Open AccessOptical Improved Quadrature Spatial Modulation for Cooperative Underwater Wireless Communication under Weak Oceanic Turbulence Conditions
Author(s) -
Bhowal Anirban,
Kshetrimayum Rakhesh Singh
Publication year - 2020
Publication title -
iet optoelectronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.379
H-Index - 42
eISSN - 1751-8776
pISSN - 1751-8768
DOI - 10.1049/iet-opt.2020.0012
Subject(s) - optical wireless , bit error rate , electronic engineering , quadrature amplitude modulation , wireless , optical wireless communications , computer science , signal to noise ratio (imaging) , underwater acoustic communication , quadrature (astronomy) , modulation (music) , optical communication , underwater , telecommunications , physics , channel (broadcasting) , engineering , acoustics , geography , archaeology
Amplify‐and‐forward cooperative underwater optical wireless communication employing optical improved quadrature spatial modulation (OIQSM) is proposed in this study. It uses multiple signal constellations, thereby improving the system performance. It uses multiple lasers but it activates only a few of them depending on the message bits and can transmit double modulated symbols in a single symbol interval. The OIQSM system performance is compared in terms of bit error rate (BER) with other existing schemes in the literature. The analysis is conducted for weak oceanic turbulence conditions, which is generally prevalent in deep oceans. The cost and power consumption analysis of OIQSM is performed to highlight its benefits over other schemes. It is observed that OIQSM yields a signal‐to‐noise ratio gain of at least 5.5 dB over the conventional optical spatial modulation scheme for any BER value between 10 − 2and 10 − 4 .