Invention Grant
- Patent Title: Direction finding and FTM positioning in wireless local area networks
-
Application No.: US15121049Application Date: 2015-02-24
-
Publication No.: US10484814B2Publication Date: 2019-11-19
- Inventor: James June-Ming Wang , Jianhan Liu , Thomas Edward Pare, Jr. , Tianyu Wu , Gabor Bajko , Yung-Ping Hsu
- Applicant: MEDIATEK INC.
- Applicant Address: TW Hsin-Chu
- Assignee: MEDIATEK INC.
- Current Assignee: MEDIATEK INC.
- Current Assignee Address: TW Hsin-Chu
- Agent Winston Hsu
- International Application: PCT/US2015/017391 WO 20150224
- International Announcement: WO2015/130712 WO 20150903
- Main IPC: H04W4/021
- IPC: H04W4/021 ; H04W64/00 ; G01S5/02 ; G01S5/06 ; H04W4/02 ; H04W24/10 ; H04L5/00 ; G01S5/12 ; G01S3/14 ; G01S3/74 ; G01S13/82 ; H04W4/33 ; G01S1/08 ; H04W84/12 ; H04W4/04

Abstract:
A method of combined direction finding (DF) and fine timing measurement (FTM) positioning in a wireless location area network (WLAN) is proposed. A multiple antenna IEEE 802.11 transmitting device (AP) can transmit signal preamble containing multiple Long Training Field (LTF) symbols in a radio frame from multiple antennas, which allows a receiving device (STA) to resolve multiple DF sounding signals transmitted from the multiple antennas and thereby estimating angle of departure (AoD). On the other hand, the AP can estimate angle of arrival (AoA) from radio signals transmitted from the STA. When the radial resolution error of AoD or AoA positioning increases, DF positioning and fine-timing measurement (FTM) ranging can be jointly applied to reduce the radial resolution error and extends the AoD/AoA service area with positing accuracy.
Public/Granted literature
- US20160366548A1 DIRECTION FINDING AND FTM POSITIONING IN WIRELESS LOCAL AREA NETWORKS Public/Granted day:2016-12-15
Information query