Linear transmitter for use in combination with radio communicati

Details Linear transmitter for use in combination with radio communicati Linear transmitter for use in combination with radio communicati

1994-11-29

1997-03-18

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Measuring, testing, or monitoring of transmitter

455126, 330129, H04J 400

Patent

active

056132263

ABSTRACT:
In a linear transmitter (20) for use in combination with a radio communication system of TDMA that has a plurality of radio stations each of which has the linear transmitter, the linear transmitter is supplied with an input signal having a preamble at a first period and an information signal at a second period following the first period. The linear transmitter comprises a switching circuit (21) for supplying a quadrature modulator circuit (14) with the input signal during the first period. The switching circuit supplies the quadrature modulator circuit with a difference signal of a differential amplifier (13) which is supplied with the input signal. A quadrature demodulator (18) quadrature demodulates a transmission signal into a feedback signal having feedback inphase and feedback quadrature components in accordance with a phase adjusted carrier signal which is supplied from a phase adjusting circuit (23). A monitoring circuit (22) monitors a level of the feedback quadrature component during the first period to produce a level monitored signal representative of a monitored level. The phase adjusting circuit adjusts a carrier phase of a carrier signal in accordance with the level monitored signal during the first period to produce a phase adjusted carrier signal. The phase adjusting circuit supplies the phase adjusted carrier signal to the quadrature demodulator.

REFERENCES:
patent: 5066923 (1991-11-01), Gailus et al.
patent: 5134718 (1992-07-01), Gailus
patent: 5381108 (1995-01-01), Whitmarsh et al.
patent: 5483681 (1996-01-01), Bergsten et al.

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