在有限的通道使用量下單一及多個中繼器的動態解碼後傳送協定之分集與多工增益權衡效能的設計與分析

Abstract

考慮一個合作式網路含有一個傳送端，一個接收端以及數個中繼器並使用動 態解碼後傳送(DDF)的通訊協定。在目前已存在的動態解碼後傳送協定中，它會遭 受到一個無限長延遲，這是完全不合實際的。在本篇論文中，我們主要會討論單 一及多個中繼器的動態解碼後傳送協定並在有限的延遲條件下，並分別觀察他們 各自的分級與多工增益權衡效能。並會本篇論文中討論在各種有限延遲下該協定 確切的分級與多工增益權衡的值。我們發現即使是在短延遲的條件下，該協定依 然擁有合理且還不錯的分級與多工增益權衡效能。除此之外，我們觀察到分級與 多工增益權衡效能的曲線值，並不總是隨著延遲的長度增加而增加。

Consider a cooperative network consisting of a source node, a destination node and some relays nodes, and employing a dynamic decode-and-forward (DDF) communication protocol. The existing DDF protocol suffers from a infinitely long delay and is completely impractical. In this thesis, we focus on the finite-delay DDF protocol for both single and multiple relays and investigate the corresponding performance, which is measured by diversity-multiplexing gain tradeoff (DMT). Exact DMT values for any finite-delay DDF are provided in this thesis. It is seen that the finite-delay DDF can have a reasonably good DMT performance even in case of a short delay. Moreover, it is observed that the DMT curve is not always monotonic increasing as the length of delay increase.