The impact of complexity in MIMO channel models

In recent years there have been a proliferation of channel models suggested for MIMO systems. In this paper we take a look at the impact of model complexity on channel behaviour and on performance measures of systems operating in these channels. In particular we investigate whether large increases in channel complexity are justified or if simple models will lead to similar results and conclusions. We take the simplest channel model, which gives both spatial and temporal correlation, and compare it to a complex industrial model developed by the 3GPP. We compare the two models in terms of the spatial and temporal correlation of the channel. In addition, we look at the temporal correlation level crossing rate and average fade duration of the link capacity in these channels. This gives us an opportunity to assess the impact of channel differences on a performance measure of interest.