Patent · US Expired

Method for jam-resistant communication transmission

US4843612A · kind A · utility

58Cited by

9References

2Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Josef Brusch · Unterhaching, DE
Manfred Hanni · Munich, DE
Kurt Hechfellner · Taufkirchen, DE

Key dates

Filing date	Jun 8, 1981
Grant date	Jun 27, 1989
Priority date	—
Expiry date	Jun 8, 2001

Classification

Technology area (CPC H)Electricity
CPC primaryH04B1/713
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A method for jam-resistant transmission speech signals by radio which have been processed via vocoders, utilizing spread spectrum multiple access modulation (SSMA) or rapid frequency hopping (FH) provides, with respect to the danger of an inherent jamming brought about when a great number of stations simultaneously use the same frequency band for the same radio channel frequency group, activation and deactivation of the transmitter and receiver at the rate of the internal system frame clock pulse during a frame clock pulse period only when useful information is present. In this manner, in the case of simplexcommunication connections, on the average approximately 40% and, in the case of duplex operation, more than 60%, of the transmitting time can be saved, and hence, the inherent jamming of the system can be reduced in a corresponding fashion.

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