Linear transmitter using predistortion

Details Linear transmitter using predistortion Linear transmitter using predistortion

1996-02-14

1998-03-24

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With feedback of modulated output signal

455129, 330149, 375296, H04B 104, H03F 126

Patent

active

057323330

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.

REFERENCES:
patent: 4291277 (1981-09-01), Davis et al.
patent: 4591800 (1986-05-01), Opas
patent: 4700151 (1987-10-01), Nagata
patent: 4879519 (1989-11-01), Myer
patent: 4890300 (1989-12-01), Andrews
patent: 5023937 (1991-06-01), Opas
patent: 5049832 (1991-09-01), Cavers
patent: 5105164 (1992-04-01), Fisher et al.
patent: 5132634 (1992-07-01), Suarez
patent: 5134718 (1992-07-01), Gailus
patent: 5148448 (1992-09-01), Karam et al.
patent: 5193224 (1993-03-01), McNicol et al.
patent: 5249201 (1993-09-01), Posner et al.
patent: 5262734 (1993-11-01), Dent et al.
patent: 5418818 (1995-05-01), Marchetto et al.
patent: 5420536 (1995-05-01), Faulkner et al.
patent: 5430416 (1995-07-01), Black et al.
patent: 5507014 (1996-04-01), Wray et al.

Affiliated with

Also associated with

Rating

Linear transmitter using predistortion does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Linear transmitter using predistortion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linear transmitter using predistortion will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2298553