Low complexity error-control-coding for variable duty-cycle pulse-position-modulation

Bruce Moision

doi:10.1117/12.798441

19 August 2008 Low complexity error-control-coding for variable duty-cycle pulse-position-modulation

Bruce Moision

Proceedings Volume 7091, Free-Space Laser Communications VIII; 709104 (2008) https://doi.org/10.1117/12.798441
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.798441

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