Patent ID: 9686103
Date: 2017-06-20
CPC Classifications: H04L

Claim:
1. A method for compensating the frequency dependent phase imbalance in a receiver, the receiver downconverting an input signal to generate a signal r(t), the signal r(t) having an in-phase component r I (t) and a quadrature component r Q (t), the method comprising: applying a first test signal with a first carrier frequency as the input signal of the receiver to obtain a first phase imbalance between the in-phase component and the quadrature component of the signal r(t) corresponding to the first test signal; applying a second test signal with a second carrier frequency as the input signal of the receiver to obtain a second phase imbalance between the in-phase component and the quadrature component of the signal r(t) corresponding to the second test signal; obtaining a IQ delay mismatch Δt of the receiver according to the difference of the second phase imbalance and the first phase imbalance and the difference of the second carrier frequency and the first carrier frequency; and compensating the in-phase component r wherein the second carrier frequency is different from the first carrier frequency.