Effect of Receiver’s Tilted Angle on the Capacity for Underwater Wireless Optical Communication

Abstract

This paper focuses on the effect of the receiver’s tilted angle on the capacity of a clear ocean water Underwater Wireless Optical Communication (UWOC) system. To achieve this goal, the relationship between the channel capacity and the receiver’s tilted angle is investigated. First, we propose a double-exponential fading model with pointing error which can more accurately depict the channel of clear ocean water UWOC instead of the traditional Beer’s law model. Based on this channel model, we present the close-form expression of the capacity bounds of the UWOC system. Then, an optimization problem is formulated to improve the capacity by tilting the receiving plane. Both theoretical analyses and simulation results verify that the capacity bounds of UWOC can be enhanced dramatically by tilting the receiver plane at an optimal angle. Thus, in practice, we can provide an effective design strategy for a UWOC system.

Performance Analysis and Design Considerations of the Shallow Underwater Optical Wireless Communication System with Solar Noises Utilizing a Photon Tracing-Based Simulation Platform

“…Besides, considering its simplicity and efficiency, it can be used to do rapid qualitative analysis to see the impact of changing one system parameter on the system performance. Although the value is not accurate, we can observe the trend [31]. Thus, our simulation platform also provides such a function for fast evaluation.…”

Effect of the APD Receiver’s Tilted Angle on Channel Capacity for Underwater Wireless Optical Communications

“…where β is the pointing error angle in Figure 1. Inserting ( 4) and ( 5) into (3), the doubleexponential channel loss model with pointing error can be written as [22]…”

“…and after some necessary manipulation and simplification, we achieve the final expression of (22). The proof of ( 23) is based on the data processing inequality for relative entropies [23], i.e.,…”

Bit Error Performance of APD and SPAD Receivers in Optical Wireless Communication

“…A receiver field-of-view (FoV) of 90 • was reported to be best for positioning [12]. Indeed, for practical applications of OWC and VLC, the incidence angle has large effects on the data transmission [13,14]. The importance of wide-FoV receivers for the deployment of OWC was also mentioned in [15].…”