An Overview of Multiuser Detection Techniques for DS-CDMA in the Light of IMT-2000/UMTS

Abstract

Third generation mobile communication systems are currently being developed. The use of DS-CDMA in these systems leads to a multiple access interference limited system. Due to cross-correlation between the codes used for spreading the system performance is degraded. Multiuser detection techniques have been developed to limit the impact of this interference. In this paper an overview of Multiuser detection techniques is given. Interference cancellation receivers, such as decorrelator, MMSE receiver, parallel interference cancellation receiver and successive interference cancellation receiver are discussed. The importance of parameter estimation is stessed and the complexity of different multiuser detection schemes is analysed.

Indexing terms:

• Multiuser detection
• DS-CDMA

Additional information

Notes on contributors

Carl Wijting

Carl S Wijting received the Master of Science degree in Electrical Engineering (with distinction) from Delft University of Technology, Delft, the Netherlands in 1998. In 1999 he joined the research laboratory of KPN Royal Dutch Telecom, where he was actively involved in the standardisation of network architectures for third generation mobile networks in 3GPP, the preparation of the business case for the UMTS license action and the ACTS RAINBOW project, funded by the European Union, studying the integration of IP in third generation mobile communication network. In April 2000 he joined the Center for PersonKommunikation, Aalborg University Denmark on a research project investigating Micro Moblity mechanisms and Quality of Service in wireless IP networks in co-operation with Nokia Research Center, Helsinki, Finland. Simultaneously he is pursuing a doctoral degree at Aalborg University. His research interests include, mobility management, performance analysis of wireless networks and routing algorithms.

Tero Ojanperä

Tero Ojanperä is the Vice President of Nokia Networks, responsible for research, standardization, and technology within IP Mobility Networks at Nokia Networks. He received his MSc degree from the University of Oulu, Finland, in 1991 and his PhD degree from Delft University of Technology, The Netherlands, in 1999. He has been actively involved in developing third generation mobile communication networks and was involved the setting up the FRAMES project in 1995. He was also the leader of the technical area air interface and the multiple access work package in the project that was responsible for the selection of the FRAMES Multiple Access (FMA) scheme. The FRAMES wideband CDMA was the basis for the UMTS WCDMA concept. Dr Ojanperä is co-author of a book Wideband CDMA Third Generation Mobile Communications (Artech House, 1998) and its second edition WCDMA: Towards IP Mobility and Mobile Internet (Artech House, 2001). He has authored several conference and magazine papers as well as a chapter in three books: Wireless Communications TDMA versus CDMA (Kluwer Academic Publishers, 1997) GSM: Evolution towards 3rd Generation (Kluwer Academic Publishers, 1998), and The Mobile Communications Handbook, Second Edition (CRC Press, 1999). Dr Ojanperä is a member of the IEEE and vice chair for the International Communications Conference (ICC) 2001.

Ramjee Prasad

Ramjee Prasad was born in Babhnaur (Gaya), Bihar, India, on July 1, 1946. He is now a Dutch Citizen. He received a BSc (Engg) degree from Bihar Institute of Technology, Sindri, India and MSc (Eng) and PhD degrees from Birla Institute of Technology (BIT), Ranchi, India, in 1968, 1970 and 1979, respectively.

He Joined BIT as a Senior Research Fellow in 1970 and became associate professor in 1980. While he was with BIT, he supervised a number of research projects in the area of microwave communications and plasma engineering. During 1983 to 1988, he was with the University of Dar es Salaam (UDSM), Tanzania, where he rose to the level of professor of telecommunications at the Department of Electrical Engineering in 1986. From February 1988 to June 1999, he was with Telecommunications and Traffic-Control Systems Group, Delft University of Technology (DUT), The Netherlands. Sine June 1999, he is with Aalborg University, Denmark as Co-director of Center of Personal Communication (CPK) and Chair of Wireless Information and Multimedia Group. He is currently involved in the European ACTS project FRAMES (Future Radio Wideband Multiple Access System) as a Project Leader. He is Project leader of several international industrial funded projects. He has published over 300 technical papers and authored two books, published by Artech House, Boston. His current research interest lies in wireless networks, packet communications, multiple access protocols, adaptive equalizers, spread- spectrum CDMA systems, and multimedia communications.

He has served as a member of advisory and program committees of several IEEE international conferences. He has also presented keynote speeches, invited papers, and tutorials on WPMC at various universities, technical institutions, and IEEE conferences. He is the Co-ordinating Editor and Editor-in-chief of the Kluwer International journal of Wireless Personal Communications and also a member of the editorial board of other international journals. He is listed in the US Who's Who in the World. He is a fellow of the IEE, a fellow of the Institution of Electronics & Telecommunication engineers, a senior member of IEEE and a member of NERG (The Netherlands Electronics and Radio Society).