Patent · US Expired

Radiotelephone system with the character of a local or auxiliary communications apparatus

US5533030A · kind A · utility

3Cited by

4References

8Claims

0Family size

Assignee

Jenoptik Communications GmbH · DE

Inventors

Reinhard Schiffel · Berlin, DE
Klaus Jackel · Berlin, DE
Bruno Stadler · Berlin, DE
Holger Vogel · Berlin, DE

Key dates

Filing date	Sep 12, 1994
Grant date	Jul 2, 1996
Priority date	—
Expiry date	Sep 12, 2014

Classification

Technology area (CPC H)Electricity
CPC primaryH04W84/14
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A transmission process with specific adaptive properties in an analog or mixed analog-digital transmission system, having a fixed base station and a number of subscriber station independent of one another. Information from the base station is transmitted to the subscriber stations wherein each information channel is converted by suppressed carrier, single-side band modulation to a narrow-band signal. The narrow-band signals are arranged spectrally adjacent one another in a frequency multiplex allocation scheme and are modulated on a carrier set at a higher frequency range using phase or frequency modulation. Each subscriber accesses no more than one of the information channels. Information transmissions from the subscriber stations to the base station is performed using narrow-band radio channels.

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