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为提高正交频分复用(OFDM)在低信噪比环境下的同步性能和抗噪能力,提出了一种并行多延时相关帧同步算法。该算法充分利用帧的前导训练符号周期重复的特点,在接收端滑动窗中并行处理多种延时相关运算,通过阈值判决进行帧检测,同时完成载波频率同步,进而实现OFDM帧同步。该算法无须改动现有系统的物理帧结构,也不增加系统延时。理论分析和在加性G auss白噪声信道下的误帧率(FER)性能仿真证明:该算法的误帧率约为现有参考方案的1/10,信噪比(SNR)比参考方案提高约7 dB,能够工作在信噪比小于-1 dB的环境。
In order to improve the synchronization performance and anti-noise ability of Orthogonal Frequency Division Multiplexing (OFDM) in low signal-to-noise ratio environment, a parallel multi-delay correlation frame synchronization algorithm is proposed. The algorithm makes full use of the repetitive characteristics of the leading training symbol in the frame, processes multiple delay-related operations in parallel in the sliding window at the receiving end, performs frame detection through the threshold decision, and simultaneously completes the carrier frequency synchronization to achieve OFDM frame synchronization. The algorithm does not need to change the physical frame structure of the existing system, and does not increase the system delay. Theoretical analysis and frame error rate (FER) performance simulation under additive G auss white noise channel show that the frame error rate of this algorithm is about 1/10 of the existing reference scheme and SNR is higher than that of the reference scheme About 7 dB, can work in the SNR less than -1 dB environment.