The Aerospace and Electronic System/Engineering …



[pic]IEEE NJ Coast Section

The Combined Aerospace and Electronic Systems & Engineering Management Systems Chapters Present

"On A Method To Establish Satellite Links For Dynamic Bandwidth Allocation"

V. Weerackody, E. Cuevas and L. Gonzalez

The Johns Hopkins University

Applied Physics Laboratory

Current trends in military communications systems show an increased demand for bandwidth, the need for any-to-any communications, and the use of smaller and lighter terminal equipment. Satellite communication systems are paramount to the mobile network-centric battlefield architecture. The concept of operation recognizes the need to support mobility and users with satellite terminals of various antenna aperture sizes. In these applications, communications resources, such as transponder power, bandwidth and the terminal’s transmit power, have to be allocated among all terminals in an appropriate manner so as to satisfy several predetermined criteria.

In order to limit interference to adjacent satellites regulatory and standards bodies (FCC/ITU) have established strict limits on the effective isotropic radiated power (EIRP) that a terminal can transmit. Accordingly, terminals with smaller antenna apertures will have to transmit at smaller EIRP levels. A typical battlefield environment will employ terminals of vastly different aperture sizes: very small aperture terminals mounted on mobile platforms for communications on-the-move applications, small to medium size apertures for communications on-the-halt applications where the antenna platform is not mobile, and large aperture terminals for stationary hubs. Dynamic allocation of bandwidth and power across terminals employing different aperture sizes is a challenging task.

In this Talk we will examine the bandwidth and power allocation problem for a Multi-Frequency Time Division Multiple Access (MF-TDMA) based satellite communication system and present a method to optimize the use of bandwidth and power at the satellite transponder.

September 20, 2005; 11:30 AM at Gibbs Hall in Eatontown, NJ

Registration for this talk is Required. Please use the following link



Cost of $8 for Members, $11 Non-Members (Lunch Included with Registration)

Dru Reynolds, AES/EMS Chapter Chair : dru.reynolds@

Himanshu Pant, AES/EMS Chapter Treasurer & Vice-Chair: hpant@

Speakers Bios

Vijitha Weerackody - received his Ph.D. in electrical engineering from the University of Pennsylvania in 1989. His area of expertise is in signal processing and communication systems. Before joining the Johns Hopkins University Applied Physics Laboratory he worked at AT&T Bell Laboratories and Telcordia Technologies.

Dr. Enrique Cuevas is a Senior Member of the Technical Staff at the Applied Physics Lab at JHU. He has over 20 years of experience in the field of satellite communications systems. Prior to his current position, he held various technical leadership roles at AT&T Bell Laboratories, having worked in the areas of satellite network technology development, performance analysis, IP, MPLS, and VoIP architectures. More recently, he was a Chief Technologist at Northrop Grumman IT-TASC, where he worked in the areas of sensor networks and network modeling and simulation.

Dr. Cuevas has also a participated at the ATM Forum, the IETF, and held various leadership positions at the TIA-TR34, the US Working Party 4B, and at the ITU Radiocommunications Study Group 4.

Dr. Cuevas obtained his Masters and Ph.D. degrees in Electrical Engineering from the University of Texas at Austin

He is Senior Member of IEEE.

Lino Gonzalez - received his MS in Electrical Engineering from Monmouth University in 1997.  For the past 13 years he has provided direct system engineering support to the US Army Program Executive Office PM MILSTAR, PM MILSATCOM and PM WIN-T. His area of expertise is in Military satellite communication systems such as MILSTAR, UFO, GBS and GAPFILLER. He has served as the systems engineer on the Army SCOTT, SCAMP, KaSAT and Phoenix terminal programs.

Mr. Gonzalez is a Senior Member of the Technical Staff at the Johns Hopkins University Applied Physic Laboratory.        

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