| 摘要 |
Systems, apparatuses and methods are disclosed for estimating a signal travel time, and thus distance between transceivers, in an orthogonal frequency division multiplexing (OFDM) system. The signal travel time is measured between a transmit time (t T ) and a receive window time (t window ) adjusted by the phase delay (T Φ ). The phase delay (T Φ ) is determined as a difference between a receive time (t R ) and the receive window time (t window ). The receive time (t R ) may be determined based on either an amplitude of the received signal at the receive window time (t window ) or when the received signal crosses a positive-negative axis. In synchronous systems, either a one-way time (OWT) or round-trip time (RTT) may be used for estimation. In asynchronous systems, an RTT is used for estimation. |
