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:
Nov. 17, 2015
Filed:
Jul. 17, 2014
Electronics and Telecommunications Research Institute, Daejeon, KR;
Byung Jae Kwak, Daejeon, KR;
Electronics and Telecommunications Research Institute, Daejeon, KR;
Abstract
A method and apparatus related to spatial filtering to select target terminals only located at a predetermined distance among a plurality of target terminals, using a propagation delay between an electromagnetic signal and an acoustic signal are provided. A user terminal transmits the acoustic signal to neighboring terminals to select terminals of which distances from the user terminal correspond to a distance from the user terminal to a target terminal among neighboring terminals. The electromagnetic signal is transmitted to the neighboring terminals in a predetermined transmission delay. Response signals are received from neighboring terminals of which distances from the user terminal are within a predetermined range, among the neighboring terminals that have received the acoustic signal and the electromagnetic signal. The neighboring terminals receive the acoustic signal from the user terminal, and receive the electromagnetic signal transmitted in the transmission delay from the user terminal.