Pulse or digital communications – Repeaters – Testing
Patent
1981-12-03
1984-05-08
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 67, 332 16R, H04L 2718
Patent
active
044479085
ABSTRACT:
A communication method and arrangement are disclosed which provide, for a trellis encoding process in the transmitter and a maximum-likelihood decoding process in the receiver, an additional fifth state (ZS) in addition to the usual four coding states (S0 . . . S3). The fifth state is entered in the transmitter at the end of transmission when a particularly selected escape symbol from a set of four escape symbols (E0 . . . E3) each associated to one of the four normal coding states is sent by an encoder supplement (15). In the receiver, a stop signal indicating end of transmission is only generated when, after the usual decoder delay, a path decoder (63) determines that an escape symbol was received, and a trellis decoder (61) indicates the fifth state (ZS) to be the most probable one. This enables rapid and secure determination of the end of a transmitted sequence without the need for additional transmission symbols or decoder cycles.
REFERENCES:
patent: 3955141 (1976-05-01), Lyon et al.
patent: 4077021 (1978-02-01), Csajka et al.
patent: 4334312 (1982-06-01), Yoshida
patent: 4347616 (1982-08-01), Murakami
Chevillat Pierre R.
Ungerboeck Gottfried
Chin Stephen
Duffield Edward H.
Griffin Robert L.
International Business Machines - Corporation
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