Abstract
The independent Rayleigh fading MIMO channel is compared here with a more realistic channel model; specifically the finite scatterers (FS) channel where a finite number of scatterers are each defined by a path gain and angles of departure and arrival. For the case of quasi-static, flat fading where only the receiver knows the channel, capacity CDFs are converted to plots of outage probability as functions of SNR. The losses of the FS channel owing to a lack in channel richness over the ideal independent Rayleigh case are then assessed. For sufficient scatterers, trends in SNR losses as a function of antenna spacing follow a Bessel function which itself is the predicted average correlation between antennas for the FS channel. For sufficient antenna spacing, SNR and diversity order losses reduce quickly as the number of scatterers increases. In summary, informed choice of antenna spacings along with a reasonable number of scatterers can realise the full independent Rayleigh channel diversity order although a small SNR loss appears unavoidable.
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