Coded PPM and Multipulse PPM and Iterative Detection for Free-Space Optical Links

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Signal modulation has an important impact on the system performance in optical communication. Two attractive modulation schemes are Pulse Position Modulation (PPM) and Multi Pulse PPM (MPPM), which have the advantage of average energy efficiency and bandwidth efficiency, respectively. An important practical issue is to employ an efficient channel coding of reasonable (decoding) complexity adapted to these modulations. In this paper, authors consider the use of a classic binary convolutional code together with iterative soft demodulation and channel decoding at the receiver.