Abstract:
A promising way of achieving very high data rates is to use multiple antennas at both the
transmitter and the receiver( MIMO) [I]. Maximal exploitation of antenna arrays in wireless
communicalion necessitate accurate yet tractable model of the MIMO channel that couples the
transmitter and receiver. Much of indoor modelling effort reported in literature to date has
characterised the MIMO channels either by measurement [2], or by using complex ray-tracing
methods [3]. However, efficient MIMO models that take into account realistic indoor channel
parameters are still scarce. In this paper, we aim to develop a new indoor MIMO model that
combines the accuracy of wave propagation analysis with efficiency of a statistical description
of multipath. We propose here a two-ring indoor MIMO channel representation based on single
bounce scattering that provides a tractable channel characterization. This model takes into
account most characteristics of indoor scattering environment, and offers a transparent
interpretation of the effects of indoor scanering and array characteristics on channel capacity
md diversity. To model a realistic no-isotropic scattering from an indoor environment, we
utilize von Mises distribution to represent the angle of arrival (AOA) at the receiver and angle
of departure (AOD) at the transmitter. The model is then used to study the influence of
propagation and antenna factors such as AOA, delay spread, and antenna array interelement
spacing etc on thc capacity of the indoor MIMO channel. Thc capacity obtained using the
proposed two-ring model is also compared wifh the measured results obtained from the
literature [4].
