Apparatus for compensating DC offsets, gain and phase...

Details Apparatus for compensating DC offsets, gain and phase... Apparatus for compensating DC offsets, gain and phase...

2007-12-18

2007-12-18

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Receivers

C375S345000, C375S329000, C375S340000

Reexamination Certificate

active

10955759

ABSTRACT:
A quadrature transceiving system for compensating a direct current (CD) offset, a gain imbalance and a phase imbalance between an I-channel signal and a Q-channel in a quadrature transmitting system is disclosed. The quadrature transceiving system includes a transmitter for detecting a DC offset, a gain imbalance and a phase imbalance by using an average of a data aided signals included in a RF transmitting signal and compensating one of the I-channel and the Q-channel based on the detected imbalances and DC offset; and a receiver for detecting a DC offset, a gain imbalance and a phase imbalance by varying loop filter gain and compensating one of the I-channel and the Q-channel based on the detected imbalances and DC offset.

REFERENCES:
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patent: 2006/0039506 (2006-02-01), D'Alessandro
Xinping et al., “Gain/Phase Imbalnce and DC offset compensation IN Quadrature modulators,” Xinping et al., IEEE, 2002, pp. 811-814.
Fred Harris, “Digital Filter Equalization of Analog Gain and Phase Mismatch in I-Q Receivers,” IEEE Int'l Conf. on 5th Univ. Personal Comm., vol. 2, pp. 793-796, Sep. 1996.

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