The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 2002
Filed:
Dec. 04, 1998
Hitosi Matui, Tokyo, JP;
NEC Corporation, , JP;
Abstract
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 converts the received burst signal to a base band signal. An AD converter converts an output signal of the quadrature demodulator to a digital signal. A one-cycle delay element makes a delay of an output signal of the AD converter corresponding to one-cycle of the training sequence. A DC-offset detector detects a DC-offset component in the converted signal by the AD converter on the basis of an output signal of the AD converter and an output signal of the one-cycle delay element A subtractor removes the DC-offset component detected by the DC-offset detector from the output signal of the AD converter