Method and apparatus for fast determination of initial transvers

Details Method and apparatus for fast determination of initial transvers Method and apparatus for fast determination of initial transvers

1976-07-01

1977-09-06

Smith, Jerry

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Transfer mechanism

Traveling pawl

325 42, 333 18, 333 28R, 333 70T, G06F 1534, H04B 314

Patent

active

040470130

ABSTRACT:
A method for determining the initial values of the coefficients of a transversal equalizer for a synchronous data transmission system, wherein a training sequence is transmitted to allow the equalizer coefficients to be adjusted to optimum initial values. According to the method, a sequence (v.sub.i) of L elements v.sub.i, having a periodic autocorrelation function, only the first coefficient of which is not zero, is derived from a periodic binary pseudo-random sequence (u.sub.i) of L binary elements u.sub.i having a periodic autocorrelation function, the first coefficient of which is equal to L and each of the other coefficients are equal to -1. Then, the sequence (v.sub.i) is transmitted through the transmission channel and the initial values of the equalizer coefficients are derived from the received sequence. In a preferred embodiment of the invention the initial values of the equalizer coefficients are derived from the received sequence through a direct method which involves the calculation of the autocorrelation matrix of samples of the transmission channel impulse responses.

REFERENCES:
patent: 3659229 (1972-04-01), Milton
patent: 3715666 (1973-02-01), Mueller et al.
patent: 3864632 (1975-02-01), Chang
patent: 3914691 (1975-10-01), Meadors, Jr.
patent: 3978407 (1976-08-01), Forney, Jr. et al.

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