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Optimal Power Allocation in Device-to-Device Communication with SIMO Uplink Beamforming

In order to provide local services, one approach is to use license exempt spectrum of wireless local area networks (WLANs). Another approach is data transmission on a licensed band in a coordinated and planned network. Toward this second approach, device-to-device (D2D) communication has been studied extensively, where nearby users can transmit data directly to each other with reused cellular resource blocks. We discuss about the technology trend, applications, and the future of  D2D communication. Furthermore, we formulate and solve the following problem: