A theory of multiple-input/multiple-output (MIMO) system for mobile radio communications

Using n-element arrays for transmission and reception in a radio communication link is one of the recent focuses in wireless communication research. Most of the studies are based on the assumption that the transmitter is in complete ignorance of the channel information. Radio modem designs are often carried out on the basis of average channel characteristics. However, radio communications are seldom simplex and channel information could be readily fed back to the transmitter. We present a transmission and reception theory for such an ideal situation that both the transmitter and receiver have the knowledge of the channel instantaneously and precisely, in the hope that an alternative to the complete statistical treatment can be developed.