, Volume 35, Issue 1-2, pp 19-33

Channel Capacity of TDD-OFDM-MIMO for Multiple Access Points in a Wireless Single-Frequency-Network

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The multiple-input-multiple-output (MIMO) technique is the most attractive candidate to improve the spectrum efficiency in the next generation wireless communication systems. However, the efficiency of MIMO techniques reduces in the line of sight (LOS) environments. In this paper, we propose a new MIMO data transmission scheme, which combines Single-Frequency-Network (SFN) with TDD-OFDM-MIMO applied for wireless LAN networks. In our proposal, we advocate to use SFN for multiple access points (MAP) MIMO data transmission. The goal of this approach is to achieve very high channel capacity in both LOS and non line of sight (NLOS) environments. The channel capacity of the proposed method is derived for the direct path environments and it confirms the effectiveness of the proposed scheme in the LOS scenario. Moreover, solid computer simulation results confirm the effectiveness of the proposed method in both, single user and multiuser scenarios.

Yasushi Takatori was born in Tokyo, Japan, 1971. He received his B.E. degree in electrical and communication engineering and his M.E. degree in system information engineering from Tohoku University, Sendai, Japan in 1993 and 1995, respectively. He received his Ph.D. degree in wireless communication engineering from Aalborg University, Denmark in 2005. In 1995, he joined the NTT Wireless Systems Laboratories, Nippon Telegraph and Telephone Corporation (NTT), in Japan. He is now working on NTT Network Innovation Laboratories. He was a visiting researcher at the Center for TeleInFrastructure (CTIF), Aalborg University, Aalborg, Denmark from 2004 to 2005. He received the Young Engineers Award from the IEICE of Japan in 2000, the Excellent Paper Award of WPMC in 2004 and YRP Award in 2005. His current research interest is smart antennas, MIMO systems and spatial signal processing techniques. He is an associate editor of Springer Journal of Wireless Personal Communications. He is a member of the IEEE and the IEICE.
Frank H. P. Fitzek was born in Berlin, Germany in 1971. He is an Associate Professor in the Department of Communication Technology, University of Aalborg, Denmark heading the Future Vision group. He received his diploma (Dipl.-Ing.) degree in electrical engineering from the University of Technology – Rheinisch-Westf älische Technische Hochschule (RWTH) – Aachen, Germany, in 1997 and his Ph.D. (Dr.-Ing.) in Electrical Engineering from the Technical University Berlin, Germany in 2002. As a visiting student at the Arizona State University he conducted research in the field of video services over wireless networks. He co-founded the start-up company acticom GmbH in Berlin in 1999. In 2002 he was Adjunct Professor at the University of Ferrara, Italy giving lectures on wireless communications and conducting research on multi-hop networks. His current research interests are in the areas of 4G wireless communication, QoS support for multimedia services, access techniques, security for wireless communication, and the integration of multi hop networks in cellular systems. Dr. Fitzek serves on the Editorial Board of the IEEE Communications Surveys & Tutorials. He is the program chair for the International Conference on Advances in Computer Entertainment Technology (ACE2004) and serves in the program committee for VTC2003, VTC2004, ACE2004, and IEEE MWN2004.
Koichi Tsunekawa was born in Niigata, Japan, on January 21, 1958. He received the B.S., M.S. and Ph.D. degrees in Science Engineering from Tsukuba University, Ibaraki, Japan, in 1981, 1983 and 1992 respectively. In 1983 he joined the NTT Electrical Communications Laboratories (ECL), Nippon Telegraph and Telephone Corporation, Tokyo, Japan. Since 1984, he has been engaged in the research and development of portable telephone antennas in land mobile communication systems. From 1993 to 2003, he was with NTT DoCoMo Incorporation. He worked on radio propagation research, intelligent antenna systems for wireless communications and developing IMT-2000 antenna systems. His research interests are antenna systems for MIMO transmission, millimeter wave broadband access and ubiquitous wireless system. He is an Executive Research Engineer in the Wireless Systems Innovation Laboratory, NTT Network Innovation Laboratories, NTT.
Ramjee Prasad currently Prof. Ramjee Prasad is Director of the Center for Teleinfrastruktur (CTIF). He has published over 500 technical papers, and authored and co-edited 15 books about Wireless Multimedia Communications (Artech House). His research interest lies in wireless networks, packet communications, multiple access protocols, access techniques and multimedia communications. He is a fellow of the IEE, a fellow of IETE, a senior member of IEEE, a member of NERG, and a member of the Danish Engineering Society (IDA).