Radio receiver or transmitter and method for reducing an IQ...

Details Radio receiver or transmitter and method for reducing an IQ... Radio receiver or transmitter and method for reducing an IQ...

2007-07-10

2011-12-27

Payne, David C. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S302000, C324S233000

Reexamination Certificate

active

08085863

ABSTRACT:
A radio receiver includes an in-phase channel and a quadrature channel, the channels being provided in parallel at a respective input with quadrature modulated radio frequency signals; and an error correction loop for detecting and correcting an imbalance in gain between at least part of the in-phase channel and a corresponding part of the quadrature channel, wherein the error correction loop comprises: a detector adapted to calculate Error_detnew=|I′|−|Q′|, where I′ and Q′ are the in-phase and quadrature channels respectively; a loop filter arranged to receive Error_detnewfrom the detector and calculate loop_filter_outnew+=Ki* Error_detnew, where Kiis the loop filter constant and loop_filter_outnewhas an initial value of 1; and a multiplier arranged to receive loop_filter_outnewfrom the loop filter and adjust the signal of the quadrature channel by multiplying the signal by loop_filter_outnew.

REFERENCES:
patent: 2002/0097812 (2002-07-01), Wiss
patent: 2003/0231075 (2003-12-01), Heiskala et al.
patent: 2005/0013389 (2005-01-01), Mizukami
patent: 2005/0157815 (2005-07-01), Kim et al.
patent: 2007/0127599 (2007-06-01), Song et al.

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