臺灣博碩士論文加值系統

本論文研究在於分析多載波分碼多重進接（MC-CDMA）使用最大比率合成器（maximal ratio combiner; MRC） 及等增益合成器（equal gain combiner; EGC）在中上衰落（Nakagami fading）波道中的性能。整體而言，在給定的位元錯誤率下，使用最大比率合成器的方法會比等增益合成器有較好的系統效能。
研究結果顯示多載波分碼多重進接系統在中上衰落波道下，隨衰落因素 值增加性能將有所改善；而系統載波數目愈多，性能改善也愈多。而與傳統分碼多重進接系統相比，證實多載波分碼多重進接系統可以改善多重路徑衰落對系統效能造成的影響。

In this paper, the average bit error probability of Multi-Carrier Code Division Multiple Access (MC-CDMA) system using maximal ratio com-biner (MRC) and equal gain combiner (EGC) is derived over Nakagami fading channel. It is shown that for a fixed bit error probability, the MRC method has better system performance than the EGC method.
The numerical results indicate that the performance of MC-CDMA becomes better as the fading factor increases. Besides, if the number of the carrier gets more, the error probability of the system will decrease. When comparing with the DS-CDMA system, the MC-CDMA system has demonstrated its superior in system performance to the traditional CDMA system.

摘要ii
ABSTRACTiii
目錄iv
表錄vi
圖錄vii
1. 緒論1
1.1 研究動機與目的1
1.2 論文綱要2
2. 基本原理3
2.1 傳播波道特性3
2.1.1 大尺度衰落3
2.1.2 小尺度衰落5
2.2 傳輸波道統計模型7
2.2.1 對數高斯（lognormal）分佈衰落波道模式8
2.2.2 瑞雷（Rayleigh）分佈衰落波道模式9
2.2.3 萊斯（Rician）分佈衰落波道模式10
2.2.4 中上（Nakagami）分佈衰落波道模式12
2.3 合成技術的原理及種類13
2.3.1 最大比率合成13
2.3.2 等增益合成14
2.4 直序分碼多重進接（DS-CDMA）15
2.5 正交分頻多工（OFDM）18
2.6 多載波直序分碼多重進接（MC-DS-CDMA）21
2.7 多成音分碼多重進接（MT-CDMA）24
2.8 多載波分碼多重進接（MC-CDMA）26
3. 多載波分碼多重進接系統之架構與性能分析28
3.1 多載波分碼多重進接系統架構28
3.1.1 發射機架構28
3.1.2 通道模型30
3.1.3 接收機架構31
3.2 多載波分碼多重進接系統之性能分析33
3.2.1 最大比率合成器35
3.2.2 等增益合成器39
4. 數值分析42
4.1 載波數 與性能之關係43
4.2 衰落因素 與性能之關係44
4.3 載波數 與系統容量之關係46
4.4 衰落因素 與系統容量之關係50
4.5 MC-CDMA與DS-CDMA之比較53
5. 結論56
參考文獻57
自傳60

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