In this monograph, we have shared various novel localization approaches to overcome the detrimental effect of Non line of Sight (NLOS) multipath on the location accuracy in the multipath environment by leveraging on just one reference device (RD) to perform localization on the Mobile device (MD). Firstly, two novel line of sight (LOS) localization algorithms that leverage on the bidirectional joint estimation of Time of Arrival (TOA) and angle of arrival (AOA) at both RD and MD. Only just one RD is sufficient to be in LOS with the MD to peform localization of the MD.The joint Least Square...