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Adaptive Noncoherent DS/CDMA Single-User Receivers with MDSPK Signals
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|摘要:||在直序展頻分碼多工(DS/CDMA)通訊系統中，其傳輸容量將會被多重存取干擾(MAI)及遠近效應(near-far effect)等問題所限制。多用戶接收器則提供了解決這些問題的方法，但需要知道多重存取干擾的所有使用參數並且也會有較高的運算複雜度。而單用戶接收器則沒有這些問題，它不需要知道這些參數而且有較低的運算複雜度。在本論文中，我們使用非同調(noncoherent)接收器用於M-ary差分相移鍵信號傳輸在有符號間干擾(ISI)的通道中，其中非同調接收器是由一個線性等化器及迴饋決策差分偵測器(DF-DD)所組成。我們提出了六種不同的差分等化器架構並分別使用了正交及非正交二種展頻碼和二種不同的通道環境去模擬我們的實驗結果。其等化器均使用最小均方誤差(Least mean square)演算法來調整其係數。模擬結果將會呈現在不同的展頻碼、等化器架構及通道環境中，位元錯誤率(BER)的變化情形。|
The capacity of a DS/CDMA system is limited by multiple access interference and the near-far problem. Multiuser receivers provide a solution to these problems, but they require knowledge of parameters of the MAI and are computationally complex. Adaptive single-user receivers do not require knowledge of MAI parameters and need fewer computations. Noncoherent receiver for M-ary differential phase-shift keying signals transmitted over intersymbol interference channels is presented. The noncoherent receiver consists of a linear equalizer and a decision-feedback differential detector (DF-DD). This paper presents DS/CDMA for orthogonal and non-orthogonal spreading sequences with six differential equalizers and two channels. Furthermore, we employed modified least mean square (LMS) algorithm for adaptation of the equalizer coefficients.
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