摘要
提出了基于特殊导频码的OFDM系统的盲帧同步算法。该算法不需要数据辅助,首先利用FFT窗跨界时产生的能量泄露实现了对符号定时参数的估计,然后对同步后的OFDM信号进行解调得到信息序列,最后利用3阶相关函数(TCF)对序列进行处理从而提取出同步码以实现帧同步。仿真结果表明,该算法在低信噪比下具有较好的同步能力和较高的同步精度。
A blind frame synchronization algorithm for OFDM systems based on special pilot code is proposed in this paper. The algorithm does not need training data. Firstly, symbol synchronization is implemented by using the energy leak caused by striding FFT window. Secondly, the information serials are obtained by demodulating the synchronization OFDM signal. Finally, frame synchronization is implemented by collecting synchronization code from the information serials using triple correlation function. The simulation results show that the proposed algorithm has better synchronization probability and higher precision at low SNR.
出处
《微型机与应用》
2014年第3期61-64,共4页
Microcomputer & Its Applications
关键词
正交频分复用
前导码
盲帧同步
3
阶相关函数
OFDM
pilot code
blind frame synchronization
triple correlation function(TCF)
