ATTRIBUTES

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$49,981.00
Award Year:
1985
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
2849
Agency Tracking Number:
2849
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
6888 Elm St, Mclean, VA, 22101
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
ROBERT G HARKNESS
PRINCIPAL INVESTIGATOR
() -
Business Contact:
() -
Research Institution:
n/a
Abstract
HIGH SPEED, HIGH FIDELITY DIGITAL COMMUNICATION LINKS HAVE ADIRE NEED FOR SIGNAL PROCESSING TECHNIQUES THAT CAN REDUCE TRANSMITTER POWER REQUIREMENTS. ONE POTENTIAL TECHNIQUE IS CONVOLUTIONAL CODING COUPLED WITH VITERBI ALGORITHM (VA) DECODING. STATE-OF-THE-ART VA DECODERS CAN PROVIDE 5.0 DB OF CODING GAIN, BUT HAVE A MAXIMUM OPERATING CAPABILITY OF 10 MBPS. IN ADDITION, THESE DECODERS ARE DESIGNED AND OPTIMIZED FOR THERMAL NOISE ENVIRONMENTS AND OFTEN PERFORM SUBSTANTIALLY SUB-OPTIMALLY WHEN RADIO NOISE ENVIRONMENTS AND OFTEN PERFORM SUBSTANTIALLY SUB-OPTIMALLY WHEN RADIO FREQUENCY INTERFERENCE IS PRESENT. THE GOAL OF THE PROPOSED RESEARCH IS TO DEVELOP A CONCEPTUALDESIGN OF A RATE R=1/2, CONSTRAINT LENGTH K=7 VA DECODER CAPABLE OF OPERATING AT 100 MBPS OR MORE. A PARALLEL OBJECTIVE IS TO INSURE ROBUST PERFORMANCE UNDER A VARIETY OFNON-IDEAL CONDITIONS BY USING AN UPDATED AND REALISTIC CHANNEL MODEL. THE DESIGN APPROACH IS TERMED "MASSIVE PARALLELISM" AND EMPLOYS A BANK OF VA DECODERS OPERATING IN A BLOCK DECODING MODE, COUPLED WITH A SMART BUFFERING SCHEME. ROBUSTNESS IS ACHIEVED THROUGH A NON-LINEAR QUANTIZER AND BY OPTIMIZING THE DECODER IMPLEMENTATION CHARACTERISTICS OVER A BROAD RANGE OF PRACTICAL CONDITIONS. INCLUDED IN THE EFFORT IS A PERFORMANCE ASSESSMENT VIA SIMULATION AND ANALYSIS, AND A PRELIMINARY TECHNOLOGY ASSESSMENT, FEASIBILITY STUDY, AND APPLICATIONS SURVEY.

* information listed above is at the time of submission.

Agency Micro-sites


SBA logo

Department of Agriculture logo

Department of Commerce logo

Department of Defense logo

Department of Education logo

Department of Energy logo

Department of Health and Human Services logo

Department of Homeland Security logo

Department of Transportation logo

Enviromental Protection Agency logo

National Aeronautics and Space Administration logo

National Science Foundation logo
US Flag An Official Website of the United States Government