High Efficiency Waveform for Small-Aperture, Mobile, Satellite Communication Networks

Award Information
Agency: Department of Defense
Branch: Army
Contract: W15P7T-04-C-J407
Agency Tracking Number: A032-3300
Amount: $69,914.00
Phase: Phase I
Program: SBIR
Awards Year: 2004
Solicitation Year: 2003
Solicitation Topic Code: A03-115
Solicitation Number: 2003.2
Small Business Information
5250 South Virginia Street, Suite 340, Reno, NV, 89502
DUNS: 140446290
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Joseph Tavormina
 (775) 825-1922
Business Contact
 Joseph Tavormina
Title: President
Phone: (775) 825-1922
Email: jtavormina@etherware.com
Research Institution
The proposed research is to develop an overall system design for a power- and bandwidth efficient satellite communication modem, a communication waveform and an associated Medium Access Control (MAC) protocol to realize efficiency improvements. In currently deployed networks a single modulation scheme is typically used to communicate with all the users in the network, thus requiring a communication waveform designed to serve the most disadvantaged user. Given a typical mix of locations within a Ka-Band spot beam (e.g. at the center of the coverage area vs. the edge of the coverage area), local propagation conditions (e.g. local rain fade), and antenna sizes, current system designs typically result in allocation of 5-9 dB of excess link margin to the vast majority of users. Implementing the proposed waveform and modem that support dynamic, variable resource allocation can improve network capacity by a conservative factor of 3 to 5. Currently deployed networks typically base the return link on a Time Division Multiple Access (TDMA) waveform, which requires tight synchronization of terminals and a transmitter with high RF output power. The proposed implementation employs a spread spectrum return link that mitigates synchronization requirements and reduces the required RF output power, resulting in a more economical terminal design.

* Information listed above is at the time of submission. *

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