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TRELLIS CODING WITH CONTINUOUS PHASE MODULATION (CPM) FOR SATELLITE BASED LAND MOBILE COMMUNICATION

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: 2855
Amount: $286,000.00
Phase: Phase II
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Timeline
Solicitation Year: N/A
Award Year: 1987
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
3231 Ocean Park Blvd #110
Santa Monica, CA 90405
United States
DUNS: N/A
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 F Abrishmakar
 Principal Investigator
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract

SATELLITE-BASED LAND MOBILE COMMUNICATION USING DIGITAL TECHNIQUES SUFFERS FROM POWER AND BANDWIDTH LIMITATIONS. THEREFORE THE NEED IS GROWING FOR THE DEVELOPMENT OF A BETTER POWER AND BANDWIDTH EFFICIENT CODING/MODULATION SCHEMES. THE PURPOSE OF THIS WORK IS TO DEVELOP AN OPTIMAL TRELLIS CODE COMBINED WITH POWER AND BANDWITH EFFICIENT MULTILEVEL CONTINUOUS PHASE MODULATION (CPM). THE COMBINED CODING/MODULATION SCHEME IS DESIGNED TO HAVE A RELATIVELY SMALL OUT OF BAND POWER IN ORDER TO MINIMIZE THE ADJACENT CHANNEL INTERFERENCE, ALLOWING TRANSMISSION OF 4800 BITS/SECOND THROUGH A 5 KHZ CHANNEL. THE SYSTEM WILL ALSO HAVE THE CAPABILITY OF HANDLING RICIAN FADING CHANNEL. FURTHERMORE, THE CPM IS A CONSTANT ENVELOPE MODULATION TECHNIQUE ALLOWING IT TO BE APPLICABLE FOR EFFICIENT HIGH POWER AMPLIFIER (HPA) IN TRANSMITTERS. IN PARTICULAR THIS WORK PLACES MORE EMPHASIS ON SHORT MEMORY ( 4) TRELLIS CODES WITH 8 LEVEL CPM AND SMALL MODULATION INDEX (H < .2). RECTANGULAR AND RAIDED COSINE PULSE SHAPES WITH DURATION ONEAND TWO SYMBOL TIMES WILL ALSO BE CONSIDERED.

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

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