Non-coherent distributed space-time coding techniques for two-way wireless relay networks

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• 作者：Samer Alabed ; Marius Pesavento ; Anja Klein
• 关键词：Two-way wireless relay networks ; Distributed space&ndash ; time coding ; Differential space&ndash ; time coding ; Cooperative diversity
• 刊名：Signal Processing
• 出版年：2013
• 出版时间：December, 2013
• 年：2013
• 卷：93
• 期：12
• 页码：3371-3381
• 全文大小：522 K

文摘

To overcome the overhead involved with channel estimation, several non-coherent distributed space-time coding (DSTC) strategies for two-way wireless relay networks (TWRNs) using the amplify-and-forward and the decode-and-forward protocol have been recently proposed that do not require channel state information (CSI) at any node to decode the information symbols. In this paper, novel differential DSTC strategies for TWRNs using the two- and three-phase protocol are proposed. In our transmission schemes, the relays do not waste power to transmit information known at the respective destination nodes. This is achieved by combining the symbols from both terminals received at the relays into a single symbol of the unaltered constellation. Furthermore, in our strategies, the direct link between the communicating terminals can be naturally incorporated to further improve the diversity gain. Simulations show a substantially improved performance in terms of bit error rate (BER) of the proposed strategies as compared to the existing strategies.