摘要
以采样信号在频率f=1/2T处频谱取最大值为准则,提出一种用于QAM接收机的定时相位迭代估计算法。该方法用数字差分滤波对采样信号进行处理,提高了信号中的定时分量,从而加快了算法的收敛速度。仿真结果表明,该方法缩短了QAM接收机符号同步建立时间,在低信噪比情况下的性能仍良好。
An algorithm of timing phase iteration estimation for QAM receiver is proposed. In this algorithm, the digital differential filtering （DDF） is used to process the sampled signals, the timing component of signal is improved, and therefore the convergence speed is quickened. The experimental results show that the algorithm reduces the setting time of symbol synchronization in QAM receiver and has good performance when SNR is low.
出处
《电视技术》
北大核心
2008年第2期11-13,共3页
Video Engineering
关键词
代价函数
符号定时恢复
数字差分滤波
判决反馈均衡器
cost function
symbol timing recovery
digital differential filtering
decision feedback equalizer
