METHOD AND APPARATUS FOR DETERMINING THE INITIAL VALUES OF THE COEFFICIENTS OF A COMPLEX TRANSVERSAL EQUALIZER

摘要

METHOD AND APPARATUS FOR DETERMINING THE INITIAL VALUES OF THE COEFFICIENTS OF A COMPLEX TRANSVERSAL EQUALIZER A method for determining the initial values of the coefficients of a complex transversal equalizer in a synchronous data transmission system employing Double Side Bankd-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 DSC-QC modulation technique.