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In this paper, we study hybrid overlay/underlay spectrum sharing in cognitive two-way relay networks with an opportunistic relay selection scheme. Different from the traditional interference power constraint, we adopt primary users' (PU) outage constraints to guarantee the QoS requirement of a primary system. The exact closed-form expression for the outage probability of a secondary system is derived...
Energy harvesting is becoming a promising technology for future wireless communication network for its potential of saving nonrenewable energy and making the communication environmentally friendly. However, due to the unpredictable and intermittent nature of energy source, the road to the communication system powered solely by harvested energy is plagued with potholes. In this paper, we consider a...
Large-scale user behavior can be used as the guidance for deployment, configuration, and service control in heterogeneous cellular networks (HCNs). However, in wireless networks, large-scale user behavior (in terms of traffic fluctuation in spatial domain) follows inhomogeneous distribution, which brings enormous challenges to energy-efficient design of HCNs. In this paper, the heterogeneity of large-scale...
This paper mainly investigates the problem of radio resource allocation for heterogeneous services transmission in OFDMA-based wireless networks, where the Soft QoS traffics are considered. In communication systems from the users' point of view, utility is a good metric to describe the satisfaction of services, the objective of this paper is to improve the total utility of all the system users, and...
This paper presents a resource allocation framework for the transmission of heterogeneous services in two-hop orthogonal frequency division multiplexing (OFDM) cooperative relay systems. An optimal adaptive power and subcarrier allocation scheme is proposed to maximize the system throughput while satisfying the quality of service (QoS) requirements of both the real-time (RT) and nonreal-time (NRT)...
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