臺灣博碩士論文加值系統

本論文係以一自主式最大似然性等化器(MLSE)-Blind Equalizer 技術，應用於泛歐式行動通訊系統上。所謂自主式等化器是指單單利用接收端信號(Receiver Signal)，將輸出端的信號(Sender Signal)順利估測；這有別於傳統可調式等化器(Adaptive Equalizer)，必須使用一個特定訓練信號(Training Signal)來調變等化器。使用此自主式等化器優點在於可提高資料的傳輸量。
一般自主式等化器技術是使用接收端信號之高階統計動量；這類方法之主要缺點：是收斂速度太慢，不適用於時變通道之GSM無線通訊系統。
因此，本論文係由接收端信號分析著手，並使用一快速收斂之非線性自主
式等化器之設計從事研究：即
(i) 以Viterbi演算法為架構來估測輸出信號。
(ii) 以最大似然性檢測法(Maximum-Likelihood Criterion)來預測通道特性。
然後，使用無線通訊系統之通道特性進行模擬，同時將通道特性及輸出信號估測；並量測此等化器之特性。

In the project, a blind equalization by Maximum Likelihood Sequence Estimation (MLSE) is developed and investigated for the Global System Mobile Communication(GSM). The blind equalization techniques have the ability to retrieve the input data, and possibly the channel impulse response, given only the channel output without resorting to any training sequence.
Many of the proposed blind techniques usually incorporate higher order statistical information of the received signal in the error criterion for channel updating. The results in hundreds and typically thousands of received symbols being proposed before the equalizer coefficients converge. It is not suitable for the time-variant channel of the GSM system.
Unlike the blind equalization algorithms reported above, we consider in this project the problem of joint data and channel estimation based on Maximum Likelihood Sequence Estimation (MLSE). As we reviewed, the blind MLSE algorithm exhibits very good convergence behavior.
Subsequently; the simulations with the multipath fading channel models of the mobile radio communication will be proceeded.

中文摘要 I
英文摘要 II
目錄 III
圖表目錄 IV
第一章 前言 1
1.1 研究目的 1
1.2 研究報告之結構 2
第二章 行動通訊系統 3
2.1行動通訊系統之種類 4
2.2泛歐式行動通訊系統 5
第三章 數位通訊信號調變 11
3.1正交調幅系統之自主式等化器 11
3.2泛歐式行動通訊系統信號之線性近似法 12
第四章 自主式最大似然性序列估測演算法 19
4.1最大似然性序列估測演算法 19
4.2 Viterbi演算法 21
4.3通道估測 23
4.4模擬結果 26
第五章 降低狀態序列估測演算法 33
5.1降低狀態序列估測 33
5.2通道估測 35
5.3模擬結果 36
第六章 結論與展望 41
參考文獻 42

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