07515578 is referenced by 141 patents and cites 28 patents.

A method for estimating position using WLAN access point radio propagation characteristics in a WLAN location based service is provided. A location-based services system has a plurality of Wi-Fi access points in a target area. The Wi-Fi access points are positioned at geographic locations and have signal coverage areas. A method of characterizing at least one of the Wi-Fi access points comprises determining the geographic location of the Wi-Fi access point, dividing the signal coverage area of the Wi-Fi access point into at least one section, and determining radio propagation characteristics for each section. The radio propagation characteristics of each section characterize a radio channel of the Wi-Fi access point, and the characterization can be used in a location algorithm.

Title
Estimation of position using WLAN access point radio propagation characteristics in a WLAN positioning system
Application Number
11/430222
Publication Number
7515578 (B2)
Application Date
May 8, 2006
Publication Date
April 7, 2009
Inventor
Kaveh Pahlavan
Newton
MA, US
Farshid Alizadeh Shabdiz
Wayland
MA, US
Agent
Wilmer Cutler Pickering Hale & Dorr
Assignee
Skyhook Wireless
MA, US
IPC
H04Q 7/20
H04Q 7/24
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