室内CDMA用户定位方法研究

Location Method Research for Indoor CDMA Users

提出了一种基于最大似然(ML)法和最小二乘(LS)法的室内CDMA用户定位方法.根据CDMA信号模型和多径信道模型,估计室内用户信号到达已知位置的参考点的幅度衰减系数,然后根据室内传播损耗模型得到用户与参考点的相对距离,再利用参考点位置对用户进行定位.由于参考点可以为固定接收机或已被定位的室内用户,因此本定位方法还适用于多跳通信.本定位方法算法简单,但模拟结果表明却具有较高的定位精度.

A location method for indoor CDMA users based on the least square algorithm and the maximum likelihood algorithm is presented. Based on the signal model and the multipath channel model of CDMA,amplitude attenuation factors of the signals for indoor users arriving at reference points of known locations are estimated. Then the distances between users and reference points are obtained based on the indoor propagation loss model. Therefore the indoor users are located according to the locations of the reference points. Because reference points can be the fixed receiver or located indoor users,this method can also be used for multihop communication. Although this location method uses simple algorithms,the simulation results in high location accuracy.