Synchronization detector using path metric and branch metric val

Details Synchronization detector using path metric and branch metric val Synchronization detector using path metric and branch metric val

1989-10-24

1991-09-17

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

375114, 371 43, 371 46, H04L 2706

Patent

active

050501917

ABSTRACT:
Synchronization conditions of a Viterbi decoder are detected using the differences between minimum branch metrics and corresponding minimum path metrics. In accordance with the invention, zero differences are monitored, non-zero differences are monitored and weighted, and the monitoring is used to detect in-synchronization or out-of-synchronization condition of the decoder. More particularly, the differences are non-linearly mapped (F3) into a value in a first set for some differences or a value in a second set for the other differences. In accordance with the method of synchronization detection, an accumulator, counter or indicator is initialized (F1) to an initial value and as the mapped values are produced in sequence, they are sequentially summed (F5) with the value of the accumulator, counter or indicator so as to continually update the sum. The value of the accumulator, counter or indicator is compared to an out-of-synchronization threshold and to an in-synchronization threshold (F6, F7). Each time the value of the counter, accumulator or indicator reaches or exceeds the value of the out-of-synchronization threshold, an out-of-synchronization status is declared (F9) and the counter, accumulator or indicator is returned to its initialized value, and the process continues.

REFERENCES:
patent: 4601046 (1986-07-01), Halpern et al.
patent: 4641327 (1987-02-01), Wei

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