Method of and circuit for detecting synchronism in viterbi decod

Details Method of and circuit for detecting synchronism in viterbi decod Method of and circuit for detecting synchronism in viterbi decod

1996-06-27

1998-09-15

Gordon, Paul P.

Excavating

371 3703, 371 3711, 371 46, G06F 1110

Patent

active

058090444

ABSTRACT:
A branch value output circuit checks a preceding state to which a maximum path metric state determined in a Viterbi decoding process by a Viterbi decoder has transited, uses the maximum path metric state, and determines a branch value between transitions. A correlator determines a correlation in each interval between the branch value and soft-decided received data and outputs a correlative value representing the correlation in each interval. A synchronism/asynchronism determining circuit determines whether the received data are in a synchronous or asynchronous condition based on the correlative value in each interval. If the received data are determined to be in an asynchronous condition by the synchronism/asynchronism determining circuit, the synchronism/asynchronism determining circuit supplies a phase control signal to a phase converter. The phase converter changes the phase of the received data in response to the phase control signal. Therefore, it can be detected whether the soft-decided received data are in the synchronous or asynchronous condition, and if the received data are in the asynchronous condition, the received data are controlled into the synchronous condition.

REFERENCES:
patent: 4675871 (1987-06-01), Gordon et al.
patent: 4802174 (1989-01-01), Hiraiwa et al.
patent: 4837766 (1989-06-01), Yoshida
patent: 4918446 (1990-04-01), Yagi
patent: 5208816 (1993-05-01), Seshardi et al.
patent: 5398254 (1995-03-01), Miya et al.
"Improved HF modem using convoultional coding", B. Honary et al., Electronics & Communication Engineering Journal, No. 2, pp. 73-82, Apr. 1992.

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