Multihopping Strategies: An Error-Exponent Comparison
Multihopping Strategies: An Error-Exponent Comparison
复制标题
多跳策略：误差指数比较
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
U. Mitra
中科院分区：
文献类型：
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作者：
Wenyi Zhang;U. Mitra
据信，多霍普通道可以为性能带来好处，因为每场跳动距离的降低直接转化为增加的通道增长。但是，多直接传输的潜在问题是，所产生的延迟也随啤酒花的数量增加，因此可能对延迟敏感的应用构成挑战。本文从错误指数的角度研究了延迟问题，这是由于延迟与可靠性紧密相结合的事实。比较了两种多名策略。串联编码策略（中继节点执行内部编码，源死亡对进一步执行外部编码），可表明以较低的速率提供了近乎最佳的性能。相比之下，传递策略可以将继电器节点解释或简单地传递接收的符号，而随着可实现的速率的提高，则显示出优于串联编码策略。该比较分别提出了高利率应用和低利率应用的不同系统体系结构。
Multihop channels are believed to provide benefits in performance because the reduction in transmission distance per hop directly translates to increased channel gains. However, a potential concern of multihop transmission is that the incurred delay also increases with the number of hops, and hence may pose challenges for delay-sensitive applications. This paper investigates the issue of delay from the perspective of error exponents, motivated by the fact that delay is tightly coupled with reliability. Two multihopping strategies are compared. The concatenated coding strategy, in which relay nodes perform inner coding and the source-destination pair further performs outer coding, is shown to provide near-optimal performance at low rates. In contrast, the pass-or-decode strategy, where relay nodes can either decode-and-forward or simply pass the received symbols, is shown to outperform the concatenated coding strategy as the achievable rate increases. The comparison suggests different system architectures for high and low rate applications,respectively.