Patent ID: 6792035
Filing Date: 2004-09-14
Classification: H04B

Abstract:
A method for reducing the effect of multipath propagation of a code-modulated spread-spectrum signal on the identification of a directly propagated signal component, said multipath propagation occurring during transmission of said code-modulated spread-spectrum signal over a wireless link from a transmitter to a receiver, the method comprising performing the following steps at the receiver:receiving the code-modulated spread-spectrum signal, using at least one reference code (r(x)) corresponding to a code used in modulation of the code-modulated spread-spectrum signal to form n reference signals having different code phases, and performing a correlation between the received signal and each of the n reference signals thus formed to produce n correlation values representative of a cross-correlation function, characterized in that the method further comprises the steps of: performing a first time-to-frequency domain transformation on the n correlation values to form n first transform results, forming a frequency-domain divider function representative of a cross-correlation function that would be obtained by said correlation step in the absence of multipath propagation and performing a deconvolution step, by dividing said first transform results by said divider function to form a division result comprising n values.