一种GMSK的均衡方法

An Equalization Algorithm for the GMSK Signal

针对GMSK信号的一种基于鉴频以后利用FFT变换来进行突发检测和时偏估计的算法,介绍了一种适用于调频信号的均衡方法。由于调频信号经过鉴频器以后得到一个实信号(可以看作是一个近似的二相调制),利用此特性采用基于信道估计(CEQCID)的均衡算法,利用巴克码良好的自相关性来估计信道的特性,采用判决反馈均衡器(DFE)来对信号进行均衡,得到的效果较好。由于将信号转化为实信号,使计算复杂度大大降低。

This paper introduces an equalization algorithm for the frequency-modulation signal on the basis of an algorithm for the GMSK signal of using FFT to detect the burst and estimate the offset of the symbol timing after frequency discrimination. Because a real signal （regarded as a BPSK signal） is obtained after the sampling signal of GMSK passes through the digital frequency discriminator, the algorithm of Channel Equalization via Channel IDentification （CEQCID） is adopted. The estimation of the channel characteristic by using the good self-correlation of the Bark code and the adaptation of Decision Feedback Equalizer （DFE） to equalize the signal guarantee good performance. The transformation of complex signals into real signals greatly reduces the complexity of computation.