对数正态分布衰落下的光OFDM 水下可见光通信空间分集系统
Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
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Yn: Infrared and Laser Engineering, Cyfrol 49, Rhif 2, 25.02.2020.
Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
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T1 - 对数正态分布衰落下的光OFDM 水下可见光通信空间分集系统
AU - Jiang, Hongyan
AU - Qiu, Hongbing
AU - Ning, He
AU - Yue, Wu
AU - Ahmad, Zahir
AU - Rajbhandari, Sujan
PY - 2020/2/25
Y1 - 2020/2/25
N2 - Underwater visible light communication (UVLC) is an attractive solution to achieve high - speed and large -data transmission but challenging due to the impairments induced by absorption, scattering and turbulence. To combat effects of multipath and fading for the UVLC system over turbulence channels, optical orthogonal frequency division multiplexing (O -OFDM) schemes with the transceiver spatial diversity were proposed, which employed equal gain combining (EGC) at the receiver side. Underwater path loss was calculated by a generalized Lambertian formula, and the fading induced by weak turbulence was modelled as a lognormal -distribution random variable. Based on the channel model and Monte Carlo (MC) simulation, the bit error ratio (BER) performance for quadrature - amplitude modulation (QAM) asymmetrically clipped optical OFDM (ACO -OFDM) and DC -biased optical OFDM (DCO -OFDM) systems in the channel with and without turbulence was evaluated. Furthermore, the diversity gain was estimated for different diversity orders and scintillation indexes. The results demonstrate that the diversity scheme with EGC is an effective measure to reduce the effect of turbulence and could be useful for designing, predicting, and evaluating the performance of O -OFDM UVLC system in a weak oceanic turbulence condition.
AB - Underwater visible light communication (UVLC) is an attractive solution to achieve high - speed and large -data transmission but challenging due to the impairments induced by absorption, scattering and turbulence. To combat effects of multipath and fading for the UVLC system over turbulence channels, optical orthogonal frequency division multiplexing (O -OFDM) schemes with the transceiver spatial diversity were proposed, which employed equal gain combining (EGC) at the receiver side. Underwater path loss was calculated by a generalized Lambertian formula, and the fading induced by weak turbulence was modelled as a lognormal -distribution random variable. Based on the channel model and Monte Carlo (MC) simulation, the bit error ratio (BER) performance for quadrature - amplitude modulation (QAM) asymmetrically clipped optical OFDM (ACO -OFDM) and DC -biased optical OFDM (DCO -OFDM) systems in the channel with and without turbulence was evaluated. Furthermore, the diversity gain was estimated for different diversity orders and scintillation indexes. The results demonstrate that the diversity scheme with EGC is an effective measure to reduce the effect of turbulence and could be useful for designing, predicting, and evaluating the performance of O -OFDM UVLC system in a weak oceanic turbulence condition.
KW - Fading
KW - Lognormal distribution
KW - OFDM
KW - Spatial diversity
KW - UVLC
U2 - 10.3788/IRLA202049.0203008
DO - 10.3788/IRLA202049.0203008
M3 - Erthygl
VL - 49
JO - Infrared and Laser Engineering
JF - Infrared and Laser Engineering
IS - 2
ER -