24 February 2017 Data delivery performance of space-to-ground optical communication systems employing rate-constrained feedback protocols
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Abstract
Space-based optical communication systems that transmit directly to Earth must provision for changing conditions such as received power fluctuations that can occur due to atmospheric turbulence. One way of ensuring error-free communication in this environment is to introduce link-layer feedback protocols that use an Earth-toSpace uplink to request retransmission of erroneous or missing frames. In this paper, we consider near-Earth systems that use low-bandwidth uplinks to supply feedback for automatic repeat request (ARQ) protocols. Constraining the uplink signaling bandwidth can reduce the complexity of the space terminal, but it also decreases the efficacy of feedback schemes. Using a Markov-based model of the link-layer channel, we give an analytical result for the downlink performance penalty of a system employing a data-rate-constrained selective-repeat ARQ protocol. We find that the tradeoff between downlink performance and feedback rate is primarily influenced by the coherence time of the atmospheric channel.
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C. M. Schieler, B. S. Robinson, D. M. Boroson, "Data delivery performance of space-to-ground optical communication systems employing rate-constrained feedback protocols", Proc. SPIE 10096, Free-Space Laser Communication and Atmospheric Propagation XXIX, 1009616 (24 February 2017); doi: 10.1117/12.2260669; https://doi.org/10.1117/12.2260669
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