Qianling Cao

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The use of multiple laser transmitters combined with multiple photodetectors (PDs) is studied for terrestrial, line-of-sight optical communication. The resulting multiple-input/multiple-output channel has the potential for combatting fading effects on turbulent optical channels. In this paper, the modulation format is repetition -ary PPM across lasers, with(More)
We study the use of multiple laser transmitters combined with multiple photodetectors for atmospheric, line-of-sight optical communication, and focus upon the use of multiple-pulseposition-modulation as a power-efficient transmission format, with signal repetition across the laser array. Ideal (photon counting) photodetectors are assumed, with and without(More)
Multiple transmitter and receivers can be used to combat link outage due to the atmosphere turbulence and scattering in an urban ‘last-mile’ free space optical communication system. We investigate the use of an optical preamplifier in the resulting multiple-input-multiple-output (MIMO) system for atmospheric line-of-sight optical communication, with signal(More)
The use of an optical pre-amplifler in a multiple laser multiple receive aperture system for atmospheric line-of- sight optical communications is investigated. Multiple transmit- receive paths serve to fight channel fading due to clear air scintillation. Using orthogonal polarization and repetition coding cross two lasers is shown to provide transmitter(More)
The global telecommunications network has seen massive expansion over the last few years. Optical communication through clear atmosphere provides a means for high data rate communication over relatively short distances (e.g. 2km). However, the turbulence in the atmosphere leads to fades of varying depths, some of which may lead to heavy loss of data. Free(More)
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