正交频分复用信号在强窄带干扰下的同步算法

OFDM frame synchronization for channel with intense arrow-band interference

提出了一种采用PN序列作为正交频分复用(OFDM)信号引导序列的帧同步方法,此方法能够在强窄带干扰或极低信噪比信道中精确地实现帧同步,克服了基于循环前缀的同步算法在强窄带干扰信道中以及在极低信噪比条件下,无法实现精确同步的问题。仿真结果表明,基于PN序列的帧同步算法在信噪比为-5dB条件下仍能够实现精确同步,且具有抗多径效应和抗强窄带干扰的能力。

This paper puts forward a way of achieving the precise frame synchronization of orthogonal frequency division multiplexing (OFDM) signal by means of PN sequences as frame synchronization. The new algorithm based on PN sequences can overcome the drawbacks of the algorithm based on cyclic prefix and get better synchronization in the channel of strong interference and in the case of low SNR. The result of compute simulation indicates that the algorithm of frame synchronization based on PN sequences can make precise synchronization in SNR=-5 dB and also be capable of resisting odd track effects and intense narrow-band interference.