Iterative Coded Pulse-Position-Modulation for Deep-Space Optical Communications

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. T...

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Bibliographic Details
Main Authors: Barsoum, M.F., Moision, B., Fitz, M.
Format: Conference Proceeding
Language:English
Subjects:
Bit error rate
Convolutional codes
Earth
Information analysis
Mars
Modulation coding
Optical fiber communication
Optical pulses
Parity check codes
Pulse modulation
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Summary: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.
DOI:10.1109/ITW.2007.4313051