Method and apparatus for decision feedback equalization with red

Details Method and apparatus for decision feedback equalization with red Method and apparatus for decision feedback equalization with red

1992-07-02

1994-03-22

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375103, 3647242, H03K 5159

Patent

active

052971660

ABSTRACT:
A method and apparatus for performing blind mode decision feedback equalization with reduced convergence time. In operation, the decision feedback equalizer (DFE) of the invention receives a transmitted signal x(n) resulting from transmission of an input signal s(n) through a transmission channel and a receive filter. The apparatus includes a DFE feedback loop having an adaptive filter designed to converge rapidly and iteratively during blind mode decision feedback equalization to a best approximation A'(z) of the unknown, combined, transmission channel and receive filter transfer function A(z). In a preferred embodiment, the apparatus includes DFE circuitry for implementing a Widrow-Hoff least-mean-squared adaptation process, including circuitry for generating an input signal replica s'(n) and an error signal e(n) during each iteration of the adaptation process. In this embodiment, the adaptive filter adaptively generates N replica coefficients a'.sub.j (n), where j=1, 2, . . . , N, which define approximation A'(z), and a replica coefficient a'.sub.O (n) which is employed to update the error signal e(n).

REFERENCES:
patent: 4564952 (1986-01-01), Karabinis et al.
patent: 4669092 (1987-05-01), Sari et al.
patent: 4870657 (1989-09-01), Bergman et al.
patent: 5157690 (1992-10-01), Buttle
patent: 5164962 (1992-11-01), Nakai et al.

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