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:
Mar. 24, 1998
Filed:
Feb. 14, 1996
Charles Brian Cox, Quincy, IL (US);
David Kent Bonds, Quincy, IL (US);
Jay Jui-Chieh Chen, Vancouver, CA;
Flaviu C Costescu, Surrey, CA;
Joel Richard Dierks, Quincy, IL (US);
Wayne Douglas Duello, Quincy, IL (US);
Thomas L Frederick, Liberty, IL (US);
Paul A Goud, Vancouver, CA;
Derek Stephen Hilborn, Nepean, CA;
Richard Johnathan Hinkle, Taylor, MO (US);
Terry Lee Hinkle, Lewistown, MO (US);
David E Jones, Quincy, IL (US);
Theron Lee Jones, Quincy, IL (US);
Patricia Fern Kavanagh, Burnaby, CA;
David W Kroeger, Quincy, IL (US);
Robert Richard Leyendecker, Blaine, WA (US);
Vladimir Pavlovic, Vancouver, CA;
Claudio Gustavo Rey, Coquitlam, CA;
Ray MR. Sewlochan, Vancouver, CA;
Emre Tapucu, Burnaby, CA;
Mark A Walker, Palmyra, MO (US);
Glenayre Electronics, Inc., Charlotte, NC (US);
Abstract
A linear transmitter (101) using predistortion includes a modulator (103), a predistorter (107), a digital quadrature modulator (111), an upconverter (113), a power amplifier (115), and an antenna (117). In addition, the transmitter (101) has a feedback loop including a coupler (119), a downconverter (123), a digital quadrature demodulator (125), and a trainer (131). The digital data to be transmitted is provided into the modulator (103), which converts the digital data into in-phase and quadrature component signals. The in-phase and quadrature component signals are then provided to the predistorter (107), which 'predistorts' the component signals prior to amplification. The digital quadrature modulator (111) converts the component signals into a single analog signal. The upconverter (113) upconverts this signal from the predistorter (107) into the desired frequency of transmission, which is provided to the power amplifier (115) and the antenna (117) for amplification and broadcast. The coupler (119) provides a portion of the amplified signal to the analog downconverter (123), which lowers the frequency of this signal to a range that is easily processed. The signal is then provided to the digital quadrature demodulator (125), which outputs the in-phase and quadrature component signals of the signal. These in-phase and quadrature component signals are provided to the trainer (131) which analyzes them with the output signals from the modulator. The trainer (131) compares these signals and updates the predistorter (107) so that the digital quadrature demodulator (125) output signals are substantially equivalent to the modulator (103) output signals.