Patent Number: 6,307,902

Title: Gain imbalance compensation method and apparatus for a quadrature receiver

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.

Inventors: Walley; John Stuart (Lake Forest, CA)

Assignee: Conexant Systems, Inc.

International Classification: H03G 3/30 (20060101); H04L 027/08 ()

Expiration Date: 10/23/2018