臺灣博碩士論文加值系統

本論文旨在研究多蜂巢多載波分碼多重近接(MC-CDMA)蜂巢式系統結合等增益(equal gain combining, EGC) 合成方式，工作於具多蜂巢遠處基地台(further base station, FBS)環境與相關衰落通道上之研究。本文中得到一個含有一般式的Laguerre多項式和MC-CDMA 系統平均位元錯誤率 (bit error rate, BER)，而且具任意相關係數之分集結合器的新聯合機率密度函數的封閉形式方程式。結果證明BER取決於多蜂巢環境之分集分支相關特性，而且其受到分支的相關影響十分明顯。

In this paper, the impact of the correlation on the performance of multiple-cell MC-CDMA (multiple-cell codel-division multiple-access) cellular systems in FBS(further base station) environment with fading channels is investigated. A new closed-form formula for the joint probability density function (joint pdf) of the diversity combiner with arbitrary correlation coefficients in terms of the generalized Laguere polynomial and new expressions of average bit-error rate (BER) for the MC-CDMA system are given in this paper. The results demonstrate that the BER is significantly dependent on the correlation characteristic of diversity branching for multiple-cell environments.

第一章 緒論．．．．．．．．．．．．．．．．．．．．．．．1
1.1 研究動機與目的．．．．．．．．．．．．．．．．1
1.2 論文綱要．．．．．．．．．．．．．．．．．．．3
第二章 訊號衰落．．．．．．．．．．．．．．．．．．．．．5
2.1 訊號衰落的介紹．．．．．．．．．．．．．．．．5
2.2 電波傳輸現象．．．．．．．．．．．．．．．．．6
2.2.1反射．．．．．．．．．．．．．．．．．．7
2.2.2繞射．．．．．．．．．．．．．．．．．．7
2.2.3散射．．．．．．．．．．．．．．．．．．7
2.3 衰落的分類．．．．．．．．．．．．．．．．．．8
2.3.1 大尺度衰落．．．．．．．．．．．．．．．9
2.3.1.1 路徑損耗．．．．．．．．．．．．．9
2.3.1.2 遮蔽效應．．．．．．．．．．．．13
2.3.2 小尺度衰落．．．．．．．．．．．．．．．13
2.3.2.1 時間延遲擴散．．．．．．．．．．15
2.3.2.2 時域上的變動性．．．．．．．．．17
2.4 多重路徑及多重衰落簡介．．．．．．．．．．．19
2.5 多重路徑衰落所造成的效應．．．．．．．．．．19
2.6 衰落通道的數學模型．．．．．．．．．．．．．20
2.7 常用通信波道統計分佈介紹與比較．．．．．．．23
2.7.1 Normal(Gaussian)衰落分佈．．．．．．．．23
2.7.2 Rayleigh衰落分佈．．．．．．．．．．．．26
2.7.3 Rician衰落分佈．．．．．．．．．．．．29
2.7.4 Nakagami衰落分佈．．．．．．．．．．．34
第三章 CDMA系統簡介．．．．．．．．．．．．．．．．．38
3.1 前言．．．．．．．．．．．．．．．．．．．．38
3.2 DS-CDMA系統．．．．．．．．．．． ．．．．38
3.3 MC-CDMA系統．．．．．．． ．．．．．．．40
3.4 Multicarrier (MC)-DS-CDMA系統．．．．．．．．43
3.5 Multi-tone(MT)-CDMA系統．．．．．．．．．．45
第四章 分集合成技術．．．．．．．．．．．．．．．．．．48
4.1 系統模式．．．．．．．．．．．．．．．．．．48
4.1.1極化分集．．．．．．．．．．．．．．．49
4.1.2 頻率分集．．．．．．．．．．．．．．．50
4.1.2.1 選擇性合成．．．．．．．．．．．．51
4.1.2.2 最大比例合成．．．．．．．．．．．52
4.1.3 空間分集．．．．．．．．．．．．．．．．54
4.1.4 時間分集．．．．．．．．．．．．．．．．55
第五章 多蜂巢 MC-CDMA 系統於Nakagami-m 衰落之分析．57
5.1 系統模式．．．．．．．．．．．．．．．．．．57
5.1.1 發射機模式．．．．．．．．．．．．．．．57
5.1.2 接收機與通道模式．．．．．．．．．．．．58
5.2 決策變數之統計特性．．．．．．．．．．．．．59
5.3 聯合pdf之計算．．．．．．．．．．．．．．．．60
5.4 數值分析結果與討論．．．．．．．．．．．．．61
第六章 結論．．．．．．．．．．．．．．．．．．．．．．66
參考文獻．．．．．．．．．．．．．．．．．．．．．．．．67
附 錄．．．．．．．．．．．．．．．．．．．．．．．．．69

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