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Energy efficient cognitive radio networks can simultaneously improve spectrum efficiency (SE) and energy efficiency (EE) of wireless communication networks. This paper studies energy efficient spectrum sensing interval, spectrum sensing energy and transmit power allocation scheme of the secondary user (SU) in CR networks. The EE maximization problem subject to the transmit power constraint and average...
The connectivity in wireless communication is established based on the receiving signal strength, which is affected by distance, interference, noise, mobility, etc. As a result, a node has a limited coverage area. Therefore, the connectivity becomes one of the significant limitations in multi-hop wireless networks. The relaying concept and transmission power control were introduced to overcome the...
Non-orthogonal multiple access (NOMA) is a promising radio access technique for the next generation (5G) cellular communication. The optimal power control, user scheduling, and resource allocation scheme to maximize the overall network throughput of downlink NOMA systems is investigated in this paper. A practical imperfect channel state information (CSI) model is adopted in our investigation where...
This paper investigates the link selection policy for secure communications over a buffer-aided two-hop communication link. It is assumed that a source wishes to send information to a destination with the aid of a trusted half-duplex relay node compromised by a passive eavesdropper, and that there is no direct link between the source and the destination. The buffer-aided relay forwards the information...
The increasing demand for underlaying cellular network has benefit form Device-to-Device (D2D) communication, where one need to apply productive plan for resource allocation to increase system capacity and mitigate interference. The bipartite graph matching strategy is used for optimizing the resource allocation among all other strategies; Kuhn-Munkres (KM) is one of algorithm applied to increase...
To meet the imperative need for ubiquitous mobile communication, the infrastructure of the next-generation mobile system, i.e. 5G, is developing toward a densely distributed cellular network with multiple tiers of base stations and access technologies serving users with different mobility styles and variant bandwidth demands. Therefore, strategy of power control and interference mitigation is becoming...
This paper considers queue-driven, real-time interference mitigation aiming to maximize wireless network throughput. A best-response power control algorithm is derived from successive convex approximations, and a single power update is performed at each scheduling interval. In the high-SINR regime, the power control algorithm achieves maximum network throughput. Extending the approach to general SINR...
Future 5G mobile networks are expected to support high numbers of simultaneously connected devices and to achieve high system spectrum efficiency at low power consumption. To attain these goals, device-to-device (D2D) communication is a key component. We allow any cellular user equipment to share its radio resource with multiple D2D devices and then develop the MiSo algorithm, which considers spectrum...
This paper develops a generalized channel-aware power control scheme to enhance the multi-packet reception (MPR) capability for random access. In the proposed scheme, each user randomly selects its transmit power with a probability in accordance with a distribution function based on its own channel state. For two-user systems, we show that the optimal power distribution function has a simple discrete...
In this article the cross-platform software and hardware solution for LTE key performance indicators optimization are developed. There are two important conflicting indicators are explained and optimized — LTE user's throughput and cell throughput versus different power control parameter settings such as nominal power per resource block and alpha for fractional power control. The results graphically...
The vast amount of the machine type communication devices (MTCDs) in machine-to-machine (M2M) communications and their limited energy budget are the crucial challenges to transmission scheme design. This paper proposes an energy-efficient power control and time scheduling scheme in M2M communications with non-orthogonal multiple access (NOMA) and energy harvesting. User equipment (UEs) are configured...
In this paper, we investigate the energy efficiency (EE) and spectral efficiency (SE) tradeoff in multi-cell heterogeneous networks (HetNets). Our objective is to maximize both EE and SE of the network while satisfying the rate requirement of users. We use multi-objective optimization techniques to define the objective function. We propose a three-stage algorithm in this paper. First, we select the...
Ambient energy harvesting has emerged as a promising technique to improve the energy efficiency and reduce the total greenhouse gas emissions for green relay networks. In this paper, we study the joint relay selection and power control problem for the Decode-and-Forward energy-harvesting wireless relay network. In particular, the problem formulation is to maximize the end-to-end system throughput...
Interference management through power control in wireless ad hoc networks has both the hidden terminal problem which induces collisions, and the exposed terminal problem which prohibits concurrent transmissions. Both problems are caused by the varied interference range induced by the adjusted transmission power. Through observing that the nodes adopt the power control mechanism induces collisions...
The S-ALOHA (i.e. slotted-ALOHA) protocol is recently regaining interest in Lower Power Wide Area Networks (LPWAN) handling M2M traffic. Despite intensive studies since the birth of S-ALOHA, the special features of M2M traffic and requirements highlight the importance of analytical models taking into account performance-affecting factors and giving a thorough performance evaluation. Fulfilling this...
Device-to-device (D2D) communication is a promising technique to enhance spectrum efficiency of the cellular systems by enabling direct transmissions between end users close to each other. However, the arising interference issue should be carefully addressed to obtain the potential spectrum efficiency gains. In this paper, we develop an approximate interior point method to maximize the sum throughput...
In this paper, we consider a point-to-point link between an energy harvesting transmitter and receiver, where neither node has the information about the battery state or energy availability at the other node. We consider a model where data is successfully delivered only in slots where both nodes are active. Energy loss occurs whenever one node turns on while the other node is in sleep mode. In each...
In this paper we present a data-driven power control (DDPC) approach to improve total cell throughput and energy efficiency of ultra-dense femtocells. Although femtocells can increase the capacity and coverage in an indoor environment, ultra-dense femtocells may consume a lot of energy and generate severe interference. We investigate a data-driven clustering approach to reduce co-tier interference...
The rise in mobile data traffic demands from indoor users (UEs) coupled with poor cellular coverage in indoor environments, triggering the growth of Femto cell deployments. However, due to densification of Femtos, frequency reuse one, and lack of coordination among Femtos in LTE HetNets, cell-edge users of Macro cells, who are in the vicinity of Femtos, get affected by cross-tier interference of the...
Multiple overlapping transmissions cause a serious performance degradation in dense wireless local area network (WLAN) due to increased level of interferences. The issue of interference management becomes extremely challenging particularly for IEEE 802.11 b and g standards where the number of non-overlapping channels (NOCs) is only 3. Power control at the access points (APs) plays a major role to...
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