Method of reducing the convergence time of an echo canceller...

Details Method of reducing the convergence time of an echo canceller... Method of reducing the convergence time of an echo canceller...

H - Electricity

04

B

340/72

H04B 15/00 (2006.01) H04B 3/23 (2006.01)

Patent

CA 1211526

27 ABSTRACT: A method of reducing the convergence time of an echo canceller including a transversal filter having N adjustable complex coefficients comprises the following steps: - transmitting a complex training signal constituted by data d(n) transmitted at instants nT, where T is the data interval, having a period LT at least equal to NT and having the following two properties: Image for every integer i such that 1 < i < N - 1, and Image for every integer i such that 0 < i < N - 1; - after the transmission of N data, calculating the coeffi- cients ? of the transversal filter from the sequence formed by the next L data transmitted, in accordance with the expression: Image where ?o represents the N initial coefficients, eR(n) is the difference signal between the received signal and the real output signal of the transversal filter, ?x(n) represents the complex conjugate value of the last N data entering the transversal filter, and .sigma.2 is a constant characterizing the power of each of the transmitted data.

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