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Proceedings Paper

Hybrid ARQ receiver for packet communications over free-space optical channels
Author(s): Kamran Kiasaleh
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Paper Abstract

In this paper, we present receiver architectures for post-detection combining of multiple transmitted packets in direct-detection (DD) photon channels. It is assumed that the optical signal is intensity modulated (IM) and that the receiver operates under a shot-noise limit condition. Furthermore, it is assumed that the channel is free of atmospheric turbulence or turbulence is negligible enough so that it can be assumed away. An automatic-repeat-request (ARQ) mechanism is utilized with a time-out feature of M retransmissions. Maximum a posteriori (MAP) rule is considered here to arrive at optimal combining mechanism for the above scenarios. Performance is established in terms of average delay and probability of packet loss. Furthermore, the probability of successful transmission of a packet in q (<M) attempts is obtained. It is shown that the proposed technique offers a significant reduction in the number of attempts for successful transmission of a packet as compared with the conventional method.

Paper Details

Date Published: 1 September 2006
PDF: 12 pages
Proc. SPIE 6304, Free-Space Laser Communications VI, 630407 (1 September 2006); doi: 10.1117/12.681355
Show Author Affiliations
Kamran Kiasaleh, The Univ. of Texas at Dallas (United States)

Published in SPIE Proceedings Vol. 6304:
Free-Space Laser Communications VI
Arun K. Majumdar; Christopher C. Davis, Editor(s)

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