Replies to post #317383 on InterDigital Inc (IDCC)

[Gamco]

United States Patent 7,929,409
Chitrapu , et al. April 19, 2011

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Orthogonal frequency division multiplexing (OFDM) method and apparatus for protecting and authenticating wirelessly transmitted digital information


Abstract
A method and apparatus for protecting and authenticating wirelessly transmitted digital information using numerous techniques. The apparatus may be a wireless orthogonal frequency division multiplexing (OFDM) communication system, a base station, a wireless transmit/receive unit (WTRU), a transmitter, a receiver and/or an integrated circuit (IC). The wireless OFDM communication system includes a transmitter which steganographically embeds digital information in an OFDM communication signal and wirelessly transmits the OFDM communication signal. The system further includes a receiver which receives the OFDM communication signal and extracts the steganographically embedded digital information from the received OFDM communication signal.


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Inventors: Chitrapu; Prabhakar R. (Blue Bell, PA), Kaewell, Jr.; John David (Jamison, PA), Olesen; Robert Lind (Huntington, NY), Shin; Sung-Hyuk (Northvale, NJ), Hoffmann; John Erich (Indialantic, FL), Herschaft; Richard Dan (Whitestone, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)

Appl. No.: 11/035,174
Filed: January 13, 2005

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Related U.S. Patent Documents

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Application Number Filing Date Patent Number Issue Date
60536133 Jan., 2004
60536144 Jan., 2004


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Current U.S. Class: 370/208 ; 370/210
Current International Class: H04J 11/00 (20060101)
Field of Search: 370/204,321,208,247,250,205-206 382/100 455/466,456,247,522,574 713/171,172,173,174,193 375/260,140,147

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