| 摘要 |
<p>A DC-offset canceller in a receiver of a communication system using a burst signal including a training sequence with a predetermined periodicity at the head thereof is disclosed. In the canceller, a quadrature demodulator (112) converts the received burst signal to a base band signal. An AD converter (113) converts an output signal of the quadrature demodulator to a digital signal. A one-cycle delay element (114) makes a delay of an output signal of the AD converter (113) corresponding to one-cycle of the training sequence. A DC-offset detector (115) detects a DC-offset component in the converted signal by the AD converter (113) on the basis of an output signal of the AD converter (113) and an output signal of the one-cycle delay element (114). A subtractor (116) removes the DC-offset component detected by the DC-offset detector (115) from the output signal of the AD converter (113). <IMAGE></p> |
