Distributed Space-Time Codes Using Constellation Rotation |
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Authors: | Chao Zhang Weidong Wang Guo Wei |
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Affiliation: | 1.Wireless Information Network Lab, Department of Electronic Engineering and Information Science,University of Science and Technology of China,Hefei,China |
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Abstract: | Rate and diversity impose a fundamental tradeoff in wireless communication. We propose a novel distributed space-time coding
(DSTC) scheme based on constellation rotation (DSTC-CR) for Amplify-and-Forward relay networks. The proposed code can achieve
full-diversity or full-rate, and also offers a flexibility for a desired rate-diversity tradeoff. This code can work well
with arbitrary signal constellation and any number of relays and achieve minimal-delay. Through analysis of pairwise error
probability, coding design criteria, Chernoff bound, decoding strategies and optimal power allocation are provided. Simulation
results show that DSTC-CR scheme outperforms diagonal DSTC (DDSTC) and distributed linear dispersion (DLD) code at high power.
From the comparison with DDSTC, the DSTC-CR scheme can achieve the same information rate using a lower modulation order. |
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