Quadrature modulator having circuit for correcting phase error

Details Quadrature modulator having circuit for correcting phase error Quadrature modulator having circuit for correcting phase error

1992-11-09

1994-10-11

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

332123, 332144, 375 39, 375 57, 375 60, 375 67, 455 63, 455110, H03C 340, H04L 2720

Patent

active

053551010

ABSTRACT:
A quadrature modulator substantially completely compensating a phase error existing between two quadrature carriers by calculating two corrected baseband signals. One corrected baseband signal is generated by adding a common phase component signal and an orthogonal phase component signal after multiplying the common phase component signal and the orthogonal component signal by a first factor a and a second factor b respectively. The other corrected baseband signal is generated by adding the orthogonal phase component signal and the common phase component signal after multiplying the orthogonal component signal and the common phase component signal by the first factor a and the second factor b respectively. The output signal Z of the quadrature modulator is generated by adding both the outputs X and Y of first and second modulating circuits each modulating a respective carrier by a respective corrected baseband signal. If the phase error is .alpha., the phase error is compensated by adopting the multiplying factors, for example, a=cos (.alpha./2) and b=sin (.alpha./2). In this case, output signal Z is expressed as Z=cos .alpha..multidot.cos (.omega.t+.phi.(t)+.alpha./2), which is free from an image signal.

REFERENCES:
patent: 4890301 (1989-12-01), Hedberg
patent: 5111155 (1992-05-01), Kente et al.

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