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:
Jul. 04, 2000
Filed:
Apr. 22, 1996
Hitachi, Ltd., Tokyo, JP;
Abstract
Communication equipment in a slow frequency hopped communication system employing a multi-level quadrature modulation carries out the AGC operation of a receiver amplifier and the operation of synchronizing the received frequency with a carrier frequency during reception of a first field of a preamble field of a communication frame when the carrier is unmodulated, completes the timing recovery of a received symbol and the synchronization with the timing during reception of a second field of the preamble field of the communication frame when the phase of the carrier is changed every symbol time, and thereafter, modulates an information signal in an information transfer field subsequent to the preamble field of the communication frame.