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To foster the scientific, educational and professional advancement of our members in the fields of electronic communications and signal processing.

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Date: Dec 15, 2015

"Power Allocation for Shared and Frequency Hopped Satellite Transponder"

Speaker: Dr. Lan Nguyen of the LinQuest Corporation

6:00 PM Social
6:30 PM Dinner 

7:15 PM Presentation
Location:

The Doubletree Club Orange County Airport
7 Hutton Centre Drive
Santa Ana, CA, 92707



Abstract:

Traditional transponded satellite systems are radio relays. These transponders can provide worldwide coverage to many remote regions of the world. They have been in operation for many years to provide point-to-point and broadcast communications for many commercial and military users. These systems are typically designed not to withstand high-power uplink adversary interference attacks. Under such circumstances, connectivities are interrupted and committed data rates are not delivered. In other words, there are no anti-jam requirements for such systems. As part of protected/secured communication systems, frequency hopping is one of the key features to provide anti-jam protection for military satellite communications (MILSATCOM) systems. To this end, a new concept has emerged to use frequency hopping signals over the Wideband Global SATCOM (WGS) transponder.

Transponder gains and power allocations for users have been studied previously for non-hopping signals. However, the main focus of previous work is to search for the optimal subchannel gains which minimize the utilization of the transponder power. These techniques are not applicable for hopping signals. Therefore, previous results from link budget to power allocation for non-hopping transponders are required to be re-evaluated. In this study, we present an approach to allocate power for multiple hopping signals, received from multiple uplink antennas for a shared power transponder. First, the end-to-end carrier-to-noise density ratio (CNRo) for a signal that hops within the transponder bandwidth is derived. This expression includes power-sharing factor, noise power robbing effects due to transponder noise, and intermodulation (IM) products. Next, the signal power allocation is determined to support the users’ requested data rates. Finally, the transponder gain is determined so that its traveling wave tube amplifier (TWTA) can operate at the desired nominal operating point (NOP).

Biography:

Dr. Lan Nguyen is currently with the LinQuest Corporation. LinQuest has a 35-year heritage of providing end-to-end communications and networking solutions to government and commercial customers. Dr. Nguyen has been with the LinQuest Corporation over 11 years. He has over 30 years of experience in DoD and commercial programs. He is actively involved in Military Satellite Communication (MILSATCOM). He has published numerous conference and journal papers. His main interests are in communication theory, satellite communication, digital signal processing, modeling, simulation, and analysis.

Dr Nguyen is a Senior Member of the IEEE and a member of Eta Kappa Nu Honor Society. He has served as the session chair for numerous conferences including the MILCOM and IEEE Globecom conferences. He also has served on numerous Technical Program Committee (TPC) including the MILCOM, IEEE Globecom, IEEE ICC, and IEEE VTC.
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Last updated 27 Nov 2015.