The sections in this article are
Properties Of Meteor‐Burst Communication Systems
The Meteor‐Burst Channel
Performance Modeling and Characterization
Coding and Modulation For Meteor‐Burst Systems
The erasure of unreliable symbols prior to decoding can significantly improve the performance of frequency-hop communications with Reed-Solomon decoding. Two methods are consideTed in this paper for obtaining side information which can be used to deciare erasures. One method declares erasures based on the number of errors made in demodulating a known sequence of test symbols. The second method, which is a special form of concatenated coding, attaches a parity check symbol to subsets of code symbols and declares erasures when errors are detected by the parity check code. The performance of each of these methods is evaluated for frequency-hop communications over channels with Rayleigh fading, partial-band interference, and thermal noise.
Erasure-generation techniques are investigated in conjunction with symbol interleaving as methods to improve the performance of meteor-burst communication systems. Erasure generation via Viterbi's ratio-threshold test (RTT) and a Bayesian scheme are both considered. It is found that a system using fixedrate coding, interleaving, and erasure generation can significantly outperform more complex variable-rate coding schemes which do not use erasures.
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