分集結合技術在相關性中上衰落通道上之二階統計特性 ; Second-Order Statistics of Diversity Combining Receptions over Correlated Nakagami-m Fading Channels

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题名:	分集結合技術在相關性中上衰落通道上之二階統計特性;Second-Order Statistics of Diversity Combining Receptions over Correlated Nakagami-m Fading Channels
作者:	邱中威;Chung-Wei Chiu
贡献者:	通訊工程研究所
关键词:	平均衰落期間;average fade duration;level crossing rate
日期:	2010-07-21
上传时间:	2010-12-09 13:46:02 (UTC+8)
出版者:	國立中央大學
摘要:	在本篇論文中，為了兼顧實用與理論，在實驗室中產生了相關性複數中上衰落通道並且分析相關性通道上分集結合之二階統計特性-水平跨越比例和平均衰落區間。在最大-比率結合的推導中 [20]，利用了匹配濾波器的概念並且假設接收到的信號彼此間是獨立的。而在先前的研究中[45], [46], [49]，他們也是直接利用傳統的最大-比率結合定義-封包平方和。但當接收到的信號間有相關性時，最大-比率結合的傳統定義是錯誤的並且失去了最大訊雜比的優勢。在相關性通道中，最大-比率結合是依照KL 展開式推導獲得 [28]，所以在做最大比率結合前，需要消除信號間的相關性，才能使訊號擁有最大訊雜比。In practice and in theory, correlated complex Nakagami-m fading channels are generated in a laboratory environment, level crossing rate and average fade duration of diversity combining over correlated Nakagami-m fading channels are analyzed in this paper. In the derivation of maximal-ratio combining [20], it uses the concept about matched filter and assumes that received signals are independent. The maximal-ratio combining method that was conventionally employed in the previous studied [45], [46], [49] directly sums envelope squares across all branches. If the fading channels are correlated, this method is definitely incorrectly performed and undoubtedly loses its predominance. By definition, when the fading channels are correlated, the MRC should be derived in accordance with the KL expansion theorem for random processes [28]. As a result, a whitening process has to be conducted prior to the power accumulation process for the maximum SNR.
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