Patent ID: 7957480
Filing Date: 2011-06-07
Classification: H04L

Abstract:
1. A wireless communication method comprising: generating a first transmission signal including (a) a first pilot signal sequence and a second pilot signal sequence which are allocated to a first frequency and a second frequency symmetrically located in relation to a center frequency of a plurality of frequencies, and (b) a third pilot signal sequence and a fourth pilot signal sequence which are allocated to a third frequency and a fourth frequency symmetrically located in relation to the center frequency; performing quadrature modulation on the first transmission signal with a quadrature modulator, to obtain a first quadrature modulation signal; transmitting the first quadrature modulation signal; performing quadrature demodulation on the first quadrature modulation signal received with a quadrature demodulator, to obtain a first reception signal; extracting, from the first reception signal, the first pilot signal sequence, the second pilot signal sequence, the third pilot signal sequence, and the fourth pilot signal sequence; estimating a first transfer characteristic concerning the first frequency and the second frequency by using the first pilot signal sequence and the second pilot signal sequence; estimating a second transfer characteristic concerning the third frequency and the fourth frequency using the third pilot signal sequence and the fourth pilot signal sequence; generating a third transfer characteristic from which an influence of transmission IQ imbalance in the quadrature modulator is removed by using the first transfer characteristic and the second transfer characteristic; and estimating, from the third transfer characteristic, a reception IQ imbalance characteristic in the quadrature demodulator.