非周期扩频系统中频率域多径时延估计

Multipath Delay Estimation in Frequency Domain for Aperiodic Spreading Systems

基于频域子空间思想 ,给出了一种适用于非周期扩频系统的多径时延估计方法 .分析了匹配滤波器输出变换到频域后 ,多址干扰项和噪声项在频域中的统计特性及其对估计误差的影响 .理论分析和仿真实验结果表明 ,时延估计的频域处理方法是一种无偏估计 ,且其估计精度远远高于滑动相关方法 .

Based on the idea of frequency domain subspace, a multipath delay estimating method for aperiodic spreading system is proposed. The statistic properties of the multiple access interference term and the noise term in frequency domain are analyzed. The estimation error from the multiple access interference and the noise are also discussed. The theoretical analysis and computer simulations demonstrate that the method is an unbiased estimator and its estimation precision is superior to the sliding correlator.