Linear transmitter using predistortion

US5732333A · kind A · utility

Assignee

• Glenayre Electronics, Inc. · US

Inventors

• Charles Brian Cox · Quincy, US
• David Kent Bonds · Quincy, US
• Jay Jui-Chieh Chen · Vancouver, CA
• Flaviu C. Costescu · Surrey, CA
• Joel Richard Dierks · Quincy, US
• Wayne Douglas Duello · Hamilton, US
• Thomas Frederick · Liberty, US
• Paul Andrew Goud · Calgary, CA
• Derek Hilborn · Ottawa, CA
• Richard Johnathan Hinkle · Taylor, US
• Terry Lee Hinkle · Lewistown, US
• David E. Jones · Layton, US
• Theron Jones · White Heath, US
• Patricia Fern Kavanagh · Burnaby, CA
• David Kroeger · Quincy, US
• Robert Leyendecker · Austin, US
• Vladimir Pavlovic · Melrose, US
• Claudio Gustavo Rey · Chandler, US
• Ray M.R. Sewlochan · Vancouver, CA
• Emre Tapucu · Los Gatos, US
• Mark A. Walker · Stafford, GB

Key dates

• Filing date: Feb 14, 1996
• Grant date: Mar 24, 1998
• Expiry date: Feb 14, 2016

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B2001/0425
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

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…