EXIT Function Aided Design of Iteratively Decodable Codes for the Poisson PPM Channel

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
Published in:IEEE transactions on communications 2010-12, Vol.58 (12), p.3573-3582
Main Authors: Barsoum, M F, Moision, B, Fitz, M P, Divsalar, D, Hamkins, J
Format: Article
Language:English
Subjects:
Applied sciences
Channels
Charts
Coding, codes
Convolutional codes
Decoding
Design engineering
Earth
Error control coding
Exact sciences and technology
Information, signal and communications theory
Iterative decoding
Mars
Modulation
Modulation, demodulation
Mutual information
Noise levels
Noise measurement
optical communication
optical modulation
pulse position modulation
Satellite telecommunications. Space telecommunications
Serials
Signal and communications theory
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
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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.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2010.110310.060572