Open AccessLDPC-coded MIMO optical communication over the atmospheric turbulence channel using Q-ary pulse-position modulation
Author(s) -
Ivan B. Djordjević
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.010026
Subject(s) - low density parity check code , pulse position modulation , mimo , bit error rate , channel (broadcasting) , computer science , pairwise error probability , channel capacity , modulation (music) , electronic engineering , optics , free space optical communication , transmission (telecommunications) , telecommunications , optical communication , physics , algorithm , decoding methods , pulse amplitude modulation , pulse (music) , engineering , acoustics , detector
We describe a coded power-efficient transmission scheme based on repetition MIMO principle suitable for communication over the atmospheric turbulence channel, and determine its channel capacity. The proposed scheme employs the Q-ary pulse-position modulation. We further study how to approach the channel capacity limits using low-density parity-check (LDPC) codes. Component LDPC codes are designed using the concept of pairwise-balanced designs. Contrary to the several recent publications, bit-error rates and channel capacities are reported assuming non-ideal photodetection. The atmospheric turbulence channel is modeled using the Gamma-Gamma distribution function due to Al-Habash et al. Excellent bit-error rate performance improvement, over uncoded case, is found.