## 1 Introduction  
UV wireless optical communication is a technology that utilizes UV light sources for data transmission and communication in the atmosphere [1]. This method is based on the unique properties of UV light to transmit information through the atmosphere and is typically used for short-range, high-speed communication, serving as an important supplement to conventional communication methods. UV light communication has received widespread attention due to its advantages in non-line-of-sight communication, strong interference resistance, and low environmental noise. Solar UV radiation in the UV spectrum is heavily absorbed by ozone molecules as it traverses the atmosphere, resulting in nearly zero UV radiation intensity reaching the Earth's surface. This creates conditions of extremely low environmental light noise conducive to UV light communication [2]. Compared to visible light, UV light has a shorter wavelength and stronger scattering ability, providing advantages for non-line-of-sight scatter communication [3; 4; 5]. Additionally, UV light communication offers benefits in interference resistance and confidentiality [6],enabling it to provide stable and efficient communication capabilities in complex and specialized communication environments [7]. The development of UV wireless communication systems involves advancements in scattering channel models to describe UV signal propagation characteristics in various environments. These models are critical for optimizing UV communication system performance, particularly in non-line-of-sight (NLOS) scenarios where direct signal transmission is hindered. Most UV scattering channel models use stochastic geometric frameworks and Monte Carlo methods to simulate and calculate link gains [8; 9; 10]. UV NLOS scattering communication primarily estimates path loss in NLOS channels using single-scattering models [8]. Initially proposed for detailed analysis of UV scattering channel properties, single-scattering models have been subject to recent experimental studies on short-range NLOS scattering channels [11; 12]. Single-scattering and Monte Carlo-based multi-scattering models have been developed by researchers to study the effects of atmospheric turbulence, investigating parameters such as pulse effects, path loss, and bandwidth, while also conducting simulation studies on the impact of transmitter and receiver elevation angles on system error rates [8]. Additionally, a non-Monte Carlo-based NLOS UV communication system channel model has been proposed, focusing solely on single-scattering and double-scattering events. This model, compared to Monte Carlo-based approaches, demonstrates superior communication performance [13]. The use of UV LEDs for UV NLOS scattering communication in ultraviolet communication systems has been widely studied [14; 15; 16]. Published experiments have shown that data transmission rates of up to 2 kbps can be achieved at distances of 100 m [17]. A multiple input multiple output (MIMO) UV communication system has been successfully designed, enabling stable communication distances of 30 m with a data transmission rate of 250 kbps while maintaining an acceptable error rate [18]. Additionally, an outdoor NLOS UV communication platform has been established, enabling outdoor communication distances of up to 500 m with a data rate of 400 kbps and a frame error rate of \(10^{-5}\)[19]. However, the tailing effect of UV LED emissions can degrade the quality of UV communication, leading to an increase in BER. In this context, our study focuses on investigating the impact of LED tailing on system BER and evaluates the performance of UV communication systems when adjusting the signal duty cycle to mitigate the effects of tailing. We employ 265 nm LEDs to transmit UV signals using OOK modulation. A photomultiplier tube (PMT) serves as the system receiver, with PMT output data sampled and processed through operational amplifier circuits and ADC chips before being transmitted to a data processing module composed of FPGA chips and peripheral circuits.