A Detection Algrithm Based on Joint Time and Frequency Offset Estimation for OFDM in HF Communications
基于时频联合估计的短波OFDM的检测算法

Against the character of HF channels, this paper presents an OFDM synchronization detection scheme, which uses m sequence to modulate the pilot symbols. Based on joint time and frequency-offset estimation, synchronization detection can be implemented using the correlation peak of the m sequence in low SNR. Theoretical analysis shows the right selection of range for decision threshold. Monte Carlo simulation results show the scheme has good performance with a reliable detection probability and a low false alarm probability under low SNR( - 10dB).