Joint TOA/AOA positioning algorithm for OFDM

The accuracy of prediction of time of arriva(lTOA) and angle of arriva(lAOA) in wireless indoor positioning is the most important parameter for indoor positioning systems.Orthogonal frequency division multiplexing(OFDM) is an efficient technique for high-speed digital transmission over multipath fading channels.In this paper,a jointed TOA/AOA super-resolution algorithm for OFDM positioning is proposed.Using the obtained channel frequency response(CFR) and the frequency domain received signal on each antenna,a MUSIC super-resolution algorithm is used to recover the time delay and angle of signal arrivals from a mobile device to a base station and/or an access point.Then,the estimated TOA and DOA of the first arrival path(FAP) are used in a proposed hybrid time/direction of arrival position location scheme.In simulations,the OFDM signal with pilot symbols transmission in a multipath fading channel is considered to illustrate the efficiency of the proposed algorithms.Results show that the positioning precision is high enough for actual application,especially in the environment with only one access point and base station.