On an MC-DS-CDMA System with Rake Receiver with Unequal Fading Figures 蘇妍蓉、陳雍宗
E-mail: 9606963@mail.dyu.edu.tw
ABSTRACT
The evaluation of system performance of an MC-DS-CDMA (multicarrier direct-sequence coded-division multiple-access) system with dual-dimension (antenna diversity) Rake receiver is proposed in this investigation. The working environment for the scenario is considered as situating in frequency selective fading. Furthermore, some of the system parameters, e.g., the resolvable multipath number, the number of a Rake receiver, the fading parameter the power decay factor MIP (multipath intensity profile), and the correlation characteristic between the antennas, are adopted for analyzing. It is the original proposal of such scenario with
dual-dimension Rake receiver for the MC-DS-CDMA system. In order to validate the accuracy of the derivative, a lot of numerical results are conduct in this paper. It is worthwhile claiming that is not only the fading parameter of the correlated-fading model dominates the system performance of the MC-DS-CDMA system, but the number of antennas also definitely affects the system performance.
Keywords : MC-DS-CDMA system ; dual-dimension Rake ; MIP ; antenna 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... x 表目
錄... xii 第一章 緒論... 1 1.1 研就動機與目的... 1 1.2 論文綱 要... 2 第二章 CDMA系統簡介... 3 2.1 DS-CDMA系統... 3 2.2 Multicarrier( MC )-CDMA系統... 6 2.3 MC-DS-CDMA系統... 8 2.4 MT( Multic-tone )-CDMA系 統... 10 第三章 衰落通道理論... 12 3.1 訊號衰落的介紹... 13 3.2 多重路徑及多重衰落 簡介... 13 3.3 多重路徑衰落所造成的效應... 14 3.4 衰落的分類... 15 3.4.1 小尺度衰 落... 15 3.4.1.1 時間延遲擴散... 15 3.4.1.2 時域上的變動性... 16 3.4.2 大尺度衰 落... 18 3.4.2.1 路徑損耗... 18 3.4.2.2 遮蔽效應... 22 3.5 衰落通道的數學模 型... 23 3.6 通道統計分佈... 25 3.6.1 Normal(Gaussian)衰落分佈... 25 3.6.2 Rayleigh衰 落分佈... 28 3.6.3 Rice衰落分佈... 31 3.6.4 Nakagami-m衰落分佈... 35 第四章 衰落 通道理論... 39 4.1系統模型... 40 4.1.1發射器模型... 40 4.1.2通道模 型... 41 4.1.3接收器模型... 42 4.2二維耙式PDF的決策統計... 48 4.3平均位元 錯誤率計算... 51 4.3.1非相關通道條件之系統BER... 51 4.3.2 相關通道條件之系統BER分析...
53 4.4數值結果與分析... 56 第五章 結論... 61 參考文獻... 62 附錄 一... 66
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