CDMA移动通信信号恒模特性的阵列有源校正算法

CM-Based Array Calibration Algorithm with an Auxiliary Signal Source for CDMA Mobile Communication

基于CDMA通信信号的恒模特性,提出了一种CDMA移动通信中的天线阵通道误差的有源在线校正算法。在天线阵列附近,发射扩谱序列正交于用户信号的同频辅助信号,用辅助信号对阵列接收信号解扩,采用恒模算法自适应的调节阵列通道滤波器参数,达到补偿阵列误差的目的。该方法克服了常规自校正算法受多径效应的影响和难以收敛不足。计算机模拟证实了该方法的有效性。

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.