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. 18, 1999
Filed:
Feb. 04, 1997
Sony Corporation, Tokyo, JP;
Sony United Kingdom Limited, Weybridge, GB;
Abstract
A radio receiver for a digital cellular system or the like corrects a doppler frequency shift with a simple arrangement. A phase difference of received data I,Q is corrected by generating an estimated signal EXn through estimation of the received data I,Q corresponding to transmitted data y estimated for the maximum likelihood by a maximum likelihood determination circuit 25, by detecting the branch metric BM, BM+, or BM- in which the estimated data is in phase with the received signal, or in the leading or trailing phase to the received signal, respectively, by detecting the phase difference of the received data I,Q from the estimated signal EXn based on the result of comparison of the branch metrics BM+, BM, and BM-, and by correcting the phase difference based on the result of detection of the phase difference.