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. 08, 1984
Filed:
Dec. 03, 1981
Pierre R Chevillat, Adliswil, CH;
Gottfried Ungerboeck, Langnau, CH;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A communication method and arrangement are disclosed which provide, for a trellis encoding process in the transmitter and a maximum-likelihood decoding process in the receiver, an additional fifth state (ZS) in addition to the usual four coding states (S0 . . . S3). The fifth state is entered in the transmitter at the end of transmission when a particularly selected escape symbol from a set of four escape symbols (E0 . . . E3) each associated to one of the four normal coding states is sent by an encoder supplement (15). In the receiver, a stop signal indicating end of transmission is only generated when, after the usual decoder delay, a path decoder (63) determines that an escape symbol was received, and a trellis decoder (61) indicates the fifth state (ZS) to be the most probable one. This enables rapid and secure determination of the end of a transmitted sequence without the need for additional transmission symbols or decoder cycles.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile