COMPLEX DISTORTION ESTIMATION METHOD

PROBLEM TO BE SOLVED: To realize distortion estimate and distortion compensation with higher accuracy. SOLUTION: In a known symbol reception timing by channels CH1, CH4, in-phase components r1k, r4k and quadrature components i1k, i4k, of complex distortion are detected by the multiplication with the reciprocal and they are converted into amplitude components A1, A4 and phase components θ1, θ4. Based on them, linear interpolation is carried out to estimate amplitude components A2, A3 and phase components θ2, θ3 of the complex distortion as to channels (CH2, CH3). In a known symbol reception timing by channels CH2, CH3, in-phase components r2k, r3k and quadrature components i2k, i3k of complex distortion are detected by the multiplication with the reciprocal and they are converted into amplitude components A2, A3 and phase components θ2, θ3. Based on them, linear extrapolation is carried out estimate amplitude components A1, A4 and phase components θ1, θ4 of the complex distortion as the channels (CH1, CH4).