OFDM软件接收机的符号精确同步  

Fine symbol timing for OFDM soft receiver

作　　者：赵民建[1] 宋征卫[1] 仇佩亮[1] 

机构地区：[1]浙江大学信息与电子工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2005年第8期1111-1115,共5页Journal of Zhejiang University：Engineering Science

摘　　要：提出了一种可用于正交频分复用(OFDM)软件接收机的全数字化内插同步环路.基于前导字进行粗同步估计,并采用数字控制振荡器(NCO)控制的环路对残留符号定时误差和采样频率偏差进行跟踪补偿,以获得精确符号同步.环路设计采用双环结构分别对NCO相位和频率控制字进行跟踪,而误差提取基于OFDM符号中的导频来实现.针对提出的算法结构进行了计算机仿真,结果证明该方法有效.A symbol timing loop for orthogonal frequency division multiplexing （OFDM） soft receiver was investigated and a digital interpolation timing loop for OFDM receiver was proposed. To achieve fine symbol timing, a loop controlled by numerical controlled oscillator （NCO） was used to track the residual timing error and the sampling frequency error after coarse timing acquisition based on a preamble. The phase error and the frequency error of the NCO were tracked by a twin-structure loop, and the errors were acquired by the pilots of OFDM symbols. According to the algorithm, simulation results prove that the loop is effective.

关 键 词：OFDM 符号同步 软件无线电 

分 类 号：TN911.22[电子电信—通信与信息系统]