Method for protected radio signal transmission

US5168506A · kind A · utility

Assignees

• Siemens Aktiengesellschaft · DE
• Standard Elektrik Lorenz AG · DE

Inventors

• Norbert Erbes · Karlsruhe, DE
• Kurt Hechfellner · Taufkirchen, DE
• Herbert Baumann · Uppsala, SE

Key dates

• Filing date: Aug 5, 1985
• Grant date: Dec 1, 1992
• Expiry date: Aug 5, 2005

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B2001/71566
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

In radio operation in tactical use, an increased jamming resistance with respect to intentional jamming is required. For protection against intentional jamming, frequency hopping techniques have proven very advantageous in which the signals are transmitted in the form of successive error-protected signal blocks where each signal block is transmitted on a different radio carrier frequency which changes in a pseudo-random manner. With this technique, phase shifts can occur which are greater than half a bit and therefore make analysis of the signal blocks difficult or impossible. It is proposed herein that each received signal block be checked after regeneration in a regenerative repeater, controlled by a bit clock pulse, as to its correct block phase and therefore, respectively, newly establish the block clock pulse phase required for further accurate processing of a signal block.