Rapid Coherent Acquisition for PN Sequence UsingOptimum Search Algorithm  

作　　者：宋阳 胡光锐 

机构地区：[1]Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai 200030, P. R.China

出　　处：《Journal of Shanghai University(English Edition)》2005年第4期339-343,共5页上海大学学报（英文版）

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina(GrantNo.60172018)

摘　　要：An optimun search algorithm for the coherent acquisition in direct-sequence spread-spectrum （DSSS） receivers is proposed and analyzed in this paper. The system consists of two major parts： a phase region estimator and a phase alignment detector. We use an auxiliary sequence to correlate the incoming signal in the phase region estimator. Since the cross-correlation value between the auxiliary sequence and the incoming PN signal has linear magnitude, and can provide the direction for the phase updating, an optimum search algorithm, try and error method, can be adopted to obtain the phase region information of the incoming signal. The mean acquisition time is derived through the signal flow graph theory. The time is compared with that of the conventional serial search scheme, and the results show that the proposed scheme can achieve coarse acquisition significantly faster than the conventional scheme.An optimun search algorithm for the coherent acquisition in direct-sequence spread-spectrum （DSSS） receivers is proposed and analyzed in this paper. The system consists of two major parts： a phase region estimator and a phase alignment detector. We use an auxiliary sequence to correlate the incoming signal in the phase region estimator. Since the cross-correlation value between the auxiliary sequence and the incoming PN signal has linear magnitude, and can provide the direction for the phase updating, an optimum search algorithm, try and error method, can be adopted to obtain the phase region information of the incoming signal. The mean acquisition time is derived through the signal flow graph theory. The time is compared with that of the conventional serial search scheme, and the results show that the proposed scheme can achieve coarse acquisition significantly faster than the conventional scheme.

关 键 词：auxiliary signal direct-sequence spread-spectum（DSSS） PN sequence try and error synchronization. 

分 类 号：TN303[电子电信—物理电子学]