Polar coordinate transmitter

Abstract

The present invention provides a polar coordinate transmitter capable of compensating integer time delay and fractional time delay under the condition of low clock frequency to realize high rate requirement, that is, without increasing the sampling rate, including a polar coordinate generation unit, an amplitude modulation unit, a phase Modulation unit, switching power amplifying unit, delay estimation unit, variable fractional delay filter, and delay estimation unit are used to estimate the integer delay of the phase channel and the amplitude channel in the time domain respectively, after integer delay compensation , respectively estimate the fractional delay of the phase channel and the amplitude channel in the frequency domain; finally, add the integer delay error and the fractional delay error between the phase channel and the amplitude channel to obtain the delay error, and according to the obtained delay error to set the variable fractional delay filter; the variable fractional delay filter is used to delay the signal input to the phase channel, and to compensate the delay error between the phase channel and the amplitude channel.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to the delay compensation technology of a transmitter. Background technique [0002] Polar transmitter combines power modulation technology and switching power amplifier technology. The polar coordinate transmitter includes a polar coordinate generation unit, an amplitude modulation unit, a phase modulation unit, a switching power amplification unit, and a polar coordinate generation unit, which are used to send the generated digital amplitude information to the amplitude modulation unit, and send the generated digital phase information to the The phase modulation unit; the phase modulation unit is used to convert the digital phase information into an analog signal, and generates a phase modulation signal with a constant envelope of radio frequency through phase modulation and outputs it to the input end of the switching power amplifying unit; the amplitude modulation unit is use...

AI Technical Summary

Problems solved by technology

However, the fractional delay requires interpolation processing or increased sampling rate, which has high processing complexity and greatly increases the complexity of correcting delay errors.

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