基于扩展码滤波法的联合角度-时延估计

针对异步DS-CDMA系统中的多用户环境,本文提出了一种低复杂度的联合角度一时延估计算法。该算法 由时延检测,路径分离及角度估计三部分组成。首先,本文基于扩展码滤波法构造了一个时延估计新测度,并通过搜索该 测度的最大值来检测时延信息;然后,借助时延信息实现路径分离;最后,采用无需特征值分解运算的矩阵点除算法,从 分离的感兴趣信息中快速求取角度信息。算法具有计算量极低,估计精度较高以及自动实现角度与时延匹配等优点。仿真 实验验证了算法的有效必。

Joint Angle and Delay Estimation Based on Generalized Code-Filtering Method

A low-complexity joint angle and delay estimation algorithm is presented for asynchronous DS-CDMA systems under multipath propagations. There are three modules in the algorithm, i.e., delay detection, path separation and angle estimation. First, delays are detected by searching the largest values of the novel delay estimation measurement which is constructed according to the generalized code-filtering method. Then, paths are separated based on the estimated delays. Finally, exploiting element-wise division algorithm, angles are obtained from the signal of interested rapidly for not requiring eigenvalue decomposition operations. The algorithm has the advantages of very low-complexity, relatively high accuracy, as well as automatic pairing of angles and delays. Simulations results confirm the effectiveness of the algorithm.