InterDigital Inc (IDCC)

[Gamco]

United States Patent 7,881,674
Sugar , et al. February 1, 2011

--------------------------------------------------------------------------------
System and method for antenna diversity using equal power joint maximal ratio combining


Abstract
An equal gain composite beamforming technique which includes the constraint that the power of the signal output by each antenna is the same, and is equal to the total power of the transmit signal divided by the number N of transmit antennas from which the signal is to be transmitted. By reducing output power requirements for each power amplifier, the silicon area of the power amplifiers are reduced by as much as N times (where N is equal to the number of transmit antennas) relative to a non-equal gain composite beamforming technique.


--------------------------------------------------------------------------------
Inventors: Sugar; Gary L. (Rockville, MD), Vaidyanathan; Chandra (Bethesda, MD)
Assignee: IPR Licensing, Inc. (Wilmington, DE)

Appl. No.: 11/879,156
Filed: July 16, 2007

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

Related U.S. Patent Documents

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

Application Number Filing Date Patent Number Issue Date
10800610 Mar., 2004 7245881
10174689 Jun., 2002 6785520
60361055 Mar., 2002
60365797 Mar., 2002
60380139 May., 2002


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

Current U.S. Class: 455/69 ; 455/115.1; 455/127.1
Current International Class: H04B 7/02 (20060101)
Field of Search: 455/522,63.4,67.11,115.1,69,127.1,1,115 370/329,332

PPP