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首页> 外文期刊>Information Theory, IEEE Transactions on >Training-Symbol Embedded, High-Rate, Single-Symbol ML-Decodable, Distributed STBCs for Relay Networks
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Training-Symbol Embedded, High-Rate, Single-Symbol ML-Decodable, Distributed STBCs for Relay Networks

机译：用于中继网络的训练符号嵌入式，高速率，单符号ML可解码的分布式STBC

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摘要

Distributed space-time block codes (DSTBCs) from complex orthogonal designs (CODs) (both square and nonsquare), coordinate interleaved orthogonal designs (CIODs), and Clifford unitary weight designs (CUWDs) are known to lose their single-symbol ML decodable (SSD) property when used in two-hop wireless relay networks using amplify and forward protocol. For such networks, in this paper, three new classes of high rate, training-symbol embedded (TSE) SSD DSTBCs are constructed: TSE-CODs, TSE-CIODs, and TSE-CUWDs. The proposed codes include the training symbols inside the structure of the code which is shown to be the key point to obtain the SSD property along with the channel estimation capability. TSE-CODs are shown to offer full-diversity for arbitrary complex constellations and the constellations for which TSE-CIODs and TSE-CUWDs offer full-diversity are characterized. It is shown that DSTBCs from nonsquare TSE-CODs provide better rates (in symbols per channel use) when compared to the known SSD DSTBCs for relay networks. Important from the practical point of view, the proposed DSTBCs do not contain any zeros in their codewords and as a result, antennas of the relay nodes do not undergo a sequence of switch on/off transitions within every codeword, and, thus, avoid the antenna switching problem.
机译：众所周知，复杂正交设计（COD）（正方形和非正方形），坐标交错正交设计（CIOD）和Clifford单一权重设计（CUWD）的分布式时空分组码（DSTBC）会丢失其单符号ML可解码（ （SSD）属性在使用放大和转发协议的两跳无线中继网络中使用时。对于此类网络，本文构建了三种新型的高速率，训练符号嵌入式（TSE）SSD DSTBC：TSE-COD，TSE-CIOD和TSE-CUWD。所提出的代码在代码的结构内包括训练符号，这被证明是获得SSD特性以及信道估计能力的关键点。 TSE-COD被证明可为任意复杂星座提供全集，并且对TSE-CIOD和TSE-CUWD提供全集的星座进行了特征分析。结果表明，与已知的中继网络SSD DSTBC相比，来自非方形TSE-COD的DSTBC提供了更高的速率（以每个通道使用的符号表示）。从实用的角度来看很重要，建议的DSTBC在其代码字中不包含任何零，因此，中继节点的天线不会在每个代码字中经历一系列的开/关转换，因此避免了天线切换问题。

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