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Asynchronous Communication: Capacity Bounds and Suboptimality of Training

机译：异步通信：培训的能力界限和次优

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摘要

Several aspects of the problem of asynchronous point-to-point communication without feedback are developed when the source is highly intermittent. In the system model of interest, the codeword is transmitted at a random time within a prescribed window whose length corresponds to the level of asynchronism between the transmitter and the receiver. The decoder operates sequentially and communication rate is defined as the ratio between the message size and the elapsed time between when transmission commences and when the decoder makes a decision. For such systems, general upper and lower bounds on capacity as a function of the level of asynchronism are established, and are shown to coincide in some nontrivial cases. From these bounds, several properties of this asynchronous capacity are derived. In addition, the performance of training-based schemes is investigated. It is shown that such schemes, which implement synchronization and information transmission on separate degrees of freedom in the encoding, cannot achieve the asynchronous capacity in general, and that the penalty is particularly significant in the high-rate regime.
机译：当源是高度间歇性的时，将开发出无反馈的异步点对点通信问题的几个方面。在所关注的系统模型中，码字是在规定窗口内的随机时间发射的，该窗口的长度对应于发射器和接收器之间的异步程度。解码器按顺序操作，通信速率定义为消息大小与开始传输和做出决策之间的经过时间之间的比率。对于这样的系统，建立了作为异步水平的函数的一般的容量上限和下限，并且在某些非平凡的情况下它们显示是一致的。从这些界限中，可以得出这种异步能力的几个属性。另外，研究了基于训练的方案的性能。示出了这样的方案，该方案在编码中的单独的自由度上实现同步和信息传输，通常不能实现异步容量，并且这种代价在高速率方案中特别重要。

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