PURPOSE: A preamble noise cancellation circuit is provided to cancel nose included in the preamble area of a communication signal. CONSTITUTION: A preamble noise detecting unit(300) eliminates a predetermined reference preamble signal from a reception preamble signal branched from a coupler(200). The preamble noise detecting unit detects preamble noise included in the reception preamble signal. A noise cancelling unit(500) subtracts the preamble noise of the preamble noise detecting unit from the reception preamble signal of the coupler. The noise cancelling unit cancels noise from the reception preamble signal.
