– The software-defined-radio concept received increasing attention due to necessity of multi-mode/multi-system capable terminals for next generation communication systems. This paper summarizes the requirements of a multi-mode compliant digital-front-end (DFE) and describes concepts for cellular terminal implementations on silicon. A partitioning is proposed wherein functionality, normally loca...

Digital predistortion (DPD) technique is widely used to linearize a radio frequency power amplifier (PA). It is the fastest and cost effective digital processing technique to moderate the distortions in PA caused by nonlinearity and memory effects. Digital predistorter is inverse of the PA, so the design of a digital predistorter requires the accurate identification of PA’s behavior. This paper...

We suggest a basic fast algorithm for the noncoherent digital processing of the radio signals consisting of the minimum number of simple arithmetic operations over a signal period. On its basis there can be realized the algorithms and the correspondent digital devices for detection and noncoherent demodulation of signals with amplitude, frequency modulation and differential phase keying. Digita...

Introduction The Great East Japan Earthquake on 11th March 2011 seriously damaged telecommunication networks, which were indispensable to share and collect information for disaster recovery activities. Telecom operators in Japan used various types of transmission media, including communication satellites, to resume services quickly [1]. Radio-wave communications can have agile deployment capabi...

LOPES is a digital radio interferometer which measures the radio emission of extensive cosmic ray air showers. It mainly consists of 30 dipole antennas installed in co-location with KASCADE-Grande at the Karlsruhe Institute of Technology (KIT) in Germany. KASCADE-Grande measures the secondary air shower particles at ground. Whenever KASCADE-Grande detects a high-energy cosmic ray event (& 1016 ...

This series describes a complete PC-based, software-defined radio that uses a sound card and an innovative detector circuit. Mathematics is minimized in the explanation. Come see how it's done. A certain convergence occurs when multiple technologies align in time to make possible those things that once were only dreamed. The explosive growth of the Internet starting in 1994 was one of those eve...