SIGNAL PROCESSOR AND SIGNAL PROCESSING METHOD

摘要

A modulator (radio unit, modulation method) for reducing DC offset and an error of a comparator with a simple structure for accurately compensating a mismatch between an amplitude and a phase of an IQ signal. A modulation signal generated by supplying a test signal to an orthogonal modulator is envelope-detected, and a control part (14) derives an adjustment value and a compensation value based on determination results obtained by further comparing and determining the detection results. Based on the derived compensation value, a means (17) estimates the DC offset and the IQ mismatch of the orthogonal modulator. The test signal includes a first set containing a first test signal (I1, Q1) and a second test signal (I2, Q2) having a predetermined relation with the first test signal, and a second set with in-phase and orthogonal components having a predetermined relation with the first set. The control part (14) acquires the compensation value based on a first adjustment value and a second adjustment value respectively derived corresponding to the first set and the second set.