Research on Multiuser Detection for Space-Time Coded MC-CDMA Mobie Communication Systems
林國維、黃永發 ; 陳雍宗
E-mail: 9315076@mail.dyu.edu.tw
ABSTRACT
In this paper, we investigate the performance of multiuser detection in space-time coded multi-carrier code-division multiple-access (STC-MC-CDMA) mobile communication systems over frequency selective fading channels. The Alamouti’s space-time coding scheme that involves two transmit antennas is performed to investigate the transmit diversity for MC-CDMA systems. Using two transmit antennas and two receive antennas the scheme provides temporal diversity and spatial diversity. Simulation results show that the performance of minimum mean square error (MMSE) detectors is compared with orthogonality restoring combining (ORC), equal gain combining (EGC) and controlled equalization combining (CEC) detector is investigated. The performance of MMSE detector is much better than ORC, EGC, and CEC detectors with two antennas for both transmitter and receiver for STC-MC-CDMA systems. It is noted that a 10dB-gain can be achieved for the STC-MC-CDMA systems with two receive antennas comparing with the conventional single-transmit-antenna MC-CDMA systems.
Keywords : space time coding ; frequency selective fading channels ; MMSE ; temporal diversity ; spatial diversity Table of Contents
封面內頁 簽名頁 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 符號說明……
……… xii 第一章 緒論 1.1 研究動機與背景………1 1.2 研究方法與目的………4 1.3 各章提要………4 第二章 無線通訊 系統之通道 2.1 簡介………5 2.2 大範圍衰退模型與小範圍衰退模型………6 2.2.1 大範圍衰退傳播模型………6 2.2.2 小範圍衰退傳播模型………9 2.3 無線通訊系統通 道的時散特性………11 2.4 多路徑通道模型………13 第三章 多載波分碼多重存取系 統 3.1 介紹………14 3.2 系統模型………15 3.2.1 傳送 模型………15 3.2.2 通道模型………17 3.2.3 接收模型………
………18 3.3 檢測方法………19 3.3.1 回復正交結合檢測法………
……21 3.3.2 等增益結合檢測法………23 3.2.3 控制等化結合檢測法………26 第四章 空 時編碼多載波分碼多重存取系統 4.1 2ISO STC-MC-CDMA系統………30 4.1.1 2ISO STC-MC-CDMA系 統最小均方誤差 檢測………34 4.2 2I2O STC-MC-CDMA系統………40 4.2.1 2I2O STC-MC-CDMA系統最小均方誤差 檢測………43 第五章 電腦模擬與結果 5.1 四種檢測方法的效能比較………50 5.2 STC-MC-CDMA系統分集效能改善與比較………52 第六章 結論………57 參考文獻………58 REFERENCES
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