Design of Blind Adaptive Mobile Receiver in MC-CDMA Communication Systems 魏文韜、武維疆
E-mail: 9607567@mail.dyu.edu.tw
ABSTRACT
This paper deals with the design of blind (without exploiting training sequences and undesired users’ signature sequences) adaptive mobile receiver in downlink multicarrier CDMA (MC-CDMA) system. We first derive the batch mode constrained
minimum-output-energy (MOE) receiver. Furthermore, a blind channel estimator is deduced by choosing appropriate constraints to ensure no desired signal cancellation. To reduce the computation load, we propose a blind adaptive channel estimator, which is designed to meet the criterion of maximizing the minimum possible MOE receiver’s output energy. The estimated channel parameters are employed to determine the weight vector at the mobile station (MS) receiver. The proposed algorithm are based on recursive-least-squares (RLS) and generalized sidelobe canceller (GSC) as well as gradient search adaptation rule. Simulation results demonstrate that the performance of the proposed blind adaptive mobile receiver converge to the optimum batch-mode MOE receiver. Moreover, the algorithm are verified to be robust to near-far problem.
Keywords : MC-CDMA ; minimum-output-energy ; recursive-least-squares ; blind ; adaptive ; generalized-sidelobe-canceller Table of Contents
授權書．．．．．．．．．．．．．．．．．．．．．iii 中文摘要．．．．．．．．．．．．．．．．．．．．iv 英文摘 要．．．．．．．．．．．．．．．．．．．．v 誌謝．．．．．．．．．．．．．．．．．．．．．．vi 目錄．．．．
．．．．．．．．．．．．．．．．．．vii 圖目錄．．．．．．．．．．．．．．．．．．．．．ix 表目錄．．．．．．
．．．．．．．．．．．．．．．xi 第一章 緒論．．．．．．．．．．．．．．．．．．1 1.1 研究動機．．．．．．．
．．．．．．．．．．．1 1.2 研究方法．．．．．．．．．．．．．．．．．．2 1.3 內容大綱．．．．．．．．．．．
．．．．．．．3 第二章 訊號處理技術．．．．．．．．．．．．．．4 2.1 MPDR beamforming 演算法．．．．．．．
．．． 4 2.2 RLS演算法．．．．．．．．．．．．．．．．． 6 2.3 GSC演算法．．．．．．．．．．．．．．．．． 12 2.4 Gradient Search．．．．．．．．．．．．．． 16 第三章 MC-CDMA系統．．．．．．．．．．．．．． 19 3.1 CDMA系統簡介．．．．．．．．．．．．．．．．19 3.2 處理增益與展頻碼．．．．．．．．．．．．．．21 3.2.1 處 理增益．．．．．．．．．．．．．．．．．21 3.2.2 假隨機序列與正交展頻碼．．．．．．．．．．22 3.3 MC-CDMA 系統．．．．．．．．．．．．．．．． 24 3.3.1 MC-CDMA基本架構．．。．．．．．．．．．． 24 3.3.2 MC-CDMA 接收信號模型．．．．．．．．．．． 29 3.4 MC-CDMA接收端檢測法．．．．．．．．．．．． 31 3.4.1 最大比例法．
．．．．．．．．．．．．．．．32 3.4.2 等效增益法．．．．．．．．．．．．．．．．33 3.4.3 回覆正交法．．．．．
．．．．．．．．．．．34 第四章 下鏈MC-CDMA系統之適應性盲蔽式接收機設計 36 4.1 信號模型．．．．．．．．
．．．．．．．．．．36 4.2 盲蔽式MOE接收機設計．．．．．．．．．．．． 40 4.3 盲蔽式通道估計演算法．．．．．
．．．．．．．42 4.4 RLS-Gradient適應性盲蔽式MOE接收機設計．．． 44 4.5 GSC演算法之適應性盲蔽式MOE接收機 設計．．．．53 4.6 數值分析與效能評估．．．．．．．．．．．．．58 4.6.1數值設定．．．．．．．．．．．．．．．
．． 58 4.6.2數值分析．．．．．．．．．．．．．．．．． 58 第五章 結論．．．．．．．．．．．．．．．．．．66 參考文獻．．．．．．．．．．．．．．．．．．．．67 附錄A．．．．．．．．．．．．．．．．．．．．． 69 REFERENCES
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