InterDigital Inc (IDCC)

[Gamco]

United States Patent 7,564,808
Schilling July 21, 2009

--------------------------------------------------------------------------------
Spread spectrum communication unit


Abstract
A communication unit comprises a command signal generator for generating a command signal. A transmitter transmits communication signals at one of two frequencies and for transmitting the command signal. A receiver receives communication signals at one of the two frequencies and for receiving the command signal. Upon initiation of the command signal, the command signal is transmitted for receipt by all active units in the system and the unit transmitting the command signal receives communication signals at a selected frequency of the two frequencies and transmits communication signals at another frequency. Upon reception of the command signal from another unit in the system, the unit receiving the command signal transmits a communication signal at the selected frequency of the two frequencies and receives communication signals at the another frequency.


--------------------------------------------------------------------------------
Inventors: Schilling; Donald L. (Sands Point, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)

Appl. No.: 11/429,386
Filed: May 5, 2006

--------------------------------------------------------------------------------

Related U.S. Patent Documents

--------------------------------------------------------------------------------

Application Number Filing Date Patent Number Issue Date
09994290 Nov., 2001 7054278
09878647 Mar., 2002 6356534
09133047 Sep., 2001 6295288
08814809 Jul., 1999 5926465
08268186 Mar., 1997 5610906


--------------------------------------------------------------------------------

Current U.S. Class: 370/261
Current International Class: H04L 12/16 (20060101); H04Q 11/00 (20060101)
Field of Search: 370/328,349,335,342,343,261-263,475,515,478,436,507,511,395,489,496 455/1,456.6,226.4,458,41.2,526,422,506,130,99,345,502,95,96,346,161,456,11 348/725,141 375/206,130,141,222,150,328,271,147 379/77,102,79 340/825 345/685 342/41 386/54 725/136,122,135,139,142