基于平稳交错正交调制辅助的抗衰落低分辨毫米波定时恢复算法

Anti-fading low resolution millimeter wave timing recovery algorithm based on aid of stationary staggered orthogonal modulation

信号衰落严重时,现有的低分辨毫米波定时恢复算法估计精度不足。针对上述问题,文中提出一种基于平稳交错正交调制辅助的抗衰落低分辨毫米波定时恢复算法。该算法设计了独特的二次重采样数据平稳器以及交错正交调制辅助的抗衰落估计器。二次重采样数据平稳器模块对信号二次重采样,实现对数据的非有理过采样。通过非有理过采样,该模块获得了具有均匀采样抖动的平稳基带信号。交错正交调制辅助的抗衰落估计器推导了平稳低位宽量化信号的定时误差估计公式,通过对平稳的基带信号低通滤波与延迟相关,最终导出定时误差估计值。仿真结果表明,所提算法的均方误差性能优于现有的其他算法,具有较高的定时恢复精度。

The estimation accuracy of the existing low-resolution millimeter wave timing recovery algorithms is unsatisfactory when signal fading is serious.Therefore,an anti-fading low-resolution millimeter wave timing recovery algorithm based on the aid of stationary staggered orthogonal modulation is proposed.In this algorithm,a unique double resampling data stabilizer and an anti-fading estimator assisted by staggered orthogonal modulation are designed.The data stabilizer module resamples the signal twice,so as to realize non-rational oversampling of the data.By non-rational oversampling,the stationary baseband signal with uniform sampling jitter is obtained.The timing error estimation formula of the stationary low bit width quantized signal is derived by the anti-fading estimator assisted by staggered orthogonal modulation.The estimated value of timing error is finally derived by correlating the low-pass filtering of the stationary baseband signal with the delay.Simulation results show that the MSE(mean square error)performance of the proposed algorithm is better than that of the other existing algorithms,and has high timing recovery accuracy.