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:
May. 13, 1997
Filed:
May. 22, 1995
Marek K Dutkiewicz, Delta, CA;
Philip J Houghton, Surrey, CA;
Sierra Wireless, Inc., Richmond, CA;
Abstract
A method for reducing the effects of transients on the DC off-set tracking stage and the symbol timing recovery stage in a full duplex or half duplex packet switched data communication system-in which transients occur in the receiver portion of the subscriber when the transmitter portion of a subscriber is keyed ON and OFF is described. The method is dynamically implemented such the DC tracking stage and the symbol timing recovery stage are set in a first 'distortion ready' mode during the time that the transmitter is keyed on and off and is set back to a second 'normal' mode after the transmission event is over. In the 'distortion ready' mode, the symbol timing recovery stage is set in a 'freeze' state such that it makes no further timing adjustments to a decision clock that it generates and the DC off-set recovery stage is set to a narrow bandwidth mode such that it does not track large variations in the DC off-set and amplitude in the received signal. As a result, the Tx/on and Tx/off transients do not upset the decision clock synchronization with the forward channel data stream and the DC off-set tracking stage remains stable.