Algorithm of NLOS Hybrid Location Based on parameters Reconstruction

It is well known that the positioning accuracy in cellular wireless communication systems is largely affected by non-line-sight(NLOS) error, and thus the NLOS error mitigation algorithm has become a hot subject of research in the wireless location field. This paper presents a location algorithm for NLOS environment based on parameters reconstruction. Firstly, the methods of AOA reconstruction to reconstruct the direct angle-of-arrive(AOA) are presented. Then the result of AOA reconstruction is used to reconstruct the direct time-of-arrive(TOA) using maximum likelihood estimation. The algorithm of line-of-sight(LOS) hybrid location is used to estimate the position of mobile station using the reconstructed parameters, and the single base location in the condition of NLOS is implemented with high accuracy. This method does not need LOS or NLOS identification. The traditional model of single target parameter reconstruction is improved. The simulation results show the effectiveness of the algorithm.