TDoA-Based Decisions Gathering Scheme for Optical Wireless Sensor Networks

This paper introduces an innovative decision-gathering scheme for an Optical Wireless Sensor Network (OWSN) with the primary goal of minimizing the decision error rate (DER). The proposed scheme implies that each sensor node is equipped with a Corner Cube Reflector (CCR), which according to its local decision, reflects the optical beam back to the Fusion Center (FC) or circulates it to another node. Then, the FC employs the Time Difference of Arrival (TDoA) method to identify the local decisions of nodes and generate a global decision. A closed-form expression of the DER in terms of false-alarm and miss-detection rates is derived. Additionally, comparative assessments via Matlab simulation against state-of-the-art reporting schemes are conducted. The analytical and simulation results of this paper reveal a noteworthy enhancement in DER of the proposed scheme at high numbers of nodes and low levels of signal power, demonstrating a substantial superiority over their counterparts of reporting schemes.