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Title: Throughput optimisation of a satellite communication link for a robust packet service
Author: Wan, Ping-Sum
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1994
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This thesis is set to study the efficiency of various error control techniques to provide a robust service on a packet oriented satellite link. Various Automatic Repeat reQuest (ARQ) techniques are discussed and the implementation of these techniques to a data link layer protocol, the HDLC, is studied and comparisons of their throughput performance are made. A new method (the Rm technique) of monitoring the noise condition on a link is introduced which is capable of making estimations of the noise level on the link continuously by passively observing the probability of successful transmission of frames. The validity and limitations of such a technique are discussed. Two schemes which make use of the noise condition information provided by the Rm technique to optimise the throughout performance in time-varying noise environment are proposed in this thesis. The first proposed scheme will send different numbers of copies of the same frame in a retransmission cycle, to increase the probability of successful transmission according the current noise level and the size of the frame. The throughput performance of such adaptive multiple copies scheme with various ARQ techniques are studied. The second proposed scheme is a type-II hybrid ARQ scheme in which the level of coding depends on the current noise level and the size of transmitted frame is contrasted to traditional Forward Error Correction (FEC) coding system in which the code rate is usually fixed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available