Distributed Amplify-and-Forward with Ring-TCM Codes
Distributed Amplify-and-Forward with Ring-TCM Codes
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DOI：
10.1109/ccnc.2010.5421691
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发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
Li Chen;R. Carrasco;I. Wassell
中科院分区：
文献类型：
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作者：
Li Chen;R. Carrasco;I. Wassell
本文提出了一种新的分布式放大转发（AF）方案，该方案与环格编码调制（TCM）码相结合，以实现高频谱效率和大分集增益。在分布式AF方案中，更多的用户彼此合作。每个用户仍然使用其传输自由度的一半来中继其他用户的信号。然而，与传统的AF方案不同，每个用户进一步将其中继传输划分为更小的部分，以便帮助更多的用户。结果，对于每个用户，分布式AF方案将具有与传统AF方案相同的频谱效率，但是创建了更多样化的过渡路径并提供了更好的分集增益。在该方案中，输出符号被解复用成几个子帧，每个子帧将由不同的用户中继。结果，来自网格过渡分支的每个输出符号可以由不同的用户中继，从而辅助解码器的纠错性能。这种分布式编码方案适用于不同的无线接入系统，例如WiLAN和WiMAX系统。我们的仿真结果表明，在相同的频谱效率，分布式编码AF方案可以显着优于传统的编码AF方案。
This paper proposes a new distributed Amplify-and-Forward (AF) scheme which is integrated with the Ring-Trellis Coded Modulation (TCM) codes in order to achieve both high spectral efficiency and large diversity gain. In the distributed AF scheme, more users cooperate with each other. Each user still uses half of its transmission freedom for relaying others' signal. However, different to the conventional AF scheme, each user further partitions its relay transmission into smaller divisions in order to help more users. As a result, for each user, the distributed AF scheme will have the same spectral efficiency as the conventional AF scheme, but creating more diverse transition paths and providing better diversity gain. In the scheme, output symbols are demultiplexed into several subframes, each of which will be relayed by a different user. As a result, each output symbol from a trellis transition branch can be relayed by a different user, assisting error-correction performance of the decoder. This distributed coding scheme is suitable for different wireless access systems, such as WiLAN and WiMAX systems. Our simulation results show that with the same spectral efficiency, the distributed coded AF scheme can significantly outperform the conventional coded AF scheme.