Gain imbalance compensation for a quadrature receiver in a cordl

Details Gain imbalance compensation for a quadrature receiver in a cordl Gain imbalance compensation for a quadrature receiver in a cordl

1995-12-06

1999-07-27

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

364148, 370203, 375316, H04B 1500

Patent

active

059302860

ABSTRACT:
A cordless telephone system connectable to the public switched telephone network having a base station and one or more handsets communicating with the base station by an RF link using a time division duplex direct sequence spread spectrum quadrature modulation technique, having a gain imbalance compensation system for balancing the gain between the I and Q channels. Gain imbalance estimation is performed as part of a calibration cycle when the handset is in the cradle of the base station. The controller of the unit causes another unit to send a data signal with a frequency error. The baseband receiver performs the operation .vertline.I.vertline.-.vertline.Q.vertline., which is an indication of gain error. The results are stored in an accumulator over a set period of time. The controller reads the accumulator and uses an iterative process, increasing or decreasing the gain link compensation until no gain imbalance error is obtained.

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