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

被引:12
作者
Barsoum, Maged F.
Moision, Bruce [1 ]
Fitz, Michael P. [2 ,3 ]
Divsalar, Dariush [1 ]
Hamkins, Jon [1 ]
机构
[1] CALTECH, Jet Prop Lab, Informat Proc Grp, Pasadena, CA USA
[2] Northrop Grumman Space Technol, Redondo Beach, CA 90278 USA
[3] Univ Calif Los Angeles, Los Angeles, CA 90095 USA
基金
美国国家航空航天局;
关键词
Error control coding; pulse position modulation; optical modulation; optical communication; REED-SOLOMON; CAPACITY; COMMUNICATION; CONVERGENCE;
D O I
10.1109/TCOMM.2010.110310.060572
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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.
引用
收藏
页码:3573 / 3582
页数:10
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