Patent ID: 7245885
Filing Date: 2007-07-17
Classification: H03C,H04B,H04L

Abstract:
1. A device for estimating a mismatch of a transmitter comprising: a mismatch compensating unit configured to receive a first in-phase signal and a first quadrature-phase signal, configured to shift, based on a mismatch compensation value, a phase of the first in-phase signal in a first direction and a phase of the first quadrature-phase signal in a second direction, and configured to calculate a third in-phase signal by adding the first in-phase signal to the shifted first quadrature-phase signal in the first direction and a third quadrature-phase signal by amplifying, based on the mismatch compensation value, a value obtained by subtracting the first in-phase signal from the shifted first quadrature-phase signal in the second direction; an up-converter configured to up-convert baseband signals to a radio frequency (RF) signal based on the mismatch compensation value, the baseband signals is including the third in-phase signal and the third quadrature-phase signal; a down-converter configured to mix the RF signal with an oscillating signal to generate a second in-phase signal and a second quadrature-phase signal; and a square unit configured to square the second in-phase signal and the second quadrature-phase signal, configured to add the squared second in-phase signal to the squared second quadrature-phase signal and configured to filter the added value to generate an estimated mismatch value used for determining the mismatch compensation value.