摘要
给出了一种高阶QAM信号载波频偏估计算法。该算法先采用非数据辅助频偏估计器估算出一个粗略的频偏,并进行补偿,然后对补偿信号用非数据辅助频偏估计器进行频偏估计,并把两者的频偏估计进行相加。最后为了提高估计精度,对估计出来的频偏进行Kalman滤波,并得出精确的频偏估计。该算法具有频偏估计范围大、估计准确度高的特点。计算机仿真表明频偏估计范围可达0.5符号率,估计精度接近克拉美-罗限。
An algorithm for high order QAM carder frequency offset estimation is presented. This algorithm adopts non- data- aided frequency estimator to estimate a cursory frequency offset firstly, and then compensates and estimates it by the other frequency offset estimator, and then gets a precise frequency offset by adding them. In order to get a more precise frequency ,Kalman filter is kerforned for the estimated frequency offset. This algorithm has characteristics of large frequency acquisition range and high estimation precision. Computer smulations indicate that with this algorithm the estimation range can reach 0. 5 symbol rate and estimation precision is near to Cramer - Rao bound （CRB）.
出处
《电讯技术》
2006年第4期144-149,共6页
Telecommunication Engineering
