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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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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Moision, B.
Fitz, M.
description 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_str_mv 10.1109/ITW.2007.4313051
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source IEEE Electronic Library (IEL) Conference Proceedings
subjects Bit error rate
Convolutional codes
Earth
Information analysis
Mars
Modulation coding
Optical fiber communication
Optical pulses
Parity check codes
Pulse modulation
title Iterative Coded Pulse-Position-Modulation for Deep-Space Optical Communications
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