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ATTRIBUTES

Award Information

Agency:
National Aeronautics and Space Administration
Branch:
N/A
Award ID:
2849
Program Year/Program:
1985 / SBIR
Agency Tracking Number:
2849
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Stanford Telecommunications
6888 Elm Street Mclean, VA 22101
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 1
Fiscal Year: 1985
Title: ATTRIBUTES
Agency: NASA
Contract: N/A
Award Amount: $49,981.00
 

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.

Principal Investigator:

Robert g harkness
PRINCIPAL INVESTIGATOR

Business Contact:

Small Business Information at Submission:

Stanford Telecommunications
6888 Elm St Mclean, VA 22101

EIN/Tax ID:
DUNS: N/A
Number of Employees: N/A
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No