Enhanced Data Rate Performance for VLF/LF

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00039-01-C-3209
Agency Tracking Number: N011-0150
Amount: $99,799.00
Phase: Phase I
Program: SBIR
Awards Year: 2002
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Technology Service Corp.
11400 West Olympic Blvd., Suite 300, Los Angeles, CA, 90064
DUNS: 053885604
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Henry Schmidt
 Comm Program Manager
 (301) 565-2970
 hschmidt@tscwo.com
Business Contact
 James Miller
Title: Chief Financial Officer
Phone: (301) 565-2970
Email: jmiller@tscwo.com
Research Institution
N/A
Abstract
"Fleet Submarine Broadcast System (FSBS) VLF/LF communications are severely bandwidth limited due to the high Q of the transmit antennas and the low frequency of the VLF/LF band. The existing communications modes were designed using Minimum Shift Key (MSK)waveform modulation built into analog modulation and demodulation equipment. Soon the very capable digital Submarine Low Frequency/Very Low Frequency VMEbus Receiver (SLVR) will be deployed throughout the submarine fleet, and the analog modulators will bereplaced by digital modulators. Advanced modulation techniques such as partial response continuous phase modulation (CPM) at higher baud rates can now be considered for implementation in FSBS communications equipment. In addition, Low Density Parity CheckCodes (LDPCC) that provide additional coverage performance through forward error correction (FEC) are already being used for FSBS communications and additional improvements in these codes have been identified. Finally, incremental improvements in currentRange Extension Mode (REM) message data compression are also feasible. TSC proposes to investigate designs that incorporate a combination of advanced modulation techniques, adaptive data compression, and larger block size and higher code rate LDPCC forthe band-limited VLF communication channel in order to increase the data rate of FSBS information transfer 2 to 5 times yet maintain good coverage range.This research will establish t

* information listed above is at the time of submission.

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