Method and apparatus for adjusting modulation accuracy of an ort

Details Method and apparatus for adjusting modulation accuracy of an ort Method and apparatus for adjusting modulation accuracy of an ort

1997-05-14

1999-03-23

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375296, 375298, H04L 2736

Patent

active

058865845

ABSTRACT:
A method of adjusting modulation accuracy corrects an I modulation signal and a Q modulation signal without using special hardware when an accurate 90.degree. phase difference between the I modulation signal and the Q modulation signal is not present. The method comprises setting I component correction .DELTA.i for a plurality of phase differences in advance to an I component corrector in accordance with an I signal, which is converted from digital modulation data in a digital data train by a modulator and an IQ converter of a phase error corrector. The method also comprises setting a Q component correction .DELTA.q for a plurality of phase differences in advance to a Q component corrector in accordance with a Q signal, controlling the I component corrector and the Q component corrector by a phase error correction controller, thereby adding the I component correction .DELTA.i and the Q component correction .DELTA.q to the I signal and the Q signal so as to generate a corrected I signal and a corrected Q signal. Thus the phase difference between an I modulation signal and a Q modulation signal is accurately adjusted to 90.degree..

REFERENCES:
patent: 5371481 (1994-12-01), Tiittanen et al.

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