Patent ID: 8526518
Filing Date: 2013-09-03
Classification: H04B,H04L

Abstract:
1. A method for imbalance compensation in a direct conversion receiver system comprising: receiving a signal via an antenna at the receiver from a remote transmitter; amplifying the signal to create an amplified signal; providing the amplified signal to a mixer having a first input and a second input; within the mixer, converting the amplified signal to an imaginary baseband signal and a real baseband signal; converting the imaginary baseband signal and the real baseband signal to a digital format to create an imaginary signal and a real signal; processing the imaginary signal with a receiver quadrature correction module to restore quadrature amplitude and phase accuracy of the imaginary signal to create a receiver corrected waveform; and processing the receiver corrected waveform at the receiver to correct remote transmitter quadrature error introduced by the remote transmitter, the processing of the receiver corrected waveform including dividing one or more receiver imbalance corrected signals by a value, the value being a total of one plus an estimated transmitter amplitude imbalance value and then shifting phase by an estimate of unwanted phase shift.