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Expressions for the BER of M-ary PPM & biphase DPSK modulations in thepresence of noise are derived using analytical, statistical methods. The PPMexpression is verified via Poisson statistics based simulation. BER expressionsare then applied to a representative set of receiving telescope & sky spectralradiance parameters in order to assess performance of PPM & DPSK relative toone another. Finally, efficiency & additional considerations are discussed.

BER Performance of Photon Counting PPM vs. DPSK for Satellite Communications