The wireless network introduced here, called “CelluLAN,” can be used as both wireless local area network (LAN) and as a microcellular network. This is achieved by providing the capability of efficient spectral reuse. This capability became possible by spread-spectrum methods that allow the rejection of interference from adjacent CelluLANs. Spread-spectrum also enhances the multiple access throughput by utilizing its delay capture properties. In particular, we have presented the spread-spectrum random access (SSRA) and the spread-spectrum digital sense multiple access (SS-DSMA), which are based on the media access control (MAC) layer protocols of slotted Aloha and DSMA, respectively. These protocols are then enhanced with the capability of “joint delay and power capture” which is provided at the physical layer. Performance analysis of the system has been carried out to provide the throughput and the uncoded bit error rate of the SSRA and SS-DSMA protocols. The performance analysis is based on a detailed evaluation of the interference power between adjacent CelluLANs or frequency bands in a fully loaded network and with different types of pulse shaping filter. Performance results indicate that the CelluLAN network has satisfactory throughput performance with SS-DSMA protocol and when frequency reuse is one. As shown, the throughput performance is improved significantly when we use the joint delay-power capture technique. We also show that when the spreading factor increases above the point at which the frequency bands overlap, the access throughput begins to decrease.
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Diakoumis Gerakoulis received his Ph.D. degree from the City University of New York in 1984, his M.S. degree from Polytechnic Institute of New York in 1978, and his B.S. degree from New York Institute of Technology in 1976; all in electrical engineering. From 1984 to 1987 he was assistant professor in the Electrical Engineering Department at Pratt Institute, Brooklyn, New York, and from 1987 to 1989 an associate professor at the Center of Excellence in Information Systems at Tennessee State University. In 1989 he joined AT & T Bell Laboratories as a member of technical staff, where he worked on common channel signaling and radio access technologies for personal communications. In 1996 he joined AT & T laboratories where he was involved in the system design, analysis and performance of common air interfaces for PCS. In 1998 he joined AT & T Labs-Research as a principal member of technical staff where he was involved in wideband access technologies for wireless and digital subscriber lines. In 2004 he joined General Dynamics – Advanced Information Systems where he is currently a senior lead engineer in systems where he is involved in ad hoc and sensor networks.
Dr. Gerakoulis holds eight USA patents and he is co-author of the book CDMA: Access and Switching John Wiley, Feb 2001. Dr. Gerakoulis has also published many papers in journals and conference proceedings in the areas of satellite switching and multiple access, spread-spectrum access and synchronization and multi-carrier CDMA for wireless communications.
Evaggelos Geraniotis (SM’ 88) received the Diploma (with highest honors) in Electrical Engineering from the National Technical University of Athens, Athens, Greece, and the M.S. and Ph.D. degrees in EE from the University of Illinois at Urbana-Champaign.
From September 1985 to December 2001 he was with the University of Maryland, College Park, where from 1992 to 2001 he was Professor of Electrical Engineering and a member of the Institute for Systems Research and the Center for Satellite and Hybrid Communication Networks. Since January 2002, Dr. Geraniotis has been president of EG Wireless Systems Inc., a consulting company dedicated to research and development in commercial and military wireless communications.
Dr. Geraniotis’s research has been in communication theory, information theory and their applications with emphasis on wireless communications. His recent work focuses on data modulation, error control coding, multi-user detection and interference cancellation, array processing for receive and transmit diversity, retransmission techniques and multi-access protocols for wireless spread-spectrum and anti-jam communications. The algorithms are applied to cellular, mobile, PCS, fixed wireless, satellite but also to optical, copper-loop and cable networks. He has also worked on multi-media and mixed-media integration and switching for radio and optical neworks as well as on interception, feature-detection, and classification of signals, radar detection and multi-sensor data fusion.
He is co-author of the book CDMA: Access and Switching for Terrestrial and Satellite Networks, Joh Wiley, New York, Feb 2001 and and over 300 technical papers in journals and conference proceedings. He serves regularly as a consultant in the above areas for governmental and industrial clients. Dr. Geraniotis has served as Editor for Spread-Spectrum of the IEEE Transactions on Communications from 1989 to 1992.
Hany ElGamal was born in Egypt. He obtained his BS in Electrical Engineering from the University of Kairo, Egypt. From September 1999 to December 2002 he was a graduate assistant at the Dept of Electrical Engineering and the Institute of Systems Research of the University of Maryland, College Park, MD. His research interests are in information theory and communication theosry with applications to spread-spectrum systems, interference cancellation, coding and trasmit diversity.
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Gerakoulis, D., Geraniotis, E. & Elgamal, H. CelluLAN: A Microcellular Network of Spread-Spectrum Wireless LANs with Efficient Spectral Reuse. Wireless Pers Commun 33, 131–152 (2005). https://doi.org/10.1007/s11277-005-3923-1
- wireless LAN
- spectral reuse