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In LTE cellular networks, the pathloss impacts the performance of the uplink channel power control. Therefore, power control algorithms can achieve good performance on the location where user equipment (UE) is not power limited. The baseline parameter setting of the fractional pathloss power control is valid for some scenarios, however, it is a challenging issue to improve the cell edge throughput...
Wireless Ad hoc network consists a set of mobile or immobile nodes. This network provides wireless services for different nodes without any fixed infrastructure. Quick and economical deployment of ad hoc networks yields its well desirability for different applications. One of the most significant issue in resource management of wireless ad hoc networks is power control. It should be done in a rational...
Compared to current mobile networks, next-generation mobile networks are expected to support higher numbers of simultaneously connected devices and to achieve higher system spectrum efficiency and lower power consumption. To achieve these goals, we study the multi-sharing device-to-device (D2D) communication, which allows any cellular user equipment to share its radio resource with multiple D2D devices...
Network densification is a promising technology to increase 5G system capacity, including large scale multipleinput multiple-output (MIMO) and ultra-dense network. Energy saving and resource utility are the key issues for the densified OFDM system. However, most of previous studies do not taking account of the effect of resource utility in the SINR model, e.g. the load factor. In this paper, we firstly...
In this paper, we investigate the energy-efficient power control for device-to-device (D2D) communications underlaying cellular networks with max-min fairness, where uplink resource blocks allocated to one cellular user equipment are reused by multiple D2D pairs to improve the frequency reuse factor, and the minimum individual energy efficiency (EE) is maximized. This is a generalized fractional programming...
Underlay device-to-device (D2D) communication is envisaged to improve the spectral efficiency in cellular networks. One main challenge in this technology is how to control transmit powers from D2D pairs in order to preserve a certain quality of service requirement for cellular users. To address this challenge, this paper proposes a price-based power control game, by which transmit power of D2D pairs...
In this paper, we present a big-data self organizing network (Bi-SON) framework aiming to optimize energy efficiency of ultra-dense small cells. Although small cell can enhance the capacity of cellular mobile networks, ultra-dense small cells suffer from severe interference and poor energy efficiency. The self organizing network (SON) can automatically manage and optimize the system performance. However,...
Device-to-Device (D2D) communication underlaying cellular networks is expected to bring significant benefits for resource utilization and cellular coverage. However, the resource allocation and power control needs elaborate coordination, otherwise it may cause severe interference between D2D user equipment (DUE) and cellular user equipment (CUE). In this paper, we study the joint radio resource allocation...
In this paper, we investigate D2D underlaying cellular networks in which both the D2D links and the cellular downlink links have secrecy requirement. We aim to enhance the secrecy sum rate of D2D pairs(DUs) and cellular users(CUs)by sharing the downlink resources of cellular users and exploiting artificial noise. We achieve the design principle for the downlink signal and artificial noise, which provide...
In LTE cellular network, the uplink power control (PC) mechanism consists of two parts, an open loop (OL) PC and a closed loop (CL) PC. The OLPC determines the initial settings of the network while the CLPC settings aim to correct the errors in the OLPC configurations. In most of cellular networks, OLPC is adopted because of its implementation simplicity and low operation cost. In this work, we investigate...
Device-to-device (D2D) communication can effectively meet the demands of high data rate by providing a direct link between two mobile users in cellular networks. In this paper, we analyze the optimal power control for energy efficiency of D2D communication underlaying cellular networks. Based on the stochastic geometry, we firstly use the homogeneous Poisson point process (PPP) to characterize the...
In this paper, the capacity of underlaying cellular networks is analyzed by considering the impact of Device-to-Device (D2D) mode, which is shown to be capable of substantially enhancing the sum transmission rate of the cellular network. Based on the theory of stochastic geometry, the successful transmission probabilities of both the D2D users and the conventional cellular users(CUs) are derived,...
This paper studies the performance of hierarchical modulation-based image transmission in device-to-device (D2D) cellular wireless networks under constraints on both transmit and interference power levels. Hierarchical quadrature amplitude modulation (HQAM) is considered in which high priority (HP) data is protected more than low priority (LP) data. In this setting, closed-form bit error rate (BER)...
Device-to-Device (D2D) communications and small cell networks, as promising technologies to improve spectral efficiency and system throughput for future cellular networks, have received increasing attentions. In this paper, we model D2D communications in the two-tier heterogeneous macro-small cell networks. We propose not only two novel resource sharing strategies for D2D users, namely dedicated resource...
Device-to-Device (D2D) communication has advantages of improving the spectral resource efficiency. But unfortunately, it brings about interference and potential secrecy hazard. In this paper, a Stackelberg game based power control algorithm is provided to enhance the physical layer security underlaying D2D communication by utilizing the interference. Then, a mathematical model based on Stackelberg...
Orthogonal frequency division multiplexing (OFD-M)based cognitive radio networks (CRNs) is a promising paradigm to increase spectrum efficiency and achieve flexible resource allocation. However, previous works either lack the consideration of channel uncertainties or ignore the effect of imperfect spectrum sensing. In this paper, we focus on the power control for a downlink OFDM-based CRN with the...
This paper proposes a novel distributed power adjustment algorithm for heterogeneous cellular networks, in which a base station adjusts the transmission power based on the signal quality of neighboring base stations. The aim of the proposed algorithm is to achieve a fair resource allocation among its users with minimal information exchange. An important aspect of the proposed algorithm is that channels...
This study proposes a novel intelligent transmit power control and receive antenna selection (ITPCRAS) scheme to minimize the uplink power and co-channel interference in high-mobility communication environments with UL MIMO-SC-FDMA transceivers. In the proposed method, an ANFIS-based power controller (APC) is used to adjust the transmit power adaptively so as to minimize the user equipment (UE) transmit...
In a D2D-enabled cellular system, not only can communications be relayed through the base station, but also closely located pairs are allowed to communicate directly over a D2D link, to support short-range data-intensive services. In this paper, we first formally state the problem of system throughput maximization subject to a given feasible lower bound for the users' SINRs in a D2D-enabled cellular...
Two-tier networks consisting of macrocell and femtocells are provided as a solution to increase capacity and improve indoor coverage of cellular networks. In two-tier networks, when the spectrum is shared by macrocell and all of femtocells, the cross-tier and co-tier interference should be taken into account. In this paper, we investigate the power control problem of minimizing the aggregate transmit...
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