基于變步長(zhǎng)LMS的自適應(yīng)匹配算法
Adaptive Matched Demodulation Algorithm Based on LMS with Variable Step Size
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摘要: 基于最小均方誤差準(zhǔn)則,提出了一種用于抑制異步直擴(kuò)CDMA系統(tǒng)中的多址干擾的變步長(zhǎng)LMS自適應(yīng)匹配算法。計(jì)算機(jī)仿真結(jié)果表明,基于該類算法的自適應(yīng)解擴(kuò)多用戶檢測(cè)器無(wú)須知道任何用戶的地址碼,具有良好的抗遠(yuǎn)近效應(yīng)能力,與類似的變步長(zhǎng)LMS算法相比,該算法具有更低的誤碼率、更快的收斂速度和跟蹤速度,特別是其控制參數(shù)在信道參數(shù)發(fā)生變化時(shí)不需重新調(diào)整,同時(shí)具有廣泛的應(yīng)用前景。Abstract: Based on Minimum-Mean-Square-Error(MMSE) criterion, a kind of LMS algorithm with variable step size is proposed to suppress Multi-Access Interference (MAI) in asynchronous DS-CDMA system. Compare with similar variable step size LMS algorithm, computer simulation results show that the kind of detector is insensitive to the near-far effect and its structure is very simple. At the same time, it has lower bit error rate and faster speed of convergence and tracking without increasing computational complexity. In particular, the controlling parameters of proposed algorithm are not required to re-adjust, even if the channel parameter changes. So it can be widely used.
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