US 7,539,172 B2
	System and method for data scrambling to reduce the crest factor in an OFDM waveform
Salvadore Garcia, Jr., Redmond, Wash. (US); Eamonn Gormley, Seattle, Wash. (US); and Elliott Hoole, Redmond, Wash. (US)
Assigned to AT&T Mobility II LLC, Atlanta, Ga. (US)
Filed on Aug. 30, 2004, as Appl. No. 10/929,732.
Application 10/929732 is a continuation of application No. 09/590004, filed on Jun. 08, 2000, granted, now 6,785,258.
Claims priority of provisional application 60/140648, filed on Jun. 23, 1999.
Prior Publication US 2005/0073945 A1, Apr. 07, 2005
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 7/208 (2006.01)

U.S. Cl. 370—344  [375/260]

21 Claims

1. A mobile transmitter configured to transmit an orthogonal frequency division multiplexed (OFDM) waveform, comprising circuitry configured to accept a message including digital data, randomize digital data patterns in the message by combining the digital data with a predetermined scrambling vector to create a randomized message, modulate the randomized message, map the modulated message into OFDM tones, and transmit the OFDM tones.