B A Rx Tx C 0 1 2 3 Thµnh phÇn LOS Huíng chuyÓn ®éng B A Rx Tx C 0 0 1 1 2 2 3 3 Thµnh phÇn LOS Huíng chuyÓn ®éng d d d + dtdh ),( dtdh ),2( dth ),0( )(tx )(ty