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The massive multiple-input multiple-output (MIMO) has been proposed as one of the key technologies for the next generation wireless communication systems. Uniform planar array (UPA) antenna structures have been considered in many researches because it is able to deploy a large number of antennas in a relatively small area. There are lots of performance superiorities in massive MIMO systems. However,...
In this paper, we consider cooperative spectrum detection based on energy detection in distributed antenna systems. Soft combination of the observed energies from different cognitive radio users is investigated. Based on the Neyman-Pearson criterion, we obtain an optimal soft combination scheme that maximizes the detection probability for a given false alarm probability. We derive closed-form expressions...
In orthogonal frequency division multiplexing (OFDM) systems, multipath fading channels introduce interference between adjacent symbols. Although the interference degrades the system performance considerably, it also provides the information of channel impulse response (CIR) length to us. Therefore, based on the estimation of interference in the cyclic prefix (CP) interval, we can use the minimum...
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