Radio communications apparatus
First Claim
1. Radio communications apparatus employing a training routine for optimising performance, the apparatus including;
- a modulator for modulating a radio channel with digital information, the modulator having an input for receiving digital data and providing at least one baseband output signal at a first data rate;
a power amplifier for amplifying the at least one output signal fed from the modulator to provide at least one amplified output signal;
a feedback loop for sampling a portion of the at least one amplified output signal provided by the power amplifier and for adjusting at least one of the amplitude and phase of the at least one baseband signal to compensate for distortion introduced by the power amplifier; and
means for reducing the data rate of the at least one baseband signal during the training routine to reduce adjacent channel transmissions.
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0 Petitions
Accused Products
Abstract
A radio communications apparatus employs a training routine for optimizing performance and has a modulator (64, 66) to modulate a radio channel with digital information, to provide baseband signals (I, Q) at a first data rate. A power amplifier (36) amplifies signals fed from the modulator. A feedback loop (40, 42, 44, 30) samples the output signals of the power amplifier and adjusts at least one of the amplitude and phase of the baseband signals to compensate for distortion introduced by the power amplifier. The data rate of the baseband signals is reduced during the training routine to reduce adjacent channel transmissions.
112 Citations
6 Claims
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1. Radio communications apparatus employing a training routine for optimising performance, the apparatus including;
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a modulator for modulating a radio channel with digital information, the modulator having an input for receiving digital data and providing at least one baseband output signal at a first data rate; a power amplifier for amplifying the at least one output signal fed from the modulator to provide at least one amplified output signal; a feedback loop for sampling a portion of the at least one amplified output signal provided by the power amplifier and for adjusting at least one of the amplitude and phase of the at least one baseband signal to compensate for distortion introduced by the power amplifier; and means for reducing the data rate of the at least one baseband signal during the training routine to reduce adjacent channel transmissions. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification