Method and apparatus for determining the initial values of the c

Details Method and apparatus for determining the initial values of the c Method and apparatus for determining the initial values of the c

1976-11-18

1978-05-09

Malzahn, David H.

Boots, shoes, and leggings

325 42, 333 18, H04B 304

Patent

active

040890619

ABSTRACT:
A method for determining the initial values of the coefficients of a complex transversal equalizer in a synchronous data transmission system employing Double Side Band-Quadrature Carrier (DSB-QC) modulation on a transmission channel having variable distortion from message to message is disclosed. The coefficients are derived from training sequences which consist of periodic pseudo-random sequences of complex numbers having a periodic autocorrelation function, all the coefficients of which except the first are zero. The amplitude of all complex numbers of the sequence is constant. Sequences with these characteristics are identified as CAZAC sequences. With the exception of a training sequence generator and a coefficient generator the system utilized is a conventional data transmission system utilizing the DSB-QC modulation technique.

REFERENCES:
patent: 3715666 (1973-02-01), Mueller et al.
patent: 3723911 (1973-03-01), Forney
patent: 3978407 (1976-08-01), Forney et al.
patent: 4006352 (1977-02-01), Sato

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