The performance of the 40 bit frame synchronization sequence adopted for ATCS (automatic train-control systems) is examined in detail. A general expression is derived for the probability of synchronization as a function of the bit error and erasure probability, the overlap n, and the number of bit errors/erasures which are tolerated in the frame sync word. The probability PD of successful frame sync with errors-and-erasures decoding is compared to PD with errors-only decoding. For a given bound on false alarms, a significant improvement in PD is found on random error channels if the receiver contains an erasure zone. An improved frame synchronization scheme which uses the preamble is shown to follow a higher error tolerance for a given false-alarm probability, and thus a higher PD.
Performance of frame synchronization in automatic train control communications systems
Eigenschaften der Rahmensynchronisation bei automatischen Zug-Kommunikationssystemen
39th IEEE Vehicular Technology Conference (IEEE Cat. ; 2 ; 517-522
1989
6 Seiten, 11 Quellen
Aufsatz (Konferenz)
Englisch
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