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In this paper, we study the energy-efficient resource allocation in software-defined mobile networks with mobile edge computing and caching. With the introduction of caching and computing functions in mobile networks, content sources need to be selected according to the distribution of contents in caches, the capability of computational resources and the status of networks. Moreover, the network needs...
This demonstration presents a practical real-time full-duplex wireless link consisting of two full-duplex transceivers. Our prototyped full-duplex transceiver contains a custom-designed RF self-interference canceller and a National Instruments (NI) Universal Software Radio Peripheral (USRP). The discrete-component-based RF self-interference canceller emulates a compact RFIC implementation, which uses...
We propose a wireless virtualization framework based on the Stackelberg game model for resource allocation in downlink orthogonal frequency division multiple access (OFDMA) wireless networks. Specifically, the wireless virtualization model enables an infrastructure provider (InP) to effectively lease radio resources to multiple mobile virtual network operators (MVNOs) through adaptively setting resource...
Large absolute channel bandwidths at millimeter wave (mmWave) frequencies and more directional antenna gains may lead to quasi-deterministic (less random) channel fading behavior. Randomness in the cross polarization discrimination (XPD) is an attribute related to the channel fading behavior. In narrow-band channels, it is usually modeled as a log-normal random variable. From channel modeling perspectives,...
Typically, in low-power and lossy networks nodes communicate with servers over the Internet. Nodes collaborate wirelessly to relay their data to a gateway. A large-scale network can have multiple gateways. Selecting a proper gateway can have an immense impact on the network's performance. In this paper, we present joint routing and gateway selection protocols for low-power and lossy networks. To analyse...
Narrowband Internet of Things (NB-IoT) is a recently standardized technology to support machine-type communications (MTC) in Long Term Evolution-Advanced (LTE-A) Pro networks. NB-IoT can enable energy-efficient communication with extended coverage on a narrow bandwidth of 180 kHz for low-cost MTC devices (MTCDs). The main challenge of supporting MTC in LTE-A Pro networks is to provide connectivity...
Software-defined networking and mobile edge caching are promising technologies in next generation mobile networks. This paper proposes to jointly optimize bandwidth provisioning and caching strategies in software-defined mobile networks considering the quality of services and limitations of resources. The proposed scheme aims at maximizing gains from dynamically managing caches and efficiently utilizing...
Relay selection is a simple yet effective means to improve the reliability and coverage of wireless cooperative networks. However, it suffers from inefficient use of the available bandwidth resources. This paper introduces the use of content caching at relays in order to tackle this problem and improve the performance of relay selection. Three cache placement schemes are considered: one based on the...
In this paper, a very wide bandwidth frequency tripler and fourth harmonic mixer for a wireless communication link at 300 GHz have been designed. An anti-parallel configuraticn of Schottky diodes has been used for both devices. The fourth harmonic mixing configuration is a good solution when it is difficult to have enough Local Oscillator (LO) power to pump the diodes whereas frequency increases....
Among the mobile applications contributing to the surging Internet traffic, video applications are some of the biggest contributors. Most of these video applications use HTTP/HTTPS tunneling making it difficult to apply port based or packet data based identification of flows. This makes it challenging for network operators to enforce bandwidth regulation policies for app based service differentiation...
Community networks (CNs) have gained momentum in the last few years with the increasing number of spontaneously deployed WiFi hotspots and home networks. These networks, owned and managed by volunteers, offer various services to their members and to the public. To reduce the complexity of service deployment, community micro-clouds have recently emerged as a promising enabler for the delivery of cloud...
In this paper, we study the joint computation offloading and resource allocation problem exploiting computing resources from both mobile edge cloud and mobile peers. Our design aims to optimize the computation load assignments to local processors in the mobile users, mobile peers and the edge cloud jointly with the resource allocation to achieve the minimum weighted energy consumption subject to practical...
In in this paper, we present a proof-of-concept of a real-time 10GbE standard data connectivity and ultra-highdefinition (UHD) video streaming over a seamlessly converged intermediate frequency (IF)-over fiber (IFoF) and millimeter-Wave (mmWave) links. We successfully transmit π/4-DQPSK mapped Ethernet frames at 4.6 Gbps capacity over 2×20-km single mode fiber (SMF) links and 20-m W-band (i.e. 96-GHz)...
The ultimate goal of the Internet of Things (IoT) paradigm is to provide seamless connectivity of low power wireless devices to the Internet Protocol network. Cooperative Beamforming (CB) has been proposed as a technique that can enable low power wireless communication by allowing a collection of devices to transmit data simultaneously to a network aggregator in one hop. Apart from traditional CB...
This paper presents a millimeter-wave (mmWave) wideband sliding correlator channel sounder with flexibility to operate at various transmission rates. The channel sounder can transmit and receive up to 1 GHz of RF null-to-null bandwidth while measuring a 2 nanosecond multipath time resolution. The system architecture takes advantage of field-programmable gate arrays (FPGAs), high-speed digital-to-analog...
Seamless redundancy is an effective way to increase communication quality over wireless channels, and provides a degree of reliability that meets the standards demanded by many distributed control applications in industrial plants. Unfortunately, wireless spectrum usage increases consequently, which is often unacceptable as this is a shared and limited resource. Wi-Red is a proposal that applies seamless...
This paper focuses on the optimization of routing and interference-aware resource allocation for a wireless backhaul network, focusing on the end-to-end delay minimization. We adopt a convex optimization formulation, which allows the decomposition of the problem, separating the network-plane and the communications-plane, and also allows an easy interpretation of results. We integrate the solution...
This paper presents an improved communication architecture with increased data rate for inductive power transfer (IPT) systems. The main challenge is to enable robust and reliable communication within the noisy environment of the power transfer. Therefore, the communication channel, consisting of the coupled pair of coils of the inductive power transfer system is analysed. From this, a frequency band...
A systematic design of adaptive waveform for Wireless Power Transfer (WPT) has recently been proposed and shown through simulations to lead to significant performance benefits compared to traditional non-adaptive and heuristic waveforms. In this study, we design the first prototype of a closed-loop wireless power transfer system with adaptive waveform optimization based on Channel State Information...
In visible light communication (VLC) system, the Orthogonal Frequency Division Multiplexing (OFDM) technique has been widely used to achieve a high data rate transmission. However, OFDM will cause high peak-to-average power ratio (PAPR) in the VLC system. In this paper, we propose and experimentally demonstrate a new interleaved Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing...
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