| 摘要 |
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.
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