Configuration manner null of filter coefficient vector of the adaptive transversal filter in the waveform equalization device which uses the adaptive transversal

摘要

PURPOSE:To decide a filter coefficient with high accuracy and high stability with the small arithmetic quantity and short processing time, by selecting the filter coefficient correcting direction vector as a vector conjugate with a co- decentralized matrix of the filter input series and deciding the optimum coefficient vector in a repetitive arithmetic operation. CONSTITUTION:A filter part is formed by connecting the unit delay devices 1 in series by N stages. The outputs of these devices 1 are amplified by a multiplier 2 with use of coefficients hO-hN and then totalized by an adder 4. These filter coefficients hO-hN are decided according to the input signal of each multiplier 2 after the error between the filter output signal yn and the equalization target signal dn is evaluated by a control part 3. Then the correcting direction of the coefficient vector is set in the same direction as the vector conjugate with a co-decentralized matrix of the filter input series. Then the arithmetic operations are repeated by the part 3 to obtain the optimum coefficient vector of the adder 2 with a limited repeating frequency.