Innerhalb des letzten Jahrzehntes haben mobile Kommunikationssysteme ein enormes Wachstum erfahren. Diese Entwicklung wird durch die Einführung neuen Kommunikation Standards unterstützt, die die Audio- und die Datenübertragungsqualität erheblich verbessern. Leider erfüllt jedoch noch immer kein drahtloses Kommunikationssystem alle Erwartungen hinsi...
In high-mobility OFDM (orthogonal frequency division multiplexing) systems, Doppler distortions cause inter-carrier interference (ICI) that may degrade the system performance severely. Solutions to combat these distortions usually result in an extensive amount of signal processing at the receiver, where the favourable properties of the OFDM signal ...
For the use in wireless applications a new versatile data transmission system (receiver / transmitter) has been developed. Typical applications are telecontrol / telecommand links or wireless modems. Using a PLL synthesizer the system offers a large tuning range from 407 to 480 MHz. All important functions are controlled by a built-in microcontroll...
An 8.2 GHz bandwidth monolithic optoelectronic receiver consisting of an MSM photodiode, a transimpedance amplifier, and a 50 omega output buffer has been fabricated using an enhancement/depletion 0.5 mym recessed-gate AlGaAs/GaAs HEMT process. Successful operation at data rates up to 10 Gbit/s has been demonstrated.
