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Worldwide interoperability for microwave access (WiMAX) is one of the wireless communication technologies adopted for communication in smart grids. Due to the inherent differences between smart grid and mobile broadband applications, it is important to adjust planning and deployment of wireless technologies, including WiMAX. To this end, WiMAX is being amended to feature a smart grid system profile...
The problem of managing the scarce radio spectrum resource is addressed in this paper; based upon the Worldwide Interoperability for Microwave Access (WiMAX) network. Emerging and innovative techniques such as spectrum virtualization and network federation are adopted to enable the sharing of spectrum amongst mobile operators. A novel entity known as the Virtual Spectrum Hypervisor (VS-Hypervisor)...
Bandwidth enhancement of a rectangular monopole UWB antenna using M-shaped strip with triple band notched characteristic is presented. Antenna consists of an exciting rectangular patch with two C-shaped and one inverted U-shaped slots along with defected ground plane which is coupled with M shaped strip. By inserting slots to the rectangular patch, three notched frequency bands are achieved. A conceptual...
A heterogeneous system is based on an integration of different types of networks. In this paper, a system based on LTE and WIMAX for the Virtual University of Senegal is presented. It aims to study and optimize the system performance considering the Signal to Interference plus Noise Ratio (SINR), the blocking probability, user communications, and mobility loss. A Markov chain was used to assess and...
In this paper, a Coplanar Wave Guide (CPW)-Fed microstrip octagonal patch antenna for WLAN and WIMAX Applications is proposed. The studied structure is suitable for 2.3/2.5/3.3/3.5/5/5.5GHz WiMAX and for 3.6/2.4–2.5/4.9–5.9GHz WLAN applications. The octagonal shape is obtained by making a cut in the four angles of the rectangular microstrip patch antenna; in addition the using of CPW-Fed allows obtaining...
This paper presents a triple-band printed-circuit-board microwave absorber for applications in 2.4GHz WLAN and 3.5/5.8GHz WiMAX bands. The absorber consists of simple geometries with tuning elements and chamfering, which can significantly reduce the modeling errors. The study and design processes are based on numerical simulations. The simulated results show the absorption bandwidths (at 50%) of 160MHz...
Demand for broadband wireless access is rising as the need for user mobility and data access at all times increases. WiMAX also called IEEE 802.16 provides various Quality of Service (QoS) support at medium access control (MAC) layer to various classes of traffics such as audio, video, images and text. Scheduling plays an important role in providing QoS. IEEE 802.16 standard has not specified a standard...
In this paper, a slotted rook shaped novel wide band microstrip patch antenna suitable to be employed for C-Band satellite downlink, Radio Altimeter, IMT, WiMAX applications has been proposed. The proposed antenna is resonant at 4.3 GHz with an impedance bandwidth of 1.419 GHz (3.181 GHz to 4.6 GHz) and a return loss of −53.94dB. The Teflon is used as substrate for designing the proposed antenna having...
Unlimited voice services no longer command premium pricing, but are viewed as “table stakes” in a broader service offering that must now include multimedia (voice, data, video) communications with a mobility component. As a result of this shift, many service providers are trying to adopt, Long Term Evolution (LTE) network strategy to deliver this multimedia experience to their subscribers [1]. Today,...
Ultra Wideband (UWB) is a new emerging and promising technology as it can accommodate higher data over a large bandwidth. we proposed a compact printed monopole UWB antenna with 3.4GHZ band-notched Characteristics. A simple square patch antenna has been fed through a 50 Ω microstrip feedline and a rectangular notch has been etched on the ground plane to reject the interference of WIMAX Band (3GHZ–4...
In this paper, a reconfigurable triple notched-band UWB (Ultra Wide Band) antenna is presented. This compact antenna covers the frequency range from 3.1 GHz to 11.21 GHz. In order to reject a three frequency bands including the WiMAX (3.2–3.6 GHz), WLAN (5.15–5.85 GHz) and X band (7.25–8.395 GHz), we have inserted three different slots in the radiating patch; two C-shaped slots and a rectangular slot...
In the present day wireless communication networks, the main objective is to support different multimedia services with various requirements of Quality of Services and varying bandwidth requirements. The key role in effective resource management of WiMAX network is to enhance the performance of network. Gateway (GW) relocation of Access Service Network (ASN) includes changing the Anchor Point (AP)...
This paper presents a design for 1–6 GHz low noise amplifier (LNA) based on cascade GaN HEMTs with LC ladder input matching and stabilizing output impedance. The designed LNA is simulated using Advanced Design Software (ADS) based on a commercial packaged transistor from Cree Inc. The LNA shows a maximum noise figure of 2.95 dB in the 1–6 GHz range with a gain of 14 dB. It also has a maximum S 11...
A Compact Wideband Monopole Antenna, designed for wireless applications has been investigated in this paper. The antenna consists of a Radiating Patch along with a Defected Ground Plane. The proposed antenna has been compared with a similar Radiating Patch without any Defected Ground Structure (DGS) and the results have been discussed with comparison plots. The proposed antenna covers a frequency...
A compact, tuning-fork, microstrip-fed monopole antenna and a classical triangular patch antenna operating at 5.5 GHz for WiMAX and 5.2/5.8 GHz for WLAN and ISM are presented. The antenna fork features an arm with a slit, which improves the gain by 12% compared with fork antenna without slit. The antenna offers 1 GHz, 2:1 VSWR bandwidth. The proposed antenna has a compact size of 21 mm × 13 mm, resulting...
Connection Admission Control (CAC) is one of the resource allocation functions which plays a significant role to ensure Quality of Service (QoS) provisioning in wireless networks. To meet connection requirements, and achieve bandwidth efficiency with less computation complexity, we present a CAC mechanism for OFDMA-based WiMAX networks which uses fuzzy sets and fuzzy logic theory to admit new incoming...
This article analyzes security vulnerabilities in bandwidth allocation and request mechanisms that are specified in the IEEE 802.16 Standard, and introduces a bandwidth request adversary model called UL-BRA based on these vulnerabilities. The goal of UL-BRA is to abuse the bandwidth request/grant operation of a WiMAX network, resulting in a significant decrease of the overall uplink transmission performance...
A small dual band antenna is presented to be inserted in a wireless communication device. The proposed antenna consists of L-shaped and mirror L-shaped stubs that are designed for wireless local area network (WLAN) bands at (5.15–5.8GHz) and worldwide interoperability of microwave access (WiMAX) bands at (3.3–3.7GHz) using a defected ground structure. The patch of the antenna is printed on an FR-4...
In this paper, we propose a vertical handover decision algorithm. This algorithm executes the vertical handover based on several network criteria like the network delay, the available bandwidth, the received signal strength, etc. Fuzzy logic system was used to implement the handover initiation module while utility function was chosen for the network selection module. We compare our proposed algorithm...
In this paper a small size wideband planar inverted-F antenna (PIFA) is proposed which operates at 4G LTE (2.3–2.4 GHz) and (2.5–2.7 GHz), Bluetooth/WLAN (2.4–2485 GHz) and WiMAX (3.4–3.6 GHz) range. The proposed antenna has many advantages like small size and wide operation bandwidth. The antenna portion has dimensions as 20mm * 18mm and the overall dimensions are 44mm * 25mm * 0.8mm which can be...
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