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基于对修正的常数模算法(MCMA)进行分析,提出了一种用于QPSK(四进制相移键控)信号的快速载波恢复盲均衡算法。该算法中构造了一种与MCMA算法不同的、能够快速收敛的误差函数,在消除码间干扰(ISI)、纠正相位误差的同时,进一步改善了收敛性能。该算法对输出信号的实部和虚部分别进行非线性变换。最后利用实测的水声信道数据,对这几种算法进行了数值分析研究,结果表明:所提出的算法不仅能够很好地克服相位旋转,而且其收敛速度明显高于MCMA,剩余均方误差更小,而计算量并没有明显的增加。
Based on the analysis of the modified constant modulus algorithm (MCMA), a fast carrier recovery blind equalization algorithm for QPSK (Quadrature Phase Shift Keying) signal is proposed. In this algorithm, an error function that is different from the MCMA algorithm and can converge quickly is constructed, which improves the convergence performance while eliminating intersymbol interference (ISI) and correcting the phase error. The algorithm performs non-linear transformation on the real part and the imaginary part of the output signal respectively. Finally, the numerical analysis of these algorithms is carried out by using the measured underwater acoustic channel data. The results show that the proposed algorithm can not only overcome the phase rotation well, but also converge faster than MCMA and the residual mean square error is more Small, but the calculation did not increase significantly.