Parameter Optimization for an Underwater Optical Wireless Vertical Link Subject to Link Misalignments

Ikenna Chinazaekpere Ijeh (1) , Mohammad Ali Khalighi (1) , Steve Hranilovic (2)

1 FRESNEL - Institut FRESNEL
2 McMaster University - Department of Computing and Software

We consider transmitter-receiver (Tx-Rx) parameter optimization for a vertical underwater wireless optical communication link under misalignment conditions. The Tx is assumed to use a light-emitting diode while the Rx uses a silicon photomultiplier that allows a high Rx sensitivity. We consider two typical application scenarios and investigate optimization of the Tx and the Rx parameters to optimize the link performance in terms of outage probability. We derive accurate analytical expressions for the distribution of the channel attenuation accounting for link misalignments, which allows for the evaluation of the link performance in terms of bit-error-rate and outage probability without resorting to costly Monte Carlo simulations. Through numerical results, we show and discuss the impact of parameter optimization on the link performance in different link configurations and for various misalignment conditions. In particular, the presented results show the significant performance improvement resulting from optimizing the Tx beam divergence and the Rx FoV in the presence of pointing errors.

Mots clés: Underwater wireless optical communications; Link misalignment; Parameter optimization; Silicon photomultiplier; Vertical underwater links

Domaines: Traitement du signal et de l'image [eess.SP]; Optique / photonique

Ikenna Chinazaekpere Ijeh, Mohammad Ali Khalighi, Steve Hranilovic. Parameter Optimization for an Underwater Optical Wireless Vertical Link Subject to Link Misalignments. IEEE Journal of Oceanic Engineering, 2021, 46 (4), pp.1424-1437. ⟨10.1109/JOE.2021.3069046⟩. ⟨hal-03452616⟩