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In this paper, experimental measurements of path loss and pulse broadening in long-distance non-line-of-sight (N-LOS) ultraviolet (UV) communications are reported and analyzed, with measurements at distances up to 4 km. The comparison of these results with a multiple-scattering channel model based on the Monte Carlo simulation of photon propagation provides strong evidence of the validity of this...
Visible light communications (VLC) have gained popularity as an alternative to RF. Understanding the underlying communications is key to the design of MAC protocols for arbitrating access across lights in multiple rooms. We consider the interference across two rooms from VLC emitters. The emitters use Binary Pulse Position Modulation (BPPM); the pulse width is varied to provide different dimming levels...
We compare an analog and a digital method for characterizing the long-distance non-line-of-sight ultraviolet scattering channel. Experimental results and theoretical-model predictions are presented that provide demonstration and validation.
When the satellite navigation signals' interference power exceeds the receiver interference tolerance, the interference must be suppressed to ensure that the receiver works normally. Through analyzing the principle of the overlap window-based frequency domain narrowband interference suppression algorithm, this paper proposes using the reverse windowing approach to reduce the satellite signal distortion,...
The basic configuration of the Wuhan MST (Mesosphere-Stratosphere-Troposphere) radar, which is currently designed and constructed by School of Electronic Information, Wuhan University, is preliminarily described in this paper. The Wuhan MST radar operates at VHF band preoccupied with the real-time characteristics of turbulence and wind field vector in the height range 1–100km with a high temporal...
As an alternative to radio-frequency (RF) communications, optical wireless communications (OWC) can support high data rates and low power operations while providing good jamming resistance. Our focus in this paper is on deep ultraviolet (UV) outdoor communications (UVOC) where solar blind and non-line-of-sight operations are attractive. Light beams from UV LED arrays serve as information carriers...
The solar blind ultraviolet (UV) spectrum provides unique opportunities for wireless communications and sensing. We present recent experimental and analytical results in non-line-of-sight UV channel characterization and modeling, including impulse response and path loss. Path loss predictions are validated with experimental measurements outdoors. The effects of multiple scattering are captured and...
The prediction of the echo waveform from a target submerged in the shallow water wave-guide is considered. Target echo is seriously affected by the interfaces of the wave-guide especially in shallow water. This is unfavorable to the active detecting. It is of great significance both for theory and military affairs to build an accurate model for predicting the target echo in shallow water. Based on...
It is a challenge that network coding achieve wide use in wireless mesh networks. Network coding must be compatible or friendly with TCP in practice. We propose a mechanism that naturally add network coding to current network systems. In our scheme, the destination feedback the degree of freedom of encoding block, and delays of packet delivery minimize reordering and timeouts. Using multipath routing,...
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