Patent · US Expired

Method of and arrangement for transmitting messages in a digital radio transmission system

US4697260A · kind A · utility

69Cited by

4References

13Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Christoph Grauel · Feucht, DE
Ludwig Kittel · Heroldsberg, DE
Werner Schmidt · Chemnitz, DE
Ulrich Wellens · Heroldsberg, DE

Key dates

Filing date	Dec 17, 1985
Grant date	Sep 29, 1987
Priority date	—
Expiry date	Dec 17, 2005

Classification

Technology area (CPC H)Electricity
CPC primaryH04W88/08
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A method and apparatus for use in a digital radio transmission system comprising stationary radio stations arranged in a cellular network and to which are assigned a plurality of mobile radio stations. Transmission of digital messages from a stationary radio station to the mobile radio stations assigned to it is effected by wide-band code division multiplex modulation, and transmission of digital messages from such mobile radio stations to the stationary radio station is effected by narrow-band frequency multiplex modulation. This reduces bandwidth requirements and improves the signal-to-noise ratio for each direction of transmission.

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