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提出了在信号盲均衡处理过程中,同时完成定时误差估计、定时恢复和载波相位恢复的联合处理方法.在修正恒模算法(MCMA)的代价函数中引入定时误差参数,嵌入Farrow结构的插值滤波器,并在均衡器系数更新和定时误差估计的迭代操作中使用一段数据样本,以开环批处理的方式准确估计出代价函数关于均衡器系数向量和定时误差的梯度.理论分析和仿真实验结果表明:算法收敛速度较快,单次运行收敛曲线平滑,适应于短数据样本的处理,在存在定时误差的情况下,仅需数百个数据样点即可实现信号恢复.
A joint processing method of timing error estimation, timing recovery and carrier phase recovery is proposed in the process of signal blind equalization.By introducing the timing error parameters in the cost function of the modified constant modulus algorithm (MCMA), interpolation filtering embedded in Farrow structure And uses a data sample in iterative operation of equalizer coefficient update and timing error estimation to accurately estimate the gradient of cost function on equalizer coefficient vector and timing error by open-loop batch processing. Theoretical analysis and simulation results The results show that the convergence speed of the algorithm is fast, the convergence curve of single run is smooth, and it is suitable for the processing of short data samples. In the presence of timing error, signal recovery can be achieved with only a few hundred data samples.