Patent Document ID: 20140204989
Application ID: 14220364
Patent Flag: 0

Claim One:
1. A method for estimating I/Q impairment information associated with a sampled complex signal produced by a receiver, the method comprising: (a) computing, by digital circuitry, a transform value C I at frequency f of an I component of the sampled complex signal, wherein the sampled complex signal is a baseband signal produced by the receiver in response to the receiver being stimulated with a stimulus signal including a tone at displacement frequency f and a void interval at displacement frequency −f, wherein displacement frequencies f and −f are displacements with respect to a local oscillator frequency of the receiver; (b) computing, by the digital circuitry, a transform value C Q at frequency f of a Q component of the sampled complex signal; (c) performing one or more of: computing, by the digital circuitry, a gain imbalance g of the sampled complex signal at frequency f based on magnitudes of the values C I and C Q , wherein the gain imbalance g includes a gain imbalance of the receiver; or computing, by the digital circuitry, a phase skew φ of the sampled complex signal at frequency f based on phases of the values C I and C Q , wherein the phase skew φ includes a phase skew of the receiver; wherein data including the gain imbalance g and/or the phase skew φ is usable to at least partially correct I/Q impairments of the receiver.