Patent ID: 9628097
Date: 2017-04-18
CPC Classifications: H03M,H04L

Claim:
1. A method for handling an in-phase and quadrature (“I/Q”) channel mismatch of an I/Q down-converted signal, wherein the method comprises: obtaining a discrete-time complex valued signal r(n) that is based on an analog-to-digital conversion of the I/Q down-converted signal, wherein the obtained discrete-time complex valued signal r(n) is oversampled by a factor of two or more; forming an intermediate signal v(n) that corresponds to the real part of a π/2 frequency shifted version of the obtained discrete-time complex valued signal r(n); applying, on the formed intermediate signal v(n), a procedure for obtaining an estimate of a frequency dependent mismatch of a two-channel time-interleaved analog-to-digital converter (“TI-ADC”) thereby obtaining a TI-ADC mismatch estimate; and estimating and/or compensating the I/Q channel mismatch based on the obtained TI-ADC mismatch estimate.