GSM系统频率同步的实现

在GSM系统中提出一种简单的频率同步算法,利用系统频率校正信道(FCCH)的信号特征估计接收信号的频率偏移,并通过频率补偿实现系统频率同步.仿真结果表明,该算法丢包率低,信噪比为8 dB时就可完全检测到FCCH;频偏估计和补偿效果好,降低了系统误码率.与传统的基于频域FCCH检测算法和最大似然匹配检测算法相比,所提算法基于时域信号处理,不需进行频域分析,其性能好且简单实用.

Realization of Frequency Synchronization for GSM System

A simple frequency synchronization algorithm is proposed for GSM syst em. It estimates the frequency deviation from the received signal according to t he signal feature of the frequency correction channel(FCCH), and realizes the sy stem f requency synchronization by frequency compensation. Simulation results show that the algorithm has low lost frame rate and can detect all FCCH frames when signa l -to-noise ratio(SNR) is only 8dB and it has good performance in frequency deviat ion esti mation and compensation, the Bit Error Rate(BER) of the system is decreased. C ompared with the traditional frequency based FCCH detection algorithm and ML M atching algorithm, the proposed algorithm is based on time domain signal processing and need no frequency domain analysis,so it is simple and has good performance.