Abstract: The invention relates to an indoor localization system for a wireless communication network. The system comprises: one or more anchor devices, a central entity, and one or more tag devices. Transmission of signals by the one or more tag devices is controlled so that one signal is transmitted at a time on given radio resource, wherein the tag device transmitting said one signal is the tag device being localized. At least one anchor device is configured to: receive, the signal transmitted by the tag device being localized; determine an estimate of a direction of arrival (DOA) based on the received signal by applying a first power method-based algorithm and a second power method-based algorithm respectively and send the estimated DOA together with DOA metadata to the central entity. The invention relates also to indoor localization methods, an anchor device, a computer program, and a computer readable medium.

Abstract: The invention relates to an anchor device for indoor localization. The anchor device comprises: an antenna array, a radio communicator part comprising at least one RF front end and a radio frequency (RF) switch for each RF front end, and a controller. The anchor device is configured to: receive OFDM signal comprising at least one DOA estimation OFDM symbol transmitted by a tag device being localized, wherein the at least one RF switch is configured to sample the received OFDM signal sequentially from the antenna elements of the antenna array, and wherein the number of the antenna elements is higher than the number of RF front ends times the number of the DOA estimation OFDM symbols; and apply a phase compensated DOA estimation to determine an estimate of the DOA comprising two angles of arrival and to compensate a phase shift caused by the sequential sampling of the received OFDM signal.

Abstract: The invention relates to an indoor localization system for a wireless communication network. The system comprises: one or more anchor devices, a central entity, and one or more tag devices. Transmission of signals by the one or more tag devices is controlled so that one signal is transmitted at a time on given radio resource, wherein the tag device transmitting said one signal is the tag device being localized. At least one anchor device is configured to: receive, the signal transmitted by the tag device being localized; determine an estimate of a direction of arrival (DOA) based on the received signal by applying a first power method-based algorithm and a second power method-based algorithm respectively and send the estimated DOA together with DOA metadata to the central entity. The invention relates also to indoor localization methods, an anchor device, a computer program, and a computer readable medium.