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In LTE and LTE-Advanced small cells (i.e., femtocells) have shown great influence in ensuring higher quality of service (QoS). For 5G they will continue to play a vital role as well. In this paper we present an adaptive resource allocation (i.e., bandwidth and transmit power of femtocells) scheme which tries to mitigate the cross tier interference between femtocell and macrocell, ensuring overall...
Device-to-Device (D2D) communications underlaying cellular communications can increase resource utilization, system capacity, and interference, while increasing quality of service (QoS) for cellular and D2D users. In this paper, we design a non-cooperative cross-layer repeated game, which jointly optimizes mode selection (i.e. either operating in cellular mode or reuse mode) at the network layer and...
Device-to-Device (D2D) communication is a promising technology in the next generation (5G) cellular network as it can significantly improve the system performance by leveraging the proximity of communications and reusing cellular frequency resources. However, this benefit may not be fully exploited if the co-channel interference among D2D users (DUE) and cellular users (CUE) is not properly tackled...
This paper investigates the power control problem for broadcast vehicular communications in the presence of adjacent carrier interference (ACI). First, we study the impact of ACI on vehicle-to-vehicle (V2V) communications and conclude that the ACI indeed significantly affects the reliability of V2V links. Second, we formulate a power control optimization problem for vehicles to reduce the negative...
The device-to-device (D2D) communication has become one of the most promising methods for alleviating the deficiency of wireless spectrum. In spite of the potential gains brought by activating D2D communications, the problem of severe interference between cellular and D2D users cannot be ignored. In this paper, we introduce the power-control scheme based on interference limited area (ILA) for alleviating...
This paper studies pilot reuse and data transmit power control in a D2D underlay massive MIMO system over fading channels. In order to reduce the length of pilots, we propose to reuse a set of orthogonal pilots among DUEs, and the graph coloring based pilot allocation (GCPA) algorithm is utilized to allocate pilots to DUEs. Linear minimum mean square error (LMMSE) filters are used for signal detection...
This paper investigates the power control problem for the downlink of a non-orthogonal multiple access (NOMA) system with two cells. The problem, called p-Opt, aims to minimizes the total transmit power of the base stations subject to the data rate requirements of the users. The feasibility and optimality properties of p-Opt is first characterized. It is proved that the feasible power region of p-Opt...
In Dual Connectivity (DC), a User Equipment (UE) can be configured with two radio access nodes in order to aggregate the available resources at both nodes. As with dual connectivity each node has independent radio resource manage- ment, the maximum power allocation at the UE can be easily exceeded and the interference can be increased. Hence, the power distribution among the carriers needs to be optimized...
Device-to-Device communication (D2D) has been a hot research topic in recent years, especially concerning the integration of D2D and conventional cellular networks. In general, the integration improves the efficiency and flexibility of the overall system. Furthermore, D2D can provide partial solutions for some inherent problems of cellular systems, such as cell edge related problems. Currently, most...
This paper investigates the power control problem for the uplink of a non-orthogonal multiple access (NOMA) system with two cells. The game-theoretic approach is used to study the stability of distributed power control algorithms. It is shown that a unique Nash equilibrium exists if the Perron- Frobenius eigenvalue of a certain link gain matrix is less than one. A distributed power control algorithm...
In massive multiple-input multiple-output (MIMO) system with time-shifted pilots, the interference from other cell groups, where the pilots are staggered with the ones in the target cell group, can be eliminated when the number of antennas at base station (BS) is infinite. However, with only hundreds of antennas at the BS in practice, both intra-group interference and inter-group interference can...
In this paper, we consider the problem of maximizing the sum energy efficiency (EE) for LTE networks where the interferences occur between cells. Cell load, transmit rate and transmit power, where cell load demonstrates the average resource usage in a cell, are considered in the signal-to- interferenceand-noise-ratio (SINR) model. Exploiting the properties of sum EE, we prove that operating at full...
Neighbour discovery is an important process in device-to-device (D2D) communications. In cellular networks, D2D discovery signals are multiplexed with cellular signals causing in-band emission interference (IEI). IEI degrades D2D user equipments (DUEs) discovery range and cellular user equipments (CUEs) throughput. In this paper, a new discovery method is proposed by applying power control strategy...
We consider in this paper the physical layer security of multi-pair communication in massive MIMO aided amplify-and-forward (AF) relaying, where an eavesdropper (Eve) may intercept the information intended to any of the destinations. We derive closed-form deterministic equivalents of the end-to-end signal to interference-plus-noise ratios of legitimate users and Eve. We assume that the AF processing...
We develop an interference-aware relaying scheme in hybrid wireless networks. The scheme is derived from the optimization model which generalizes the multi-hop package delivery problem in hybrid wireless networks. It aims at minimizing the network costs via optimal power loading and relaying route. Besides, the new cost model considering interference impact is an advance on the basis of our previous...
Three-node full-duplex is a promising new transmission mode between a full-duplex capable wireless node and two other wireless nodes that use half-duplex transmission and reception respectively. Although three-node full-duplex transmissions can increase the spectral efficiency without requiring full-duplex capability of user devices, inter-node interference - in addition to the inherent self-interference...
The ubiquity of WLAN networks bears inherently a risk of generating considerable interference level. Measurements have been obtained to demonstrate that densely, though randomly deployed Access Points cannot operate at maximum bit rates due to mutual interference. A simple non-collaborating algorithm has been proposed and verified under carefully controlled measurement conditions providing a proof...
Distributed resource allocation is considered as a significant feature of future self-organizing wireless networks. On the other hand, full-duplex transmission is an emerging technology which can theoretically double the data rate. and hence enhance the performance of wireless networks significantly. In this work, we address the problem of distributed power control in a two-tier network with full-duplex...
In this paper, we study the codebook-based resource allocation problem for an uplink sparse code multiple access (SCMA) network. The base station (BS) assigns to each user a set of subcarriers corresponding to a specific codebook, and each user performs power control over multiple subcarriers. We aim to optimize the subcarrier assignment and power allocation to maximize the total sum-rate. To solve...
In this paper, we investigate the physical layer security issue in Device-to-Device (D2D) communications underlaying cellular networks. In order to optimize the system secrecy rate of the cellular secure communication, we derive the optimal joint power control solutions of both the cellular communication links and D2D pairs in terms of the secrecy capacity. Furthermore, we propose a secrecy-based...
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