Study of effects of obstacle on non-line-of-sight ultraviolet communication links

Abstract

This paper studies the effects of the obstacle on non-line-of-sight ultraviolet communication links using multiple-scatter model based on a Monte Carlo method. On the condition that transmitter beam and receiver FOV just pass the top of the obstacle, and ranges is fixed, the received energy density is at its maximum. The path loss increases when the transmitter or the receiver is much near to the obstacle, because the nearby common scattering volumes decrease intensively. The optimal received range decreases with the increasing of the distance between transmitter and obstacle. The predictions are validated with experimental measurements. This work can be used for the guidance of UV system design and network technology to apply in complex surroundings, such as mountain, buildings, etc.

Characteristics of non-line-of-sight polarization ultraviolet communication channels

“…The high absolute value of the degree results in lower interference power to the collocated receiver, and thus is better suited for NLOS polarization UV communications. In addition, the small divergence is favorable to improve received energy [14,19].…”

Outage analysis of MIMO NLOS‐UV communication systems over atmospheric turbulence channels

“…Compared with conventional IR transmission, non‐LOS (NLOS) links in the UV spectral regions are possible by atmospheric scattering, which relaxes or eliminates pointing, acquisition, and track requirements between the transmitter and the receiver. Also, solar‐blind features of the UV spectral band encourage a wider field‐of‐view (FOV) receiver [5, 6].…”

71-Mbit/s ultraviolet-B LED communication link based on 8-QAM-OFDM modulation

“…Subsequently, several theoretical models were developed to analyze the UV communication channel characteristics, such as temporal characterization, angular spectra and path loss [5,6]. The effect of large obstacle for NLOS channel characterization was evaluated in [7] by utilizing a low-pressure mercury lamp and a PMT combined with a solar-blind filter. Researches were also conducted on pulse broadening effects in NLOS communication channels [8], effect of turbulence and system geometry on the received signal energy distribution [9], and path loss and pulse broadening effects by onoff keying modulation [10].…”