宽带码分多址信号的戈尔德序列盲识别

Blind identification of gold sequences in wideband code division multiple accesss signals

针对非合作通信中宽带码分多址(Wideband Code Division Multiple Accesss WCDMA)信号的戈尔德(Gold)序列识别问题,提出了基于优选对m序列三阶相关峰的WCDMA信号Gold序列识别方法.根据m序列三阶相关特性,推导得到Gold序列的三阶相关特性;利用m序列的移位叠加性,采用二次延迟相乘方法消除信息码和正交可变扩频因子码对Gold序列识别的影响;最后,利用信号的三阶相关函数识别Gold序列.仿真结果表明:本文算法可以有效识别WCDMA信号的Gold序列,且信号长度越长、信噪比越高,算法的正确识别概率越高.

Aiming at identification of Gold sequences of signals in non-cooperative Wideband Code Division Multiple Access(WCDMA)systems,an identification method of Gold sequences based on the triple correlation peaks of the optimum m-sequences pair is proposed.Characteristics of triple correlation functions of Gold sequences are obtained from analysis of the properties of m-sequences.With utilization of the shift-and-add property of m-sequence,the influence of data sequence and Orthogonal Variable Spreading Factor(OVSF)code is eliminated by using double delay-and-multiply processing.Finally the Gold Sequence is identified through the signal's triple correlation function.Simulation results show that,the Gold sequences of WCDMA signals are identified availably by the proposed method,and the longer the signal's length and the higher signal to noise ratio(SNR),the better the performance of the proposed method.