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Integrated Performance of Next Generation High Data Rate Receiver and AR4JA LDPC Codec for Space CommunicationsLow-density parity-check (LDPC) codes are the state-of-the-art in forward error correction (FEC) technology that exhibits capacity approaching performance. The Jet Propulsion Laboratory (JPL) has designed a family of LDPC codes that are similar in structure and therefore, leads to a single decoder implementation. The Accumulate-Repeat-by-4-Jagged- Accumulate (AR4JA) code design offers a family of codes with rates 1/2, 2/3, 4/5 and lengths 1024, 4096, 16384 information bits. Performance is less than one dB from capacity for all combinations.Integrating a stand-alone LDPC decoder with a commercial-off-the-shelf (COTS) receiver faces additional challenges than building a single receiver-decoder unit from scratch. In this work, we outline the issues and show that these additional challenges can be over-come by simple solutions. To demonstrate that an LDPC decoder can be made to work seamlessly with a COTS receiver, we interface an AR4JA LDPC decoder developed on a field-programmable gate array (FPGA) with a modern high data rate receiver and mea- sure the combined receiver-decoder performance. Through optimizations that include an improved frame synchronizer and different soft-symbol scaling algorithms, we show that a combined implementation loss of less than one dB is possible and therefore, most of the coding gain evidence in theory can also be obtained in practice. Our techniques can benefit any modem that utilizes an advanced FEC code.
Document ID
20150014756
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Cheng, Michael K.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Lyubarev, Mark
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Nakashima, Michael A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Andrews, Kenneth S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Lee, Dennis
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 3, 2015
Publication Date
May 12, 2008
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Meeting Information
Meeting: SpaceOps 2008
Location: Heidelberg
Country: Germany
Start Date: May 12, 2008
End Date: May 16, 2008
Sponsors: American Inst. of Aeronautics and Astronautics
Distribution Limits
Public
Copyright
Other

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