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Flexible high speed codecThe project's objective is to develop an advanced high speed coding technology that provides substantial coding gains with limited bandwidth expansion for several common modulation types. The resulting technique is applicable to several continuous and burst communication environments. Decoding provides a significant gain with hard decisions alone and can utilize soft decision information when available from the demodulator to increase the coding gain. The hard decision codec will be implemented using a single application specific integrated circuit (ASIC) chip. It will be capable of coding and decoding as well as some formatting and synchronization functions at data rates up to 300 megabits per second (Mb/s). Code rate is a function of the block length and can vary from 7/8 to 15/16. Length of coded bursts can be any multiple of 32 that is greater than or equal to 256 bits. Coding may be switched in or out on a burst by burst basis with no change in the throughput delay. Reliability information in the form of 3-bit (8-level) soft decisions, can be exploited using applique circuitry around the hard decision codec. This applique circuitry will be discrete logic in the present contract. However, ease of transition to LSI is one of the design guidelines. Discussed here is the selected coding technique. Its application to some communication systems is described. Performance with 4, 8, and 16-ary Phase Shift Keying (PSK) modulation is also presented.
Document ID
19920012770
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Boyd, R. W. (Harris Corp. Melbourne, FL, United States)
Hartman, W. F. (Harris Corp. Melbourne, FL, United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1992
Publication Information
Publication: NASA. Lewis Research Center, Advanced Modulation and Coding Technology Conference
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Accession Number
92N22013
Funding Number(s)
CONTRACT_GRANT: NAS3-25087
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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