Positioning Techniques for Narrowband Wireless Signals Under Dense Multipath Conditions

摘要

Techniques and systems for position determination using narrowband signals are disclosed. A disclosed technique includes receiving, at a wireless device, signals that are transmitted at different times, each of the signals having a different carrier frequency and representing a different subchannel of a wireless channel; determining estimated magnitudes of the subchannels based respectively on the signals; determining estimated group delays of the subchannels based respectively on the signals; determining an estimated channel frequency response of the wireless channel based on the estimated magnitudes and the estimated group delays; determining a propagation delay of the signals based on the estimated channel frequency response; and generating position information based on the propagation delay.