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Adaptive combining of coherently detected PPM signals in the presence of atmospheric turbulence

Adaptive combining of coherently detected PPM signals in the presence of atmospheric turbulence

Fernández, Michela Muñoz; Vilnrotter, Victor A.
URI: http://hdl.handle.net/2014/41060
Date: 2004-10-04
Keywords: coherent optical communications; pulse position modulation (PPM); focal plane array; receivers
Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004.
Citation: International Astronautical Congress, Vancouver, British Columbia, Canada, October 4-8. 2004.

Abstract:

Adaptive combining of experimentally obtained heterodyned pulse position modulated (PPM) signals with pulse-to-pulse coherence, in the presence of simulated spatial distortions resembling atmospheric turbulence, is demonstrated. The adaptively combined PPM signals are phased up via an LMS algorithm suitably optimized to operate with PPM in the presence of additive shot-noise. A convergence study of the algorithm is presented, and results with both computer simulated and experimentally obtained PPM signals are presented and analyzed.

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