Device for making decisions by estimating the viterbi algorithm

Details Device for making decisions by estimating the viterbi algorithm Device for making decisions by estimating the viterbi algorithm

1995-05-15

1999-01-26

Pham, Chi H.

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

371 437, H03D 100

Patent

active

058645896

ABSTRACT:
In a mobile radio system including mobile terminals each terminal comprises, on the receiving side, a unit using the Viterbi algorithm for equalization or for decoding the received signals after demodulation. A decision device of this system calculates the mean and the standard deviation of the metrics of each branch of the Viterbi algorithm, determines a quality level of a transmission parameter corresponding to the results of this calculation and compares the estimated quality level and a required quality level of the parameter in order to produce a decision signal supplied to a decision unit which can modify one or more transmission characteristics.

REFERENCES:
patent: 5287385 (1994-02-01), Sugawara et al.
Proakis, John G., "Digital Communications"-McGraw Hill Book Company, 1988.
Wozencraft et al., "Principles of Comunications Engineering" John Wiley & Sons, 1985.
Signal Processing. European Journal Devoted to the Method, and Applications of Signal Processing, vol. 25, No. 3, Dec. 1991, Amsterdam, pp. 307-318, Morgul eet al. "Decision Directed Channel Parameter Estimation and Tracking Using Erroneous Detectors".
IEEE Journal on Selected Areas in Communication, vol. 11, No. 7, Sep. 1993, New York, US, pp. 1034-1045, Liu et al., "A Soft-output Bidirectional Decision Feedback Equalization Technique for TEMA Cellular Radio".

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