LINEAR CORRECTION BASED ON FOURIER TRANSFORM FOR CODE DIVISION MULTI ACCESS DOWNLINK Russian patent published in 2008 - IPC H04B7/216 

FIELD: radio communications, possible use for receiving signal in code division multi access mobile communication systems, wherein received signal is separated from other, interference signals by linear correction algorithm that allows to evade matrix inversion.

SUBSTANCE: in accordance to the invention, during receipt of code division multi access signal, receiving device performs simplified linear correction process, which excludes necessity of inversion of correlation matrix. In case of single antenna receipt, correlation matrix is approximated well by circulant matrix, diagnosed by fast Fourier transform operations, making it possible to perform, instead of direct matrix inversion with complexity O(L_F ³), two fast Fourier transforms and one reverse fast Fourier transform, having complexity O(3/2L_FlogL_F). Extension of the method includes usage of multi-antenna receiving system with increased quantization frequency.

EFFECT: increased interference resistance.

9 cl, 9 dwg