公开(公告)号：US20140233624A1

公开(公告)日：2014-08-21

申请号：US13770792

申请日：2013-02-19

Applicant: QUALCOMM INCORPORATED

Inventor： Rayman Wai Pon ,  Dominic Gerard Farmer

IPC: H04W24/00

CPC classification number: H04L27/2665 ,  G01S5/14 ,  H04J3/0682 ,  H04L27/2662 ,  H04L43/0858 ,  H04L43/0864 ,  H04W24/00 ,  H04W56/00

Abstract: 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 (tT) and a receive window time (twindow) adjusted by the phase delay (TΦ). The phase delay (TΦ) is determined as a difference between a receive time (tR) and the receive window time (twindow). The receive time (tR) may be determined based on either an amplitude of the received signal at the receive window time (twindow) 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.

Abstract translation: 公开了用于在正交频分复用（OFDM）系统中估计信号行进时间，以及收发器之间的距离的系统，装置和方法。 在通过相位延迟（TΦ）调整的发送时间（tT）和接收窗口时间（twindow）之间测量信号行进时间。 相位延迟（TΦ）被确定为接收时间（tR）和接收窗口时间（twindow）之间的差。 接收时间（tR）可以基于在接收窗口时间（twindow）处的接收信号的幅度或者当接收信号与正负轴交叉时确定。 在同步系统中，单向时间（OWT）或往返时间（RTT）可以用于估计。 在异步系统中，RTT用于估计。