Title :
Digital on-board multicarrier demodulator for mobile satellite communications
Author :
Alberty, T. ; Björnström, G. ; Eyssele, H. ; Göckler, H. ; Hespelt, V.
Author_Institution :
ANT Narichtentechnik, Backnang, West Germany
Abstract :
The development of an electrical demonstration model of a 32-channel on-board multicarrier demodulator for the return up-link of a (land) mobile satellite communication system is described. Continuous-mode coded speech and data as well as data packets are transmitted at a rate of 9.6 kb/s using filtered QPSK modulation. The implementation is fully digital. The design and obtained performance of the demultiplexer, based on the highly modular and computationally efficient hierarchical multistage method, and the subsequent demodulator are described. Good demodulator acquisition and tracking performance are obtained by the use of parameter estimation techniques and sophisticated frequency, phase and timing control loops.<>
Keywords :
demodulators; mobile radio systems; satellite relay systems; 32-channel demodulator; 9.6 kbit/s; continuous-mode coded speech; data packets; demultiplexer; digital demodulator; filtered QPSK modulation; frequency control loops; hierarchical multistage method; land mobile communication; mobile satellite communications; on-board multicarrier demodulator; parameter estimation techniques; phase control loops; return up-link; timing control loops; tracking performance; Demodulation; Frequency estimation; High performance computing; Modulation coding; Parameter estimation; Quadrature phase shift keying; Satellite communication; Speech; Timing; Tracking loops;
Conference_Titel :
Communications, 1988. ICC '88. Digital Technology - Spanning the Universe. Conference Record., IEEE International Conference on
Conference_Location :
Philadelphia, PA, USA
DOI :
10.1109/ICC.1988.13619
