Patent ID: 8611479

Claim:
A method for correcting imbalance errors in a direct conversion receiver comprising: receiving a radio frequency (RF) signal; converting the RF signal to baseband signals; translating the baseband signals to digital signals having a DC offset; applying a DC offset correction to the digital signals having a DC offset to generate first DC offset corrected signals; applying an imbalance correction unit to the first DC offset corrected signals by estimating an error between an average envelope of the first DC offset corrected signals and an average envelope of a second DC offset corrected signals, wherein the imbalance correction unit is fixed at initial imbalance parameter values, and the average envelope of the second DC offset corrected signals at an output of the imbalance correction unit is dependent on the initial imbalance parameter values; and updating the initial imbalance parameter values of the imbalance correction unit based upon the estimated error for correcting amplitude and phase imbalance errors in the first DC offset corrected signals.