Patent · US Expired

Code word detecting method

US4035581A · kind A · utility

3Cited by

8References

18Claims

0Family size

Assignee

Licentia Patent-Verwaltungs-GmbH · DE

Inventors

Wilhelm Milcz · Winnenden, DE
Wolfgang Steinert · Backnang, DE
Bo Ekström · Bunkeflostrand, SE

Key dates

Filing date	Apr 8, 1976
Grant date	Jul 12, 1977
Priority date	—
Expiry date	Apr 8, 1996

Classification

Technology area (CPC H)Electricity
CPC primaryH04L27/2332
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A method for detecting a predetermined code word contained in received signals in a transmission system which operates with a four-phase type of modulation at the transmitter and coherent demodulation at the receiver, the code word being transmitted only as signals in two phases which are 180.degree. apart and the received signals being divided into orthogonal voltage components during demodulation, which method includes selecting that one of the sum and difference of the voltage components which has the larger absolute magnitude value, and evaluating the received signal in accordance with the algebraic sign of that one of the sum and difference which is thus selected.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.