H - Electricity – 03 – F
Patent
H - Electricity
03
F
H03F 1/32 (2006.01) H03C 3/08 (2006.01) H04B 1/04 (2006.01) H04L 27/36 (2006.01)
Patent
CA 2105375
In a QAM microwave radio communications system an IF (intermediate frequency) input signal (10) is amplified (12) and predistorted (14), and the amplified IF signal is mixed (20) with a local oscillator signal (18) to produce an RF (radio frequency) signal which is amplified in a power amplifier (22) for transmission, the predistortion compensating for non-linearity of the pow- er amplifier. Adaptive phase control of the predistorter is provided by mixing (30) the local oscillator signal with part of the RF signal (24) to produce an IF output signals (32) representing the output of the power amplifier, detecting (45) phase differences between the IF input and IF output signals to produce a phase difference signal, selectively inverting (56) the phase difference signal in dependence upon whether or not an IF signal amplitude exceeds a comparison level, and intergrating (56) the resulting signal to produce a phase control signal for the predistorter.
Harman Stephen George
Mcnicol John Duncan
Na
Nortel Networks Limited
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