非線性信道自適應(yīng)均衡的一種方法
A NEW ADAPTIVE EQUALIZER STRUCTURE FOR NONLINEAR CHANNELS
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摘要: 本文通過對非線性信道模型的分析,構(gòu)造了一種新的、關(guān)聯(lián)模型的自適應(yīng)均衡器。分析表明,與一般的基于Volterra級數(shù)的非線性擴(kuò)展關(guān)聯(lián)模型相比,新結(jié)構(gòu)的權(quán)數(shù)大為減少。模擬實驗證實,當(dāng)信道噪聲較小時,新結(jié)構(gòu)以較高的精度收斂于最佳解。而且無論對最小相位或非最小相位信道,該均衡器均表現(xiàn)出良好的收斂特性和誤碼性能。
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關(guān)鍵詞:
- 非線性系統(tǒng); 自適應(yīng)均衡; 逆濾波
Abstract: Based on analysis of non-linear channel models, a new connectionist model adaptive equalizer is constructed. Comparing with the connectionist model using the Volterra series to extend the input vector space, the number of weights with new structure is reduced significantly. It is shown by simulations that the weight values of the new scheme converge to the optimal values closely for nonminimum phase channels as well as minimum phase channels, if the channel noise is small enough, Testing results of the BER (Bit Error Rate) show that the new adaptive equalizer for non-linear channels is superior to the linear equalizer in the equalization performances. -
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