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:
Dec. 31, 2002
Filed:
May. 14, 1999
Edwin Ray Twitchell, San Jose, CA (US);
Harris Corporation, Melbourne, FL (US);
Abstract
In a digital broadcast transmission system ( ), a power amplifier ( ) amplifies an information signal to a power level suitable to excite an antenna to emit a broadcast signal. Prior to, an subsequent to, the amplification processing circuitry ( ) processes the signal. In particular, the information signal is bandpass filtered. The power amplifier ( ) causes non-linear distortion to the information signal. The processing circuitry ( ) causes linear distortions to the information signal. A single, memoryful filter ( ) pre-distorts the information signal to compensate for all of the linear and non-linear distortions. Preferably, the memoryful filter ( ) is a volterra filter. In another embodiment, a memoryful filter ( ) pre-distorts an information signal to compensate for linear distortion from a power amplifier ( ) and non-linear distortion from pre-amplification processing circuitry ( ). Linear distortion from post-amplification processing circuitry is compensated by a linear equalizer ( ). For each embodiment, the number of compensation steps is reduced compared to a sequence in which separate compensation occurs.