Abstract
A photon-counting-based iterative parallel interference cancellation (PIC) scheme for
free-space opticalcommunications in the presence of multiple-access interference, shot noise,
background radiation, and turbulence fading is designed. An efficient chip-level iterative
equivalent noise estimation algorithm is also derived. Simulation results show that the proposed
scheme can achieve a single-user performance,bound with the fast convergence property. More
importantly, it can eliminate the bit-error rate floor of the conventional optical code-division
multiple-access system with the aid of a relatively short spreading code length.
© 2012 Chinese Optics Letters
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