Viterbi decoding method and decoder capable of eliminating phase

Details Viterbi decoding method and decoder capable of eliminating phase Viterbi decoding method and decoder capable of eliminating phase

1995-07-19

1998-03-03

Chin, Wellington

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375262, 329345, H04L 8706

Patent

active

057243948

ABSTRACT:
In a Viterbi decoder and a Viterbi decoding method, a modulating method and a phase of a carrier wave, employed in a transmitter apparatus can be automatically followed up in a receiver apparatus. The Viterbi decoder is comprised of a phase shifting circuit for shifting a phase of a reproduced carrier wave of a reception signal in response to a phase-shift control signal, thereby producing a phase-shifted signal; a distance calculating circuit for receiving the phase-shifted signal to calculate a square Euclidean distance between a signal point of the phase-shifted signal and a signal point defined in a predetermined modulating method; path metric calculator for calculating a path metric with respect to each of the phases from the calculated square Euclidean distance value; a selector means for selecting a minimum value of the path metric for each of the phases; and a phase-shift control signal producing circuit for producing the phase-shift control signal used to control the phase shifting means in such a manner that the phase of the reproduced carrier wave of the reception signal is set to a phase corresponding to the minimum path metric value.

REFERENCES:
patent: 4578800 (1986-03-01), Yasuda et al.
patent: 5095392 (1992-03-01), Shimazaki et al.
patent: 5113411 (1992-05-01), Yoshida et al.
patent: 5119243 (1992-06-01), Shimazaki et al.
patent: 5457705 (1995-10-01), Todoroki

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