关键词: 正交频分复用, 分数阶傅里叶变换, 载波频率偏差, 采样频率偏差, 符号定时

Abstract: Synchronization for the OFDM system is studied. A synchronization algorithm with low complexity for joint carrier frequency, sampling frequency, and symbol timing is proposed based on the property of LFM convergent energy in fractional Fourier domain. The three kinds of offset are estimated by locating symmetry point caused by LFM inserted in OFDM symbol. The simulation results show that the performance of the proposed algorithm is improved when the LFM length increases and it is better than those of other similar algorithms.

Key words: OFDM, FRFT, CFO, SFO, symbol timing