Consider a wireless communication system that employs multiple transmitting and receiving
antennas. We assume that there are NT transmitting antennas and NR receiving antennas.
As illustrated in Figure 11.1, a block of NT symbols is converted from serial to parallel and each symbol is fed to one of NT identical
modulators, where each modulator is connected to a spatially separate antenna. Thus,
the NT symbols are transmitted in parallel and received on NR spatially separated receiving
antennas. In this section, we assume that the NT symbols are uncoded.
In the formulation of a MIMO system as described above, we observe that the
transmitted symbols on the Ny transmitting antennas overlap totally in both time and
frequency. As a consequence, there is interchannel interference in the signals
received from the spatial channel.
Reference,
1. <<Contemporary Communication System using MATLAB>>