Digital communications tree searching detection

Details Digital communications tree searching detection Digital communications tree searching detection

1977-04-25

1978-05-02

Safourek, Benedict V.

325320, 325324, H04L 2710

Patent

active

040877523

ABSTRACT:
Digital data which is correlatively encoded into discrete plural states and transmitted by modulating a carrier signal whose phase in each baud interval is a function of the data is detected through a tree searching technique which recursively determines the maximum metric for each of the states during each baud interval and generates a data bit stream therefrom. The maximum metric is determined by computing the transition metric for each possible path into a state from a comparison of the baseband signal with a reference signal generated therefrom and adding it to the state metric for the prior state from which the path originated to derive a path metric and then selecting the maximum path metric for each state designated survivor decision metric. The data bit stream, there being one for each state, is generated by updating the data bit stream corresponding to its associated survivor metric by deleting the oldest bit therefrom and adding as the newest bit, the bit value associated with the survivor metric path.

REFERENCES:
patent: 3623098 (1971-11-01), Jones et al.
patent: 3891959 (1975-06-01), Tsuji et al.

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