| 摘要 |
A baseband signal generator (5) generates a baseband signal that is different for each antenna branch. After passing through a switch (6), a corrector for calibration (7), and a DAC (8), the baseband signal is input to a radio wave transmitter (9) for up-conversion, and is transmitted from an antenna (2). A part of a transmission signal is branched by a directional coupler (12), combined by a combiner (13), converted to a baseband signal by a receiver for calibration (14), analog-converted by an ADC (15), and input to an adaptive controller (16) as a feedback signal (fb). The adaptive controller (16) calculates a calibration value (cal) that minimizes the power of an error signal representing a difference between a reference signal (ref) and the feedback signal (fb), and outputs the calibration value to the corrector for calibration (7) to adaptively adjust a corrector for calibration (7). |
