New Algorithms for NLOS Identification

Abstract — A major concern of cellular and PCS-based wireless location systems is the effect of the harsh propa-gation environment, particularly non-line-of-sight (NLOS) propagation. In order to improve location accuracy under such conditions, many NLOS mitigation algorithms utilize the knowledge of wether the base station (BS)- mobile sta-tion (MS) path is line-of-sight (LOS) or non-line-of-sight (NLOS). In this paper we present four algorithms that uti-lize the received power envelope characteristics to to per-form the NLOS identification. I