一种适于数字音频广播系统的定时同步方案

A timing synchronization scheme for digital audio broadcasting systems

以数字音频广播系统为背景,提出了一种新的符号定时同步方案.它首先通过能量比值检测实现粗定时,然后利用时域相位参考信号良好的自相关性通过移动相关完成细定时.与传统方案相比,它能在保证系统性能的同时,大大降低系统对缓存及控制部分的要求,并且实现简单、灵活性高,因而是一种非常有效的定时同步方案.

Symbol timing errors greatly affect the performance of OFDM systems. In this paper, a new symbol timing synchronization scheme is proposed for digital audio broadcasting systems. With this scheme, coarse symbol timing synchronization is performed by detecting the maximum value of the energy ratio of blank symbols in digital audio broadcasting（DAB） signals, and then fine symbol timing synchronization is accomplished by moving correlation of the phase reference signals in the time domain. Compared with conventional schemes, the proposed scheme does not need complex FFT/IFFT operations and so substantially reduces the requirements of system buffers and control units, while system performance remains unchanged. Therefore it is a simpler, yet equally effective scheme for timing synchronization.