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We consider nonlinear transceiver design for downlink multiuser multi-antenna secure communications with an external multi-antenna eavesdropper. The multi-antenna transmitter simultaneously transmits confidential-message-bearing signals and artificial noise (AN) using nonlinear Tomlinson Harashima precoding based on the limited channel state information feedback. For the proposed nonlinear secure...
Current large-scale computing services, such as online social networking and web searching, make the wired links in the data centers with an Ethernet infrastructure oversubscribed. Therefore, researchers consider to augment the data centers with wireless communication, called a hybrid data center network (HDCN), to improve the communication flexibility and network capacity. In this paper, we investigate...
With the growing demand on wireless multimedia services and omnipresent access, the energy consumption rises sharply. Consequently, energy efficiency (EE) has become an essential problem in the design of green radio. In order to reduce computational complexity, we separate the resource allocation into two steps: subcarrier allocation and power allocation. After subcarrier allocation, we adopt biogeography-based...
In this paper, we focus on a problem of joint subcarrier and rate allocation for an orthogonal frequency division multiple access (OFDMA) full-duplex (FD) system. The goal is to maximize the system's successful transmission rate (referred as goodput) subject to power constraints at the base station (BS) and uplink users alone with subcarrier constraints. Imperfect channel state information (CSI) at...
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