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Channel state information (CSI) has been recently shown to be useful in performing security attacks in public WiFi environments. By analyzing how CSI is affected by the finger motions, CSI-based attacks can effectively reconstruct text-based passwords and locking patterns. This paper presents WiGuard, a novel system to protect sensitive on-screen gestures in a public place. Our approach carefully...
Long Term Evolution (LTE) carrier aggregation with 5GHz unlicensed national informational infrastructure (UNII) band has been suggested by the industry as a good solution to handle the rapidly increasing amount of data traffic. To provide fair coexistence of LTE-licensed assisted access (LTE-LAA) and Wi-Fi on 5 GHz, several coexistence mechanisms have already been proposed. Nevertheless, as one of...
By decoupling the control plane from the data plane and providing programmability for network applications, software-defined network (SDN) is positioned to offer more efficient management, higher flexibility and better performance. Routing and resource allocation are two closely related applications in wireless networks. With close cooperation, better performance and lower complexity can be achieved...
In Cognitive Neuroscience, the sustained attention under disturbance condition has been a hot research topic. We not only study the basic mechanism of sustained attention, but also study how the disturbance affects the nervous system of sustained attention.
LTE License-Assisted Access (LTE-LAA) in unlicensed spectrum has drawn a lot of attention due to its appealing data traffic offloading potential. However, the coexistence of LTE and WiFi technologies in the same unlicensed bands needs careful design to avoid severe interference between them. In this paper, we propose a coexistence scheme to create opportunities for LTE-LAA small cells and WiFi devices...
In recent years, the explosion of data traffic usage in wireless industry has resulted in a trend of hyper-dense small cells. With the large scale deployment of small cells, the rising cost of energy has attracted lots of interests. In this paper, we present a novel activation and sleep mechanism for small cells to decrease the energy consumption in heterogeneous networks (HetNets). The main idea...
The Reduced Power Subframes (RPS) are encouraged to be applied in the LTE-Advanced Heterogeneous Networks (HetNets), to reduce the capacity loss caused by the Almost Blank Subframes (ABS). However, the RPS are supposed to be used in the macrocells only. In fact, the RPS can also be used in femtocells to mitigate the interference that the macrocell edge users suffers, but its performance is not investigated...
Channel-width adaptation can significantly improve the connectivity, capacity and reduce the power consumption in wireless networks. The OFDMA-based channel-width adaptation based on traffic demand has been studied in wireless networks with sufficient spectral resources. However, the traffic demand may not be fully satisfied in resource-limited scenarios. In this paper, we study the channel-width...
In this paper the transceiver beamforming design problem for multipair two-way distributed relay networks is studied, where each multi-antenna user in one user group communicate with its partner in the other user group via distributed single-antenna relay nodes. To achieve a satisfactory performance while relieving relay nodes of the usual computation task, two iteration-based transceiver beamforming...
MAC interference in IEEE 802.11 network is caused by overlapped signal ranges and complex carrier sensing topology. Data throughput and wireless coverage increases by sender's transmission power in free space and this property identified the transmission power as a standard indication for wireless efficiency; however, increased transmission power also implies longer reachable signal range and higher...
The most promising approach to enhance network capacity for the next generation of wireless cellular networks (5G) is densification, which benefits from the extensive spatial reuse of the spectrum and the reduced distance between transmitters and receivers. In this paper, we examine the performance of different schedulers in ultra dense small cell deployments. Due to the stronger line of sight (LOS)...
In a heterogeneous wireless network consisting of macrocells and femtocells, it is important for mobile terminals to decide appropriate cell associations when both radio access technologies (RATs) are available. This problem is also known as network selection. Nowadays mobile users are distinct in terms of quality of service (QoS) demand, moving speed and other service preferences, while the conventional...
In this paper we propose an optimal resource management scheme for device-to-device (D2D) communications utilising uplink resources in a Single Carrier Frequency Division Multiple Access (SC-FDMA) system, which is the uplink access scheme in the 3GPP-Long Term Evolution (LTE) standard. We consider an arbitrary number of conventional cellular (CC) User Equipments (UEs) and D2D UEs, both utilising the...
In this paper, we study the cognitive interference management (CIM) scheme in the coexistence networks of macro-cells and femtocells. A single-channel detection based spectrum allocation algorithm is proposed to enhance the performance of femtocells considering the cross-tier interference and co-tier interference. The proposed scheme converts the complex interference environment into several specific...
Small cells are becoming essential to offer a promising solution for dramatic mobile traffic growth in future mobile networks. Especially, massive enterprise femtocells are expected to provide high capacity to fulfill high data demands in buildings in order to offload indoor traffic from outdoor macro cells in that over 80% of mobile data traffic is generated indoors. However, as one of the major...
We proposed a resource scheduling algorithm based on maximum throughput in Orthogonal Frequency-Division Multiple Access (OFDMA) based Long-Term Evolution (LTE) networks. The performance of the proposed algorithm is evaluated and compared with conventional maximum carrier-to-interference (C/I or MCI) based scheduling. From the systemlevel simulation, it is noted that maximum throughput based scheduling...
In this paper, we consider the resource allocation problem in the uplink transmission of an orthogonal frequency-division multiple access (OFDMA) based cognitive radio (CR) network. The resource allocation aims to maximize the uplink throughput of secondary users (SUs) in CR network under the constraints of the primary user (PU) interference and the transmit power limits of SUs. In general, the optimal...
Cooperative Multiple Point (CoMP) transmission aided Distributed Antenna Systems (DAS) are proposed for increasing the received Signal-to-Interference-plus-Noise-Ratio (SINR) in the cell-edge area of a cellular system employing Fractional Frequency Reuse (FFR) in the presence of realistic imperfect Channel State Information (CSI) as well as synchronisation errors between the transmitters and the receivers...
The aim of this paper is to present an interference impact assessment in the context of Global Navigation Satellite systems (GNSS), focusing on the new modulation based on the Multiple Binary Offset Carrier (MBOC) scheme that will be used for Galileo E1 civil signal. Simulation results are presented and discussed in order to perform the analysis of Galileo E1 civil signal in presence of Continuous...
In this paper, the issue of multi-user radio resource scheduling on the downlink of a Long Term Evolution (LTE) cellular communication system is addressed. An optimization model has been proposed earlier, where radio resources for multiple users are jointly allocated at the air-interface. It has been shown that an optimal solution to such a problem may provide reasonable gain over a simply greedy...
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