Considerations in the autocalibration of quadrature receivers

Author

Pierre, J.W. ; Fuhrmann, D.R.

Author_Institution

Dept. of Electr. Eng., Wyoming Univ., Laramie, WY, USA

Volume

3

fYear

1995

fDate

9-12 May 1995

Firstpage

1900

Abstract

This paper develops a calibration procedure for gain and phase imbalances in quadrature receivers. Quadrature demodulation has many applications in communications and array processing. Frequently, the output of the in-phase (I) and quadrature (Q) channels are considered the real and imaginary parts, respectively, of a complex random process which belongs to the Goodman (1963) class. Mismatch in the gain and phase of the I and Q channels results in a departure from this statistical model and a degradation in the performance of subsequent signal processing algorithms. The calibration algorithm presented in this paper estimates the relative imbalance between the I and Q channels, based on data from a sinusoid of known frequency but unknown amplitude and phase

Keywords

Gaussian distribution; array signal processing; calibration; demodulation; receivers; statistical analysis; telecommunication channels; Goodman distribution; I channels; Q channels; amplitude; array processing; autocalibration; calibration algorithm; calibration procedure; communications; complex random process; frequency; gain imbalance; in-phase channels; performance; phase; phase imbalance; quadrature channels; quadrature demodulation; quadrature receivers; signal processing algorithms; sinusoid; statistical model; Amplitude estimation; Array signal processing; Calibration; Degradation; Demodulation; Frequency estimation; Performance gain; Phase estimation; Random processes; Signal processing algorithms;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1995. ICASSP-95., 1995 International Conference on

Conference_Location

Detroit, MI

ISSN

1520-6149

Print_ISBN

0-7803-2431-5

Type

conf

DOI

10.1109/ICASSP.1995.480583

Filename

480583