Patent Document ID: 20130223499
Application ID: 13442573
Patent Flag: 0

Claim One:
1. A computer-implemented method for computing I/Q impairments at a complex output of an electrical system based on I/Q impairments at a complex input of the electrical system, the method comprising: computing a spectrum A(f) according to the expression 
 H ( f )(1 +g ( f ) exp ( j φ( f )), where H(f) is a spectrum of a linear system model of the electrical system, wherein g(f) is a gain imbalance at the complex input, wherein φ(f) is a phase skew at the complex input; computing a spectrum B(f) according to the expression 
 H (− f )(1 −g ( f ) exp (− j φ( f )); computing a sum of the spectra A(f) and B(f), and a difference of the spectra A(f) and B(f); computing a gain imbalance and phase skew at the complex output based on real and imaginary parts of the sum, and real and imaginary parts of the difference; and storing the computed gain imbalance and phase skew in a memory.