论文部分内容阅读
该算法通过联合多个正交频分复用(OFDM,Orthogonal Frequency Division Multiplexing)符号对频率偏移进行盲估计。该算法不需要数据辅助,利用接收信号循环前缀的相关性,通过计算相同子信道所传数据的相位差,来实现信号的小数倍频偏估计。利用相邻OFDM符号中频域导频的延迟相关运算来实现整数倍频偏估计。仿真结果表明该算法估计精度高,适合实际信号的应用。
The algorithm blindly estimates the frequency offset by combining multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols. The algorithm does not need data aided, and utilizes the correlation of the cyclic prefix of the received signal, and estimates the fractional frequency offset of the signal by calculating the phase difference of the data transmitted on the same subchannel. The integer frequency multiple frequency offset estimation is realized by the delay correlation operation of the frequency domain pilot in adjacent OFDM symbols. Simulation results show that the algorithm has high estimation accuracy and is suitable for the application of real signal.