The Effect of 3D Antenna Radiation Pattern on Narrowband MIMO Capacity : Simulation and Measurement

G. J. Foschini and M. J. Gan have been shown that the use of multiple antennas in both transmitter and receiver, called multiple input multiple output system (MIMO), linearly increases the channel capacity with the number of antennas [1]. The channel model in [2] is based on the angle of arrival (AOA). This model, however, does allow including the radiation pattern into the capacity calculation. The effect of fading correlation without antenna pattern on the MIMO capacity has been studied in [3]. It has been shown that the capacity is reduced when the fading correlation exists [3]. In this paper, we generalize the channel model so that it is able to include 3-dimention (3D) antenna pattern effect on the capacity into consideration. Having the channel model, capacity measurements are performed for omni-direction and direction antennas. The paper is organized as follows. In the next section, the proposed channel model with 3D antenna radiation pattern is discussed for both single and multiple antenna systems. Simulations of the MIMO capacity in various propagation environments are presented in section 3. Section 4 will show about field measurement and results by the MIMO test-bed. Finally, section 5 concludes the paper.