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LDPC Codes for Fading Channels: Two Strategies

机译:衰落信道的LDPC码:两种策略

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摘要

This paper compares two approaches to reliable communication over fading channels using low-density parity check (LDPC) codes. The particular model considered is the block fading channel with independent channel realizations. The first approach uses a block inter-leaver to create independent sub-channels that are encoded using irregular LDPC codes with rates specified by the appropriate capacity values; this first approach uses a decision feedback structure wherein decoded data are used as pilots to estimate the channel prior to the next round of decoding. The second approach uses a combined graph describing both the channel and the code to iteratively estimate the channel and decode data. For comparable channels, it is shown that the decision-feedback approach provides better performance when a long delay is acceptable, while the iterative receiver provides better performance when more stringent delay constraints are imposed.
机译:本文比较了使用低密度奇偶校验(LDPC)码在衰落信道上进行可靠通信的两种方法。所考虑的特定模型是具有独立信道实现的块衰落信道。第一种方法使用块交织器创建独立的子信道,这些子信道使用不规则的LDPC码进行编码,速率由适当的容量值指定;该第一种方法使用判决反馈结构,其中将解码后的数据用作导频,以在下一轮解码之前估算信道。第二种方法使用描述信道和代码的组合图来迭代估计信道并解码数据。对于可比较的信道,表明在长延迟是可以接受的情况下,决策反馈方法可以提供更好的性能,而在施加更严格的延迟约束时,迭代接收器可以提供更好的性能。

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