An Improved Location Algorithm for Mitigating the Influence of the NLOS Propagation

Based on the statistical property of the non-line-of-sight(NLOS)propagation in cellular networks and the line-of-sight(LOS)reconstruction /smoothing algorithm,an improved location method is presented to mitigate the influence of the NLOS propagation.First,the mean and variance of the NLOS propagation delay are estimated using the statistical property of the NLOS propagation delay;and then the measurements of time difference of arrival(TDOA)are modified to estimate the location of mobile station(MS);finally,the locations of the MS of different time are weighted to further mitigate the influence of the NLOS propagation.The simulation results prove that the proposed method can improve the location accuracy of the location algorithm effectively.