關聯性多輸入輸出環境下之天線資源分配; Antenna Resource Allocation over Correlated MIMO Environment

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題名:	關聯性多輸入輸出環境下之天線資源分配;Antenna Resource Allocation over Correlated MIMO Environment
作者:	潘建安;Chien-An Pan
貢獻者:	通訊工程研究所
關鍵詞:	雷瑞通道容量近似;虛擬域;關聯性多輸入輸出;最小平方誤差通道估測;天線資源分配;Rayleigh channel capacity approximation;MMSE channel estimator;virtual domain;correlated MIMO;antenna allocation
日期:	2006-06-26
上傳時間:	2009-09-22 11:18:58 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	多天線輸入輸出系統之通道會因天線陣列間間隔過小或缺乏散射而有相關性，進而造成通到容量下降與通道估測之誤差。本文提出之多用戶多天線系統架構在接收端架構於虛擬域（virtual domain）的通道估測器以減低因關聯性所造成之估測誤差。接收端回授所得之通道狀態至傳送端以提供天線資源分配所需之資訊。過去的通訊系統資源分配著重在功率與子載波的最佳化，然而本論文試以動態的天線數量分配求取最大可用通道容量而滿足不同使用者之需求作為資源分配之重點。天線資源分配機制在傳送端根據回授之通道資訊以及不同使用者在一時間單位內的通道容量需求決定傳送端應增加或減少之天線數量。本文以數值方法找出一雷瑞通道容量下以通道相關性、接受及傳送天線數、訊雜比為自變數，通道容量為應變數之近似式，以作為傳送天線數邊跟之評量依據。 Scanty scattering of signals as well as insufficient antenna spacing cause channels of antenna array correlated, which degrades the capacity improvement of using multiple antennas and the channel estimation precision. Applying minimum mean square error (MMSE) channel estimation in the virtual domain can apparently lessen the channel estimation error due to the correlation effect. Multi-user multi-antenna transmission architecture with channel estimators cascaded at the receiver side is hence proposed so that each user can feedback channel state information for the further process of antenna resource allocation. On the other hand, traditional resource allocation designs manage to maneuver the resources such as power, subcarriers, etc. This thesis tries to have dynamic antenna allocation as a resource for exploiting the maximum capacity usage based on the data rate requested by each user. Plus, a Rayleigh numerical channel capacity approximation, taking transmitted, received antennas, correlations, and signal-to-noise values as variables, is found to assist the decision of how many transmitted antennas should be added or taken off.
顯示於類別:	[通訊工程研究所] 博碩士論文

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