Efficiency of coherent reception of optical signal propagating through turbulent atmosphere
Abstract
A multichannel heterodyne receiver with a compound telescope is considered for coherent reception of optical signals propagating through a turbulent atmosphere, each of its N identical channels consisting of an entrance lens with a filter before the heterodyne and a photodetector followed by an intermediate-frequency filter and an envelope detector behind it. The efficiency of such a receiver is calculated on the basis of two alternative models, with a random phase only in the first model and with not only a random phase but also a random amplitude subject to Rayleigh fluctuation in the second model. Calculations on the basis of the first model yield a lower missed-hit probability at a fixed false-alarm probability, except in the range of few photodetector readings where it is equal to or higher than according to the second model. A comparison with a single-channel receiver indicates a much higher detection efficiency of a multichannel one in terms of missed-hit probability, the optimum number of channels being selected on the basis of maximum signal-to-noise ratio.
- Publication:
-
USSR Rept Electron Elec Eng JPRS UEE
- Pub Date:
- September 1985
- Bibcode:
- 1985RpEEE.......93B
- Keywords:
-
- Amplitudes;
- Atmospheric Turbulence;
- Optical Communication;
- Superheterodyne Receivers;
- Probability Theory;
- Signal Processing;
- Signal Reception;
- Signal To Noise Ratios;
- Communications and Radar