ABSTRACT
This chapter focuses on the Shannon capacity of multiple-input multiple-output (MIMO) channels, and on the design principles for practical high-throughput MIMO systems. The Shannon capacity for the MIMO channel is the maximum of the mutual information between the input and the output vectors. The capacity of the diagonalized MIMO is the same as that of the original MIMO. In practice, maximum likelihood detectors can be used in MIMO systems with few antennas, while reduced complexity suboptimal detectors are suitable for increasingly larger systems. For the up-link, since the users terminals are not connected, the situation is like for single user MIMO without channel state information at the transmitter. The design can be extended to the case when the user terminals are equipped with multiple antennas. In receiver diversity systems the presence of strong correlation removes the benefits of using multiple antennas. The same is true for high-capacity MIMO links.
