Title :
MUSYCA: a quasi synchronous CDMA VLSI processor and its application to multiple access
Author :
Ouvry, L. ; Lattard, D. ; Laugeois, M. ; Barletta, J. ; Piaget, B. ; Léquepeys, J.R.
Author_Institution :
CEA-LETI, Grenoble, France
Abstract :
Quasi synchronous CDMA (QS-CDMA) is a quite well known technique which offers both the flexibility of a CDMA (access and resource management techniques) and the capacity of a TDMA system. QS-CDMA is advantageous if the propagation channel is near from line of sight and if the coherence time is high. Hence QS-CDMA has formerly been proposed for GEO satellite and cable modem uplink communication. An implementation of a QS-CDMA digital processor is proposed along with a test platform and performances evaluation. This PHY layer chip is able to handle a large number of simultaneous users, proposes an original connection mechanism and also provides all control information for the MAC layer. It offers a great flexibility due to its high programmability. An application to the uplink of a cable modem is proposed.
Keywords :
VLSI; cable television; code division multiple access; digital signal processing chips; modems; satellite communication; CATV; GEO satellite communication; MUSYCA; QPSK; QS-CDMA; QS-CDMA digital processor; TDMA system capacity; access management; cable modem uplink communication; cable television network; coherence time; multiple access system; performance evaluation; propagation channel; quadrature phase shift keying; quasi synchronous CDMA VLSI processor; resource management; test platform; Artificial satellites; Code division multiplexing; Coherence; Communication cables; Modems; Multiaccess communication; Resource management; Testing; Time division multiple access; Very large scale integration;
Conference_Titel :
Spread Spectrum Techniques and Applications, 2002 IEEE Seventh International Symposium on
Print_ISBN :
0-7803-7627-7
DOI :
10.1109/ISSSTA.2002.1049375
