Method and apparatus for adapting a viterbi algorithm to a chann

Details Method and apparatus for adapting a viterbi algorithm to a chann Method and apparatus for adapting a viterbi algorithm to a chann

1990-10-19

1992-11-17

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 18, 375 99, H03H 730

Patent

active

051649616

ABSTRACT:
An equalizer having an adaptive viterbi analyzer and channel estimation circuits connected to each a state of the viterbi analyzer. The equalizer receives a filtered and sampled signal which during its transmission has been subjected to time dispersion. For each state, the estimation circuits each estimate a partial impulse response for the communications channel. The iterative estimation process begins by determining transition error signals between a old and a new state with the aid of a preceding partial impulse response. The estimation circuits estimate the current partial impulse responses for the new state using the part partial impulse responses, the transition vectors, and the transition error signals selected by the viterbi analyzer. The partial impulse responses are used to estimate symbols included in the received signal.

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patent: 4965254 (1990-02-01), Bergmans
patent: 5040191 (1991-08-01), Forney, Jr. et al.
"Adaptive Maximum Likelihood Sequence Estimation for Digital Signaling in the Presence of Inter Symbol Interferences", by F. R. Magee, Jr. and J. G. Proaks, IEEE Trans. on Info. Theory, Jan. 1973, pp. 120-124.
"Maximum Likelihood Sequence Estimation of Digital Sequences in the Presence of Inner Symbol Interference", by G. D. Forney, Jr. IEEE Trans. of Info Theory, Mar. 1973, pp. 363-378.
"The Viterbi Algorithm", by G. D. Forney, Jr., IEEE Trans. on Info. Theory, Mar. 1973, pp. 268-278.

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