Radio communicati0n system

A radio communication system comprises a communication channel between a transmitter ( 108 ) having a plurality of antennas ( 110 ) and a receiver ( 114 ) having at least one antenna ( 110 ). In such a system the communication channel comprises a plurality of paths ( 112 ) having a range of characteristics. Data for transmission is generated by one or more applications ( 102 ) and has one or more categories assigned to it, for example by the addition of tags by a tagging block ( 204 ) indicating its importance or other requirements. Depending on the assigned categories and the characteristics of the paths ( 112 ), the data is mapped to one or more of the transmitter's antennas ( 110 ) to select a suitable transmission path ( 112 ).