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標題: | 多輸入多輸出正交分頻多工系統盲通道估測演算法之效能分析 Blind Channel Estimation Performance Analysis in MIMO Cyclic Prefixed OFDM Systems |
作者: | Kia-Han Tseng 曾楷涵 |
指導教授: | 蘇柏青(Borching Su) |
關鍵字: | 盲通道估測,循環前置,Cramer-Rao界線,效能分析,多輸入多輸出, Blind channel estimation,cyclic prefixed,Cramer-Rao bound,performance analysis,repetition index,MIMO, |
出版年 : | 2014 |
學位: | 碩士 |
摘要: | 本論文探討在多輸入多輸出循環前置正交分頻多工系統下的盲通道估測。主要在的貢獻在從理論觀點研究此問題,包含理論的效能界限以及提出演算法之效能分析。所推導的Cramer-Rao 界限能有效應用在任意數目的傳送天線、接收天線及接收區塊的盲通道估測,並可被視為近期發表的子空間盲通道估測演算法的效能指標。電腦模擬結果中將比較這些演算法的效能及推導出的Cramer-Rao 界限。結果顯示出現行的盲通道演算法效能仍有進步的空間,由其是在低訊雜比區間。因此,我們藉著將彩色雜訊矩陣轉成白雜訊增進了一個最近發表的演算法在低訊雜比區間的效能。基於一階擾動分析,我們也展示了此方法的效能分析。 In this thesis, we study blind channel estimation in multi-input, multioutput (MIMO) cyclic prefixed (CP) based orthogonal frequency division multiplexing (OFDM) system. Our main contributions are of theoretical aspects of this problem including a theoretical performance bound and performance analysis of the proposed method. The derived Cramer-Rao bound (CRB) for blind channel estimation bound is valid for arbitrary numbers of transmit antennas, received antennas, and received symbols available for blind channel estimation, and serve as a benchmark of performances for several recently reported subspace-based methods. Computer simulations are conducted to compare the performance of these methods with the derived bound. The results show that there are still rooms for improvement for the currently available blind channel estimation methods, especially in low signal-to-noise (SNR) region. Therefore, we improves the performance of a recently reported subspace-based blind channel method in low SNR region by turning the colored noise matrix into the white one. The theoretical performance analysis of our proposed method is also presented, which is based on the first order approximation in the small perturbation analysis. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/57268 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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