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Home Events Events Archive 2012 The Spectral Efficiency of CSMA Ad-Hoc Networks

The Spectral Efficiency of CSMA Ad-Hoc Networks

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  • Visitor Seminars
When Jan 21, 2012
from 11:00 AM to 12:00 PM
Where ENGR. IV Bldg. Maxwell Room 57-124
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Wireless ad hoc networks (WANETs) allow users to communicate, sharing the same wireless channel,
without the need of any infrastructure. The performance of wireless ad-hoc networks (WANET) is mainly limited by its self-interference. The talk will focus on the performance of WANETs applying slotted carrier sense multiple access (CSMA) mechanism  and possibly utilizing also directional antennas. The CSMA protocol is based on RTS/CTS messages, which allow each node to evaluate the amount of interference that it will cause to other active nodes, and provide a powerful tool for network coordination.

Our analysis gives simple expressions for the network area spectral efficiency (ASE). The presented ASE expressions allow an evaluation of the optimal system parameters, and give insight on the behavior of the ASE as a function of the various system parameters. In particular we show that the ASE of a CSMA WANET is well approximated by the ASE of an optimized ALOHA WANET, multiplied by the exponent of the network back-off probability. We also show that if the network has a maximal delay constraint then the ASE grows linearly with the allowed delay.


Itsik Bergel had received the B.Sc. degree in electrical engineering and the B.Sc. degree in physics from Ben Gurion University, Beer-Sheva, Israel, in 1993 and 1994, respectively, and the M.Sc. degree and electrical engineering from the University of Tel Aviv, Tel Aviv, Israel, in 2000 and 2005 respectively. In 2005 he did a postdoc research at the Dipartimento di Elettronica of Politecnico di Torino. He currently is a lecturer at the School of Engineering, Bar-Ilan University, Ramat-Gan, Israel. His research spans various aspects of communications theory, including ad-hoc networks, DSL systems, UWB communications and capacity evaluations of non-coherent channels.

For more information please contact Prof. Mihaela van der Schaar (

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