Patent Document ID: 8681846
Application ID: 13887153
Patent Flag: 1

Claim One:
1. A computer-implemented method for estimating I/Q impairment information associated with a sampled complex signal produced by a receiver, the method comprising: (a) computing 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 having an isolated 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 a transform value C Q at frequency f of a Q component of the sampled complex signal; (c) performing one or more of: computing 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; and computing 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.