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.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2005年第8期1111-1115,共5页
Journal of Zhejiang University：Engineering Science
