LOGIC FOR QUICK CALCULATION OF SQUARE ROOT FOR CORRECTION IN MIMO SYSTEM Russian patent published in 2012 - IPC H04B7/08 H04W74/00 

FIELD: radio engineering.

SUBSTANCE: using several transmitting and/or receiving antennas and a MIMO technology makes it possible to transmit several data flows at one carrier frequency. In process of correction the receivers may separate data received at one tone into individual data flows. In a general case the correction process is related to intensive calculations. Corrector functions include operations with a reverse matrix, which may be calculated using the method of quick calculation of square root; however this method for quick calculation of square root is related to a considerable volume of calculations for a group of matrices, besides, the size of used matrices increases as the number of transmitting and receiving antennas increases. When using a modification of a method for quick calculation of square root, it is possible to select and update only the subset of matrix elements to reduce volume and/or complexity of calculations. The update comprises detection of a rotation matrix in compliance with a reflection method by Householder.

EFFECT: improved noise immunity.

20 cl, 12 dwg