Comparison of space and angle diversity techniques for indoor MIMO system

"Angle diversity" and "space diversity" are two methods used in multiple input multiple output (MIMO) systems which have shown huge enhancement in channel capacity comparing to traditional single input single output (SISO) systems. Ideally, channel capacity in independent Rayleigh fading channels scales linearly according to the minimum number of transmitter (Tx) and receiver (Rx) elements. However, in a real indoor environment where a great number of correlated paths exist, this is not exactly true. Therefore, recently many research studies have been focused on measurement, mathematical characterization and numerical simulation of scattering environments. Measurement provides realistic information about the channel; however it requires gathering massive data which is not always possible. Conversely, in most numerical and statistical simulations, channel characteristics are extracted for virtual environments which might not include all realistic aspects of the channel. In this study, ray tracing was used as a tool to model a real indoor scattering environment by considering the details of the study area including shape, size and material