一种抗频偏的频域均衡及信号解调算法  

A Frequency Domain Equalization and Signal Demodulation Algorithm Against Frequency Offset

作　　者：宋青平 高军军 余跃 SONG Qing-ping;GAO Jun-jun;YU Yue(Science and Technology on Information Systems Engineering Laboratory,Beijing Institute of Control and Electronic Technology,Beijing 100038,China)

机构地区：[1]北京控制与电子技术研究所信息系统工程重点实验室,北京100038

出　　处：《计算机仿真》2023年第5期239-243,共5页Computer Simulation

摘　　要：针对无线信号传输过程中多径干扰和多普勒频偏并存的问题,提出了一种均衡和解调一体化的频率补偿的单载波频域均衡(SC-FDE)算法,对接收信号下变频和捕获后,先进行频率精确估计和补偿,再进行基于训练序列的插值法信道估计,然后通过均衡系数的计算、快速傅里叶变换(FFT)和快速傅里叶逆变换(IFFT)运算以完成频域均衡和符号判决,补偿了多径带来的影响,最终恢复出了发射端的原始符号。仿真结果表明,在信号接收端,该算法能够克服多普勒效应和多径衰落信道的影响,将散乱错误的星座图纠正为正常状态并最终正确解调出原始信号,因此有着较高的应用价值。Aiming at the coexistence of multipath interference and Doppler in wireless signal transmission,a fre-quency compensation single carrier frequency domain equalization(SC-FDE)algorithm integrating equalization and demodulation is proposed in this paper.After the received signal is down converted and captured,the frequency is ac-curately estimated and compensated,and then the interpolation channel estimation based on the training sequence is carried out.Then,the frequency domain equalization and symbol decision are completed through the calculation of e-qualization coefficient,fast Fourier transform(FFT)and inverse fast Fourier transform(IFFT)operations,which compensates the influence of multipath,and finally recovers the original symbol at the transmitter.The simulation re-sults show that at the signal receiver,the algorithm can overcome the influence of Doppler effect and multipath fading channel,correct the scattered and wrong constellation to the normal state,and finally demodulate the original signal correctly,so it has high application value.

关 键 词：频域均衡 信号解调 频率估计 信道估计 多径干扰 

分 类 号：TN802[电子电信—信息与通信工程]