19 August 2008 Low complexity error-control-coding for variable duty-cycle pulse-position-modulation
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Efficient use of a deep-space optical communications channel requires changes to the duty cycle of the modulation as the signal and noise powers change. This can be facilitated by modulating the signal with pulse-positionmodulation (PPM), supporting multiple PPM orders. To implement iterative demodulation, which is required by certain error-correction-codes to obtain near-capacity performance, would nominally require a distinct hardware implementation for each PPM order. In this paper we describe a method to utilize a single hardware implementation of an iterative demodulator for any PPM order. The method may be applied to any coded modulation that utilizes iterative demodulation and maps to multiple modulation orders.
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Bruce Moision, Bruce Moision, } "Low complexity error-control-coding for variable duty-cycle pulse-position-modulation", Proc. SPIE 7091, Free-Space Laser Communications VIII, 709104 (19 August 2008); doi: 10.1117/12.798441; https://doi.org/10.1117/12.798441

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