频率选择性信道下OFDM帧同步及性能分析

An Algorithm for OFDM Frame Synchronization on Frequency Selective Channel and Performance Analysis

提出了一种正交频分复用(OFDM)帧同步算法,在OFDM帧同步符号时域中使用2个完全相同的序列.考虑到多径信道的分集,提出新的目标函数,使得算法不受频率选择性信道和载波频率偏移的影响,给出了存在帧同步信号和不存在帧同步信号时判决统计量分布的解析形式,理论上得到检测器的漏警概率和虚警概率特性,仿真结果验证了理论分析的正确性.接收端信噪比为20 dB时,给定漏警概率为10^(-10),新算法对应的虚警概率趋于零.

A new OFDM frame synchronization algorithm is proposed, two identical sequences are included in the synchronized symbol. The diversity of multipath channel is considered in the new object function so that performance of the proposed algorithm will be not influenced by frequency selectivity of channel. Analytical form of missing detection and false detection probability of the proposed algo- rithm are given. Numerical simulations validate the analytical results： when the receiver＇s SNR is 20 dB and missing detection probability is 10^- 10, the false detection probability tends to zero in our algorithm.