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In a wireless body area networks (WBAN) with integrated sensor hubs, the proposed MAC protocol is a TDMA-based schedule used in active superframe interleaving and beacon shifting defined by the IEEE 802.15.6 standard. It considers the human dynamics and traffic information to meet the different QoS requirements of each sensor, improve bandwidth utilization and reduces packet collisions within networks...
For super-regenerative oscillators (SRO), a principal component that determines several aspects of the system response is the quench signal generation. The high oscillation frequency of mm-wave SROs enables fast quench rates that could well exceed 10 GHz. This is desirable because higher symbol rates and, consequently, higher communication data rates could be achieved. This work presents a limiting...
A novel mobility-aware and energy-efficient coded caching provisioning strategy, Mobee, is proposed for a Cloud Radio Access Network (C-RAN). The placement of the Maximum-Distance Separable (MDS) encoded content at the Base Stations (BSs) is optimized to minimize the total energy consumption of the network comprising the transport and the caching energy consumptions. To account for user mobility,...
A variety of wireless communication links today, such as HSPA+ access in high speed trains, balloon-based aerial wireless networks and satellite Internet connections have high loss rates. In such environments, Multipath TCP (MPTCP) offers a robust solution compared to regular TCP. However, MPTCP and existing schedulers suffer from performance degradation for both constant bit rate (CBR) and bulk traffic...
High fluctuation of signal strength is evident in wireless channel under mobile environment. IEEE 802.11n and IEEE 802.11ac based wireless technologies experience a challenge for selecting link configuration parameters, like number of spatial streams, channel bonding, advanced modulation and coding schemes, frame aggregation etc., dynamically under mobility. Selection of the best possible data rate...
A novel angular independent dual-band FSS for multi-frequency communication is discussed in this letter. The proposed FSS with closely spaced response is consist of improved cross-shaped metal strips and a dielectric substrate. The unit cell size of the proposed FSS is 0.13λ×0.13λ where λ corresponds to the wavelength of the first resonant frequency. The proposed FSS exhibits dual stop band characteristics...
Accessing the Internet through Wi-Fi networks offers an inexpensive alternative for offloading data from mobile broadband connections. Businesses such as fast food restaurants, coffee shops, hotels, and airports, provide complimentary Internet access to their customers through Wi-Fi networks. Clients can connect to the Wi-Fi hotspot using different wireless devices. However, network administrators...
Novel wireless systems are often first evaluated by simulation, before prototypes are tested and the concepts are standardized. In order to ensure relevant simulation results, the wireless channel has to be modelled properly and application oriented. Currently, only few considerable industrial channel models are available. The IEEE 802.15.4a model is the most commonly used. CM 7 applies for LOS modelling...
Terahertz (THz) band (0.1–10 THz) communication, which is envisioned as one of the key wireless communication technologies of the next decade, exhibits an extremely large bandwidth at the cost of an extremely high path loss. The unique distance-dependent behavior on the available bandwidth in THz communication interrelates all THz properties, and affects the design and performances within and across...
Wi-Fi enabled hand-held devices have quickly occupied the consumer market as a result of the remarkable customer acceptance of IEEE 802.11 standard. In this regard, the demand of high throughput introduces high throughput standards such as IEEE 802.11ac. It supports Dynamic Bandwidth Channel Access (DBCA), where a wireless station selects channel bandwidth dynamically based on the availability of...
Cognitive radio network (CRN) is regarded as an emerging technology for better spectrum efficiency where unlicensed secondary users (SUs) sense RF spectrum to find idle channels and access them opportunistically without causing any harmful interference to licensed primary users (PUs). However, RF spectrum sensing and sharing along with reconfigurable capabilities of SUs bring severe security vulnerabilities...
This paper proposes a reliable method of characterizing the scattering parameters of radio links operating at terahertz frequencies. The complex transfer characteristics and the non-idealities of analog transmit-receive frontends with quadrature baseband channels can be evaluated. Two coherent channels of an arbitrary waveform generator, combined with filters and a frequency multiplier chain are employed...
In this paper, wideband and ultra wideband (UWB) radio propagation within a small aircraft was measured and statistically analyzed. Wideband including UWB wireless technology has been considered for replacing wire harnesses used in aircrafts, spacecraft, and other closed-or semi-closed spaces because of its anti-multipath capabilities and possible low power consumption. Adaptation of wireless technologies...
Mobile Broadband (MBB) access networks are becoming more and more used worldwide, and the devices adopted to access them are increasing in number and complexity (smart-phones, mobile hotspots, vehicular infotainment systems). The highly dynamic nature of such scenarios calls for continuous monitoring and measurement of the network. To this aim, the Available Bandwidth is a performance metric of the...
Same frequency networking (SFN) technology is widely used in modern wireless network to achieve high area spectrum efficiency. However, it brings the inter-cell interference to the users at the cell edge. Frequency allocation and power control is extensively used to diminish the effect of the interference. Most of the researches are focus on the downlink data transmission due to the fact that the...
VANET and cognitive radio network (CRN) are both new emerging technologies in wireless networking. The application of CR concept in wireless communication systems for intelligent vehicles has been envisioned as a promising idea towards solving the problem of scarce spectrum. This paper discusses CR technologies for VANETs aimed at opportunistic spectrum access (OSA) for improved vehicular communication...
This paper investigates the use of ultra-wideband (UWB) radio for communication in industrial wireless sensor networks (WSNs). OpenWSN is an open-source IPv6 mesh network protocol stack based on IEEE 802.15.4 time slotted channel hopping (TSCH). We adapted OpenWSN to operate an UWB physical layer based on the DecaWave DW1000 UWB transceiver. Experiments were conducted in an industrial steam heating...
Multichip systems with memory stacks and various processing chips are at the heart of platform based designs such as servers and embedded systems. Full utilization of the benefits of these integrated multichip systems need a seamless, and scalable in-package interconnection framework. However, state-of-the-art inter-chip communication requires long wireline channels which increases energy consumption...
This paper proposes an experimental evaluation of the IEEE 802.11ac standard. The evaluation testbed is comprised of two National Instruments Universal Software Radio Peripheral (NI USRP) 2954R Software Defined Radios (SDRs) controlled by the NI-PXIe-8840 Quad-Core embedded computer running the 802.11 Application Framework and Lab VIEW Communications 2.0. Two evaluation scenarios are analyzed: (1)...
In this paper, the state of the art and progress towards building a complete plasmonic front-end for Terahertz communications is described. The discussed system architecture, whose components rely on the properties of graphene and III/V semiconductors, is able to generate, modulate, radiate and, reciprocally, detect and demodulate THz signals with multi-GHz bandwidths, needed for next generation communication...
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