CDMA移動通信信號恒模特性的陣列有源校正算法

基于CDMA通信信號的恒模特性，提出了一種CDMA移動通信中的天線陣通道誤差的有源在線校正算法。在天線陣列附近，發(fā)射擴譜序列正交于用戶信號的同頻輔助信號，用輔助信號對陣列接收信號解擴，采用恒模算法自適應(yīng)的調(diào)節(jié)陣列通道濾波器參數(shù)，達到補償陣列誤差的目的。該方法克服了常規(guī)自校正算法受多徑效應(yīng)的影響和難以收斂不足。計算機模擬證實了該方法的有效性。

Using the constant modulus (CM) property of the CDMA mobile communication signal, an online calibration algorithm, which calibrates the antenna array channel amplitude and phase errors using an auxiliary signal nearby the antenna array, is presented. Despreading the array receiving signal with the spread spectrum sequence being orthogonal to user’s, and the coefficients of the channel FIR filter are then adjusted by CM algorithm adaptively to compensate the errors. Unlike the conventional self-calibration methods, it can be not affected by multi-path, and speeds up the convergence. Simulation demonstrates its validity.