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arXiv 1304.3553cs.ITmath.IT
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离散无记忆继电器通道的可靠性函数

On the Reliability Function of the Discrete Memoryless Relay Channel

Vincent Y. F. Tan

摘要:

利用类型法推导了离散无记忆继电通道可靠性函数的界。基于部分解码-前向和压缩-前向这两种著名的叠加块马尔可夫编码方案,推导出了两种可达误差指数。推导过程需要结合证明信道编码误差指数的Csiszár-Körner-Marton包装引理和证明信源编码误差指数的Marton类型覆盖引理中所涉及的技术,并给出了保真度准则。在Sato中继信道上计算了译码前向误差指数。从这个例子中可以注意到,为了在固定有效编码速率下获得错误概率的最快可能衰减,应该优化块马尔可夫编码方案中的块数量,假设每个块内的块长度很大。可靠性函数的上限也来自使用的想法从Haroutunian的错误概率的下限点到点信道编码反馈。

英文摘要:

Bounds on the reliability function for the discrete memoryless relay channel are derived using the method of types. Two achievable error exponents are derived based on partial decode-forward and compress-forward which are well-known superposition block-Markov coding schemes. The derivations require combinations of the techniques involved in the proofs of Csiszár-Körner-Marton's packing lemma for the error exponent of channel coding and Marton's type covering lemma for the error exponent of source coding with a fidelity criterion. The decode-forward error exponent is evaluated on Sato's relay channel. From this example, it is noted that to obtain the fastest possible decay in the error probability for a fixed effective coding rate, one ought to optimize the number of blocks in the block-Markov coding scheme assuming the blocklength within each block is large. An upper bound on the reliability function is also derived using ideas from Haroutunian's lower bound on the error probability for point-to-point channel coding with feedback.

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