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Integrated performance of next generation high data rate receiver and AR4JA LDPC codec for space communications

Show simple item record Cheng, Michael K. Lyubarev, Mark Nakashima, Michael A. Andrews, Kenneth S. Lee, Dennis 2015-07-14T17:58:18Z 2015-07-14T17:58:18Z 2008-05-12
dc.identifier.citation SpaceOps 2008, Heidelberg, Germany, May 12-16, 2008 en_US
dc.identifier.clearanceno 08-1056
dc.description.abstract Low-density parity-check (LDPC) codes are the state-of-the-art in forward error correc- tion (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) re- ceiver 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. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2008 en_US
dc.title Integrated performance of next generation high data rate receiver and AR4JA LDPC codec for space communications en_US
dc.type Preprint en_US

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