The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 05, 2008
Filed:
Oct. 20, 2004
Sinan Gezici, Princeton, NJ (US);
Zafer Sahinoglu, Somerville, MA (US);
Sinan Gezici, Princeton, NJ (US);
Zafer Sahinoglu, Somerville, MA (US);
Mitsubishi Electric Research Laboratories, Inc., Cambridge, MA (US);
Abstract
A method estimates a distance between transceivers in a wireless communications network. A first time interval T is set in a transmitter and a receiver. A signal is transmitted from the transmitter to the receiver at a time taccording to a first clock of the transmitter. The signal is received in the receiver at a time t. Processing delays of the receivers are determined. A reply to the signal is sent from the receiver to the transmitter at a time tsuch that |t−t|=T. The reply is received in the transmitter at a time tof the first clock and a distance d between the transmitter and the receiver is determined according to d=c(|t−t|−T)/2, where c is the speed of light.