Patent number: 5732333
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.
Type:
Grant
Filed:
February 14, 1996
Date of Patent:
March 24, 1998
Assignee:
Glenayre Electronics, Inc.
Inventors:
Charles Brian Cox, David Kent Bonds, Jay Jui-Chieh Chen, Flaviu C. Costescu, Joel Richard Dierks, Wayne Douglas Duello, Thomas L. Frederick, Paul A. Goud, Derek Stephen Hilborn, Richard Johnathan Hinkle, Terry Lee Hinkle, David E. Jones, Theron Lee Jones, Patricia Fern Kavanagh, David W. Kroeger, Robert Richard Leyendecker, Vladimir Pavlovic, Claudio Gustavo Rey, Ray M.R. Sewlochan, Emre Tapucu, Mark A. Walker
