Sensing based precoding optimization in cognitive MIMO spectrum sharing system
认知MIMO频谱共享系统中基于感知的预编码优化

This paper proposed a spatial spectrum sharing strategy based on temporal spectrum sensing. It performed the spectrum sensing first in time domain; the secondary communication could start immediately if the primary user was not presented. Otherwise, it needed regulate the beam direction and transmit power to reduce the possible interference to the primary users. Specifically, it formulated the optimization problem to minimize the MSE of the secondary link with optimal precoding matrix, subject to the interference constraint of the primary users. In addition, it studied the impact of sensing result with hard decision and soft decision on precoding optimization. The simulation result shows that the MSE performance of the proposed strategy based on sensing is superior to the conventional strategy; besides, the spectrum sharing method with soft sensing surpasses the one with hard decision.