The paper presents a geometry-based MIMO channel model for outdoor-to-indoor applications. The propagation channel model is derived when indoor scatterers are located on a hollow-disk around the user and a distribution of outdoor scatterers exists between the base stati More
The paper presents a geometry-based MIMO channel model for outdoor-to-indoor applications. The propagation channel model is derived when indoor scatterers are located on a hollow-disk around the user and a distribution of outdoor scatterers exists between the base station and the user. The closed-form Cross-Correlation Function (CCF) is derived for the aforementioned scenario. This function depends on various parameters of interest including the distance between the base station and the user, the spacing among antennas elements, and the directions of the antennas elements. The numerical CCF values are obtained with Radiowave Propagation Simulator (RPS) software for the building of Electrical and Computer Engineering School at the University of Sistan and Baluchestan. The results show that considering the outdoor scatterers increases the accuracy of the CCF and the capacity computation significantly.
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In this paper, a procedure for feed placement in a collocated Multiple Input Multiple Output (MIMO) antenna is presented based on characteristic mode theory. The orthogonality of characteristic currents is used to determine optimal feed locations in the presented antenn More
In this paper, a procedure for feed placement in a collocated Multiple Input Multiple Output (MIMO) antenna is presented based on characteristic mode theory. The orthogonality of characteristic currents is used to determine optimal feed locations in the presented antenna. First, characteristic mode analysis is done to determine the resonance modes of the antenna; Then the optimal feed locations are determined to excite these orthogonal modes. Moreover, we modify the shape of the radiation pattern of the antenna by changing amplitude excitation of these modes. It is observed that only by changing amplitudes of the antenna modes and their composition at the desired frequency, the shape and the beam width of the antenna pattern is changed.
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