基于分布式MIMO网络的室内终端单站定位技术

Indoor terminal localization technology using a single access point based on distributed MIMO networks

针对分布式MIMO网络中的终端定位问题,提出了基于分布式MIMO网络的室内终端单站定位系统。首先,将接入点天线布置在室内不同的位置,并利用压缩感知算法对终端每个天线上接收路径的离开角(AoD)和飞行时间(ToF)进行估计;其次,联合多个路径的AoD和ToF建立非线性定位模型,并利用一种改进的Levenberg-Marquardt算法进行求解;再次,理论分析了定位误差的影响因素以及给出了天线布局的理论依据;最后,利用电磁仿真软件和软件无线电平台进行了仿真和实测验证,仿真和实测结果表明,所提定位系统的性能优于现有基于自然多径辅助的单站定位系统。

Regarding the terminal localization in distributed MIMO networks,an indoor terminal localization system us-ing a single access point(AP)based on distributed MIMO networks was proposed.Firstly,the AP’s antennas were ar-ranged at different locations in the room,and the compressed sensing algorithm was used to estimate the angle of depar-ture(AoD)and time of flight(ToF)of the receiving path on each antenna of the terminal device.Secondly,AoDs and ToFs of multiple paths were combined to establish a nonlinear localization model,and an improved Levenberg-Marquardt algorithm was used to solve the problem.Then,theoretical analysis has been examined for the factors that influence the lo-calization error,and the criteria for the antenna layout was provided.Finally,electromagnetic simulation software was used to build simulation environment and conducted the simulation for system verification.Moreover,software-defined radio platforms were used to conduct practical tests.Both simulation and experimental results indicate that the performance of the proposed localization system is superior to existing single-AP localization systems based on natural multipath.