SIMO信道下MPSK信号的载波相位盲估计

Blind carrier phase estimation for MPSK signals over SIMO channels

提出了一种SIMO信道下多个MPSK信号的载波相位联合盲估计算法,以提高低信噪比条件下载波相位的估计性能。该算法综合利用多路接收信号以去除调制信息对相位估计的影响,构建与各信号相位相关的多个方程,并最终通过加权最小二乘解算方法完成对信号相位的联合估计。仿真结果表明,与传统的V&V算法相比,本算法在低信噪比条件下具有更加精确的估计性能,并且能够有效降低相位无偏估计的信噪比门限。

In this paper, a joint blind carrier phase estimator is proposed for MPSK signals over single input multiple output （SIMO） channels, which improves the estimation performance at low SNRs. By using all the signals in SIMO channels, the proposed algorithm removes the impact of the unknown data for phase estimation, and composes multiple equations about the phases of signals. Then the solution of the estimation problem is obtained by utilizing weighted least square methods. Simulation results show that at low SNRs, the proposed algorithm outperforms the V＆V algorithm and has lower SNR threshold above which the estimation of the carrier phases remain unbiased.