EXIT function aided design of iteratively decodable codes for the poisson PPM channel

  • Authors:
  • Maged F. Barsoum;Bruce Moision;Michael P. Fitz;Dariush Divsalar;Jon Hamkins

  • Affiliations:
  • Broadcom Corporation, San Jose, CA;Information Processing Group, Jet Propulsion Laboratory, Pasadena, CA;University of California, Los Angeles, CA and Northrop Grumman Space Technology, Redondo Beach, CA;Information Processing Group, Jet Propulsion Laboratory, Pasadena, CA;Information Processing Group, Jet Propulsion Laboratory, Pasadena, CA

  • Venue:
  • IEEE Transactions on Communications
  • Year:
  • 2010

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Abstract

This paper presents and compares two iterative coded modulation techniques for deep-space optical communications using pulse-position modulation (PPM). The first code, denoted by SCPPM, consists of the serial concatenation of an outer convolutional code, an interleaver, a bit accumulator, and PPM. The second code, denoted by LDPC-PPM, consists of the serial concatenation of an LDPC code and PPM. We employ Extrinsic Information Transfer (EXIT) charts for their analysis and design. Under conditions typical of a communications link from Mars to Earth, SCPPM is 1 dB away from capacity, while LDPC-PPM is 1.4 dB away from capacity, at a Bit Error Rate (BER) of approximately 10-5. However, LDPC-PPM lends itself naturally to low latency parallel processing in contrast to SCPPM.