Method in digital quadrature modulator and demodulator, and digital quadrature modulator and demodulator
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United States of America Patent
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Mar 30, 2004
Grant Date -
Jun 26, 2003
app pub date -
Jan 10, 2003
filing date -
Nov 29, 1996
priority date (Note) -
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Abstract
Method measures imperfections in the digital quadrature demodulator from the amplitude of the output signal of the demodulator quadrature mixer, i.e. from the amplitude of a vector formed by the I and Q channels, are taken, at a rate based on a symbol clock of the demodulator, numerous momentary samples; a direction angle of the demodulator output signal vector corresponding to the samples is divided, on the basis of the voltages of the I and Q channels, into different direction angle sectors; and direction angle sectors or from a nominal value are calculated the magnitudes of the distortions in the demodulator operation. The method advantageously also includes a step wherein the measurement results of the imperfections in the demodulator operation are used for adjusting the operation of the demodulator by generating feedback loops, which correct all the imperfections simultaneously in an iterative manner.
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