Optimization of synchronization method at low SNR in GSM systems
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摘要: 为了优化全球移动通信系统中低信噪比环境下的同步算法,采用高斯滤波最小移频键控调制信号的改进同步算法,得到了信号同步成功率对比图.结果表明,在接收端对高斯滤波最小移频键控调制信号先进行相位反旋转,再对其进行符号化,最后应用滑动相关同步过程的同步算法,比传统基于训练序列的滑动相关同步算法成功率高,不但可以大幅提高低信噪比情况下同步成功率,而且简化了门限计算过程.这一结果对信噪比环境下的信号调制具有重要的意义.Abstract: In order to optimize the synchronization algorithm under the low signal-to-noise ratio(SNR) environment in a global system for mobile communication(GSM)system,the improved Gaussian-filtered minimum shift keying(GMSK) modulation signal synchronization algorithm was adopted to obtain the comparison chart of signal synchronization success rate.At the receiving end the phase of GMSK was reversed first,symbolized,and be processed by synchronization algorithm with slide-relative synchronous progress.The results show that the synchronization algorithm has a higher success rate than the traditional algorithm based on the sliding of the training sequence,which can not only improve the synchronization success rate significantly in the low SNR,but also simplify the threshold calculation process.This result means a great significance to the signal modulation in the low SNR environment.
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