一种MC-CDMA系统的时间捕获算法

摘要

A new method to estimate the timing offset in the MC-CDMA system with low SNR and frequency offset is proposed.In this new method,the initial position of timing synchronization is determined by using a special PN sequence,the modulus maximum and the conjugate symmetry of time domain sequence and the peak self-superposability processing method.The simulation is done in the AWGN and the multipath fading channel.In the simulation,the mean and MSE of timing offset are used to estimate the performance of new algorithm.The results show that the new method is effective in contacting noise.%提出了一种估计低信噪比频偏多载波码分多址接入（MC-CDMA）系统定时偏差的新方法,通过采用一个特殊的PN序列,利用得到的时域序列具有的模最大值性和共轭对称性,同时采取峰值自叠加处理方法来确定定时同步起始位置。在高斯和多径衰落信道下进行了仿真,采用定时偏移的均值（mean）和均方误差（MSE）来衡量新算法的性能,验证了新算法的优良性能。