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題 名 | Performance Evaluation for a Rake Receiver with Diversity Combining Schemes over Nakagami Channels=耙形接收機使用分集合成技術於中上波道之效能評估 |
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作 者 | 陳雍宗; | 書刊名 | 大葉學報 |
卷 期 | 11:1 2002.06[民91.06] |
頁 次 | 頁1-8 |
分類號 | 448.813 |
關鍵詞 | 中上m-分佈; 最大比例合成器; 等增益合成器; 耙形接收機; Nakagami m-distributed; Maximal-ratio combining; MRC; Equal-gain combining; EGC; Rake receiver; |
語 文 | 英文(English) |
中文摘要 | 本篇論文主要係研究,同調式直接序列劃碼多重近接(DS-CDMA)系統在中上分佈(Nakagami distributed)衰落波道上的分集組合技術,並比較耙形接收機(Rake receiver)使用最大比例合成器(MRC)與等增益合成器(EGC)作合成時的位元錯誤率(bit-error-rate, BER)效能。最後由數值的結果顯示,在指數式的多重路徑振幅剖面(MIP)情況與特殊條件衰落參數為1(m=1)的Rayleigh波道環境中,完全式的MRC合成器可以高出EGC合成器約百分之八十的使用者容量以及會有大約1.5 dB的位元錯誤率效能改善,而且當合成分支的數目越大時,MRC合成器在效能的改善速率上比EGC合成器來得快。然而,對於傳輸於衰落波道中的信號,如果有不精確或不完整的估測時,EGC 合成器便有可能在位元錯誤率的效能上優於MRC合成器。 |
英文摘要 | In this paper, the diversity combining techniques over a Nakagami-faded channel with a coherent direct-sequence code-division multiple-access (DS/CDMA) system are investigated. The performance of bit error rate (BER) is also compared between equal-gain combining (EGC) and maximal-ratio combining (MRC) for a Rake receiver. Numerical results indicate that complete MRC Rake receivers can be feasible for about 80% more user capacity and about 1.5dB improvement in system performance than EGC Rake receivers under exponential multipath intensity profile (MIP) conditions and the special case with a Rayleigh (m=1) fading channel. MRC has a higher rate of improvement than EGC when the number of combined branches increase. However, the performance of EGC reception may become superior to MRC while inaccurate or incomplete estimation in channel fading exists. |
本系統中英文摘要資訊取自各篇刊載內容。