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In this paper, the authors consider the problem of turbo encoding/decoding for Pulse Position Modulation (PPM) that constitutes a very popular modulation scheme for Free-Space Optical (FSO) communications and unipolar Ultra-WideBand (UWB) communications. At the transmitter side, a simple mapping strategy is applied where the systematic information bit and the parity bit determine the PPM slot in which the signal is to be transmitted. At the receiver side, a convenient demodulation scheme, which is based on the soft decisions generated in all PPM slots, is proposed.
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