Design and Implementation of MC-CDMA Systems for Future Wireless Networks
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Design and Implementation of MC-CDMA Systems for Future Wireless Networks ´ Sebastien Le Nours CNRS UMR IETR (Institut en Electronique et T´el´ecommunications de Rennes), INSA Rennes, 20 avenue des Buttes de Co¨esmes, 35043 Rennes Cedex, France Email: [email protected]
Fabienne Nouvel CNRS UMR IETR (Institut en Electronique et T´el´ecommunications de Rennes), INSA Rennes, 20 avenue des Buttes de Co¨esmes, 35043 Rennes Cedex, France Email: [email protected]
´ Jean-Franc¸ois Helard CNRS UMR IETR (Institut en Electronique et T´el´ecommunications de Rennes), INSA Rennes, 20 avenue des Buttes de Co¨esmes, 35043 Rennes Cedex, France Email: [email protected] Received 28 February 2003; Revised 8 October 2003 The emerging need for high data rate wireless services has raised considerable interest in MC-CDMA systems. In this work, we describe an MC-CDMA system design process for indoor propagation scenarios. The system specifications and simulations are firstly given, and then implementation aspects on a mixed, multi-DSP and FPGA architecture are presented. In order to reduce development cycle, we propose the use of efficient design methodologies to improve development steps such as complexity evaluation, system distribution according to the architecture, and hardware-software code generation. Implementation results of the considered MC-CDMA system are then given. Keywords and phrases: MC-CDMA, multi-DSP-FPGA architecture, codesign methodology, hardware-software distribution.
1.
INTRODUCTION
The European third-generation (3G) terrestrial mobile system under deployment aims at offering a large variety of circuit and packet services and greater capacity compared to second-generation (2G) systems. The evolution from 2G to 3G corresponds to adapting a new air interface but most of all to a change of focus from voice to multimedia. Fourth generation (4G), as for it, will be defined by the ability to integrate heterogeneous networks, especially radio mobile networks and wireless local area networks (WLAN), that is, to offer access to all services, all the time and everywhere [1]. Besides, the rapid growth of Internet services and the increasing interest in portable computing devices are likely to create a strong demand for high-speed wireless data services. Presumably, it is anticipated that systems with a maximum information bit rate of more than 2–20 Mbps in a vehicular environment and possibly 50–100 Mbps in indoor to pedestrian environments will be needed, using a 50–100 MHz bandwidth. Key issues to fully meet these evolution perspectives are based upon the
most efficient use of scarce spectrum resources, and upon the advent of reconfigurable radio conceivable due to the emergence of software defined radio (SDR) equipments [2]. On the one hand, the multicarrier code-division multiple-access (MC-CDMA) modulation scheme has already proven to be a strong candidate as an access technique for broadband cellular systems [3]. Different concepts based on the combination of multicarrier (MC) m
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