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Following the trends of index modulated (IM) techniques for opticalcommunications, in the last few years several new waveform proposals have beenmade, aiming at conveying a higher density of information by driving differentsignal properties. One of these proposals mixes multi-pulse pulse-positionmodulation (MPPM) and quadrature amplitude modulation (QAM) in a system calledQAM-MPPM. We present here a new way to demodulate its compound waveform, and,for the non-turbulent free space optical (FSO) channel, we provide accurateanalytical expressions for its error probabilities, both in the case of thetraditional and the new detector. Based on these analytical derivations, wealso provide simplified expressions for the estimation of the errorprobabilities. We show that the new detector offers a gain of some tenths of dBin signal-to-noise ratio with respect to the previously defined one without anincrease in complexity, and that our error probability estimations are moreaccurate than previously published results. To the best of our knowledge, thiswork is the first to provide simulation results validating the study of theerror probability performance of QAM-MPPM.

Performance Analysis of QAM-MPPM in Turbulence-Free FSO Channels: Accurate Derivations and Practical Approximations