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By Sven Eickenberg

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In some situations, such as fixed wireless systems, although the transmitter does not have access to instantaneous CSI, it can acquire knowledge of the spatial correlation properties of the channel fading. This is possible because the spatial fading correlation properties are locally stationary. For blind transmission systems in which the channel correlation is known, we propose the stochastic water-filling power allocation strategy. The stochastic water-filling power allocation is inspired by the conventional water-filling procedure, and is computed using a procedure described below.

This can be seen in Fig. 3-7(b). Thirdly, we examine the effect of the SU antenna spacing dr. Fig. 3-8(a) shows the ccdf of channel capacity with hexagon antenna arrays in the large angle spread setting Fig. 3-8(b) and Fig. 3-8(c) display versus dr in the large and small angle spread settings, respectively. The ccdf curves of channel capacity become steeper as dr increases. This results in an improvement in but such an improvement is not nearly as significant as the capacity improvement while increasing dt.

Fig. 3-7(b) and Fig. 3-7(c) display the relation between and dt for the three types of antenna array settings in the large and small angle spread settings, respectively. Given a fixed dt, the capacity of a (7, 7) system with broadside linear antenna array is always higher than that of a (7, 7) system with hexagon antenna array which, in turn, is always higher than that of a (7, 7) system with inline linear antenna array. 3, we showed that the effectiveness of reducing the fading correlation by increasing the BS antenna spacing along the axes perpendicular and parallel to the arriving waves are different.

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