Repeater system and method of receiving a modulated input signal and transmitting a modulated output signal

US6973121B1 · kind B1 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Ernst Eberlein · Erlangen, DE
• Josef Bernhard · Nabburg, DE
• Christian Paul · Rotterdam, NL
• Thomas Von Der Gruen · Kleinsendelbach, DE

Key dates

• Filing date: Mar 16, 1999
• Grant date: Dec 6, 2005
• Expiry date: Mar 16, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L7/0012
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A repeater system for receiving a modulated input signal and for transmitting a modulated output signal comprising a clock oscillator for providing a repeater system clock, a demodulator for demodulating an input signal and a modulator for modulating the demodulated signal to obtain a modulated signal. The demodulator comprises a first mixer, a first controllable oscillator and a feedback circuit, the first controllable oscillator being controlled by a first control value such that the frequency of the demodulated signal approaches a desired value. The modulator comprises a second mixer and a second controllable oscillator, the second controllable oscillator being controlled by a second control value such that the modulated output signal has a predetermined output frequency. A controller derives the second control value.