The problem of diversity transmission and reception to mitigate the impact of turbulence is studied for Poisson photon channels. Specifically, it is assumed that the wavelength diversity is considered in order to avoid the spatial constraints imposed on the space-borne receivers when spatial diversity is considered. The proposed system uses a single aperture to transmit and receive optical signals. It is assumed that the pulseposition modulation (PPM) is used to generate the transmitted optical radiation. Furthermore, it is assumed that a shot-noise limited operation is encountered and the receiver is a photon counting detector. Performance is established in terms of the scintillation index of the multi-wavelength PPM system and the overall bit error rate of the proposed system. It is assumed that the turbulence in the channel obeys either a lognormal distribution, for weak turbulence, or an exponential distribution, for long path integrated scenario or when the scintillation index is shown to be 1. It is shown here that the scintillation index is inversely proportional to the number of wavelength used. Performance is established in terms of the bit error rate. It is shown here that the performance can be substantially improved with the use of as few as 6 wavelengths in a multi-wavelength PPM system.
Wavelength diversity for PPM photon channels subject to atmospheric turbulence
01.11.2017
171385 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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