Method and apparatus for compensating I/Q imbalance by using...

Details Method and apparatus for compensating I/Q imbalance by using... Method and apparatus for compensating I/Q imbalance by using...

2007-03-06

2007-03-06

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Receivers

C375S345000

Reexamination Certificate

active

10839383

ABSTRACT:
An apparatus and method for compensating an imbalance of phase and gain between I-channel and Q-channel by using variable loop gains is disclosed. The apparatus includes: a phase error generator for generating a phase error signal by using the I-channel signal and the Q-channel signal; an average value calculator for calculating an average value of the phase error signal; a comparator for comparing the average value with a predetermined threshold; a selector for selecting a loop gain value among a set of loop gains based on the comparison result; a phase imbalance generator for generating a phase imbalance by using the selected loop gain value; and a compensator for compensating the Q-channel signal based on the phase imbalance.

REFERENCES:
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patent: 6925132 (2005-08-01), Song et al.
patent: 7010059 (2006-03-01), Song et al.
patent: 7130359 (2006-10-01), Rahman
“Design and Analysis of an Automatic Gain Control Scheme for High-Speed Satellite Communications”, M. Kim. et al., IEICE Trans. Commun., vol. E83-B, No. 1, Jan. 2000.
“Digital Filter Equalization of Analog Gain and Phase Mismatch in I-Q Receivers”, F. Harris, 0-7803-3300-4, 1996, pp. 793-796.
“I/Q Imbalances Compensation by Using Variable Step-Size Adaptive Loops at Direct Conversion REceiver for SDR H/W Platform”, published by Yun-Jeong Song and Sung-Woong Rha.

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