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We investigate modulation and coding techniques that approach the fundamental limits of communication and key distribution over optical channels, in the regime of simultaneously high photon and bandwidth efficiencies. First, we develop a simple and robust system design for free-space optical communication that incorporates pulse-position modulation (PPM) over multiple spatial degrees of freedom in...
The channel for a Comm-on-the-move (COTM) terminal in a blockage environment communicating over a satellite can be characterized as a packet erasure channel with long channel memory and long feedback delay. The goal of our research is to enable real-time application, such as a two-way voice call, over such a challenging channel. These packets need to be delivered reliably with strict order requirement...
Two challenges facing adaptive decision feedback equalizers (DFEs) in the underwater acoustic channel are those of the channel changing too rapidly to allow for the stable adaptation of the number of coefficients required to represent the equalizer filters and the high computational complexity of the associated adaptation algorithms. These challenges are particularly acute for multichannel DFEs where...
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