Patent ID: 7885360
Filing Date: 2011-02-08
Classification: H04L

Abstract:
1. A wireless communication apparatus comprising: a receiver to receive an quadrature modulated signal; a generation unit configured to generate a first local signal having a frequency different from a center frequency of the quadrature modulated signal; a quadrature demodulation unit configured to perform quadrature demodulation on the quadrature modulated signal by using the first local signal, to obtain an I channel signal and a Q channel signal; a Fourier transform unit configured to perform Fourier transform on the I channel signal and the Q channel signal, to obtain signals in a frequency domain; and a first calculation unit configured to calculate a first correction coefficient for correcting phase distortion and amplitude distortion caused by the quadrature demodulation by using pairs of signals among the signals, each of the pairs are located at symmetrical frequency positions with respect to the frequency of the first local signal; wherein if a frequency band higher than the quadrature modulated signal is not used, the generation unit generates the first local signal having the frequency higher than the center frequency, and the first calculation unit calculates the correction coefficient based on lower side band signal of the quadrature modulated signal.