摘要
该文给出了一种QAM信号载波频偏估计算法。该算法先采用辅助数据和接收序列相乘后再进行相关运算提取出载波频偏信息 ,然后用相关序列的相位增量获得频偏估值 ,为了提高估值精度 ,对估值序列进行加权处理。该算法具有频偏估计范围大、估值准确度高的特点。计算机仿真表明频偏估计范围可达 0 .4符号率 。
This paper presents an estimation algorithm for the carrier frequency deviation of quadrature amplitude modulation signals. The received data is first multiplied by the aided data, and then the frequency deviation information is extracted by the self correlation of resulting data. The frequency deviation estimation can be obtained from the phase increment of the self correlation sequence. A weight sequence is used to improve the estimation accuracy. The algorithm features the large estimation range for carrier frequency deviation and high estimation accuracy. The simulation results show that its frequency deviation estimation range is up to ±40 % of the symbol rate and its accuracy is close to CRB(Cramer Rao Bound).
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2003年第2期156-158,163,共4页
Journal of Nanjing University of Science and Technology
关键词
数字通信
正交幅度调制
载波频偏估计
digital communications,quadrature amplitude modulation, carrier frequency deviation estimation
