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In this paper, a novel mobile WiMAX location and positioning scheme utilizing WiMAX preamble has been proposed. The purpose of the scheme is to enhance the accuracy of location estimation in WiMAX services. Preamble detection for 10MHz and 20MHz FFT bandwidth under ITU-R channel models (Vehicular (A) and Pedestrian (B)) has been evaluated and analysed. Simulation results show that the 20MHz FFT outperformed...
In this study, a planar 4×4 phased array including modified E-shaped radiation elements is designed and fabricated to be incorporated in a Relay Station (RS) for realizing the communication with the super-ordinate Base Station. The proposed array provides 12.4% bandwidth at the 3.5GHz frequency band and gain of 21.2dB. Moreover a beamforming module is designed and simulated, aimed to be connected...
In this work, a novel coplanar waveguide (CPW) fed rectangular patch antenna embedded with four L-shaped slots for WiMAX application was proposed. This antenna is designed by using an FR4 epoxy board with dielectric constant, εr = 4.4, tangent loss, tan δ = 0.019 and the thickness of substrate, h = 1.6mm. There are two methods applied in this antenna to improve the characteristic of the antenna. The...
WiMAX is a radio technology for transmitting data at high speed. The challenge for these networks is to ensure the Quality of Service (QoS) for different types of applications having different characteristics and requirements. Among these applications we note the telemedicine; where communication and information technology is used to help improving human life especially in regard to health. Medical...
This paper deals with a triple frequencies monopole antenna design. The antenna is composed of three radiating elements, and fed by a microstrip line. Resonant frequencies of these elements are covered 2.4 GHz, 3.5 GHz, and 5.5 GHz, which are suited for both WLAN and WiMAX bands requirement. To reach this goal, a T-type resonator is adopted for one element, which emits 2.4 GHz, the other is with rectangular...
A micro-grid is a small scale power supply network that is designed to provide electricity to a small community with its own renewable energy sources. Due to distributed generation variability, security and load sharing issues, an efficient communication infrastructure is necessary between its agents (load, generation and storage units). Numerous research efforts are being developed to come up with...
The integration of EPON and WiMAX access networks has demonstrated considerable promise as an access solution applicable to the architecture of Fixed Mobile Convergence (FMC). The complementary features of these two systems provide high bandwidth and mobility, while reducing network deployment costs. Despite the fact that many network hardware architectures have been proposed for integrated EPON/WiMAX...
WiMAX delivers Quality of Service (QoS) to users based on a pre-determined traffic classification model. We develop an auction framework to bid for allocating the resources based on the utilities and traffic demands. We classify the users into two categories Premium User who has a high priority access and Non premium user having low-priority access. In principle larger the bandwidth more resources...
4G wireless communication expects to integrate different radio access technologies together to meet wide expectation from users and to support mobility. Call Admission Control (CAC) plays important role in such heterogeneous environment to effectively utilize network resources and to meet user QoS. This paper proposes IP Multimedia Subsystem (IMS) based integrated architecture for UMTS-WiMAX-WLAN...
A stacked square microstrip antenna combined with a ring stacked microstrip antenna is proposed for triple band operation. The two antennas are excited by an L-probe feed. Antenna characteristics (VSWR and radiation pattern) and operational principle are clarified by simulation. Moreover, the antenna is designed for Wimax (2.5GHz/3.5GHz/5.8GHz)
In this paper, we propose a new Ultra Wide-Band (UWB) antenna with ground-slot. This antenna is designed to have a band notch that separate between the Worldwide Interoperability for Microwave Access (WiMAX) applications based on the IEEE 802.16 standards for the frequency band 3.3–3.8 GHz and the X-band uplink and downlink frequencies 7.25–7.75 GHz and 7.9–8.4 GHz respectively, beside this frequency...
This paper displays a new compact monopole antenna of dual band for WLAN/WiMAX applications. The designed antenna has very small size of 30×20 square millimeter. U-shaped patch printed on FR-4 substrate. Adding two parasitic elements on the ground plane which give a good performance at the two operating frequencies 2.4 GHz and 3.5 GHz. The return loss is −21.71 dB at the operating frequency 2.4 GHz...
Pilot protection schemes, extensively used in high voltage transmission grids, are one of the most effective methods of protecting networked distribution lines that use high speed inter-relay communications for fast fault detection and isolation. This paper examines the use of an IEEE 802.16/WiMAX based wide area smart grid communications network to support such schemes in the smart grid. The IEC...
Green communications has received much attention recently. For cellular networks, the base stations (BSs) account for more than 50 percent of the energy consumption of the networks. Therefore, reducing the power consumption of BSs is crucial to enhance the energy efficiency of cellular networks. Meanwhile, the mobile data traffic is expected to increase exponentially. To accommodate the increasing...
The contention based bandwidth request mechanisms are gaining much interest due to dynamic assignment of bandwidth to mobile stations (MS). The contribution made in this paper is twofold. First contention based bandwidth request is investigated for worldwide interoperability for microwave access (WiMAX) and long-term evolution networks (LTE) networks under various mobility conditions. It is found...
In a heterogeneous network consisting of diverse wireless access standards, vertical handoff (VHO) plays a major role in handling seamless data transfer. Vertical Handoff decision is based upon Received Signal Strength (RSS) measurements, where handoff (HO) decision is made individually without considering other HO user equipments (UE). This results in higher block rate and power consumption at the...
In this paper, we investigate the performance of contention bandwidth request (BR) mechanisms for WiMAX two-hop relay network under ITU-R vehicular pathloss model. The first hop and second hop corresponds to air interface from mobile station (MS) to relay station (RS) and from RS to base station (BS), respectively. To overcome fixed bandwidth allocation at RS, the proposed system carries out contention...
Quality of Service (QoS) differentiation measurement provides the ability to evaluate different level of QoS support in 4G networks such as Long Term Evolution (LTE) and Worldwide Interoperability for Microwave Access (WiMAX). Many research studies around the world have addressed the QoS Differentiation (QoS-Diff) considerations, however, to the best of our knowledge, only a few have attempted to...
Recently, mobile traffic (especially video traffic) explosion becomes a serious concern for mobile network operators. While video streaming services become crucial for mobile users, their traffic may often exceed the bandwidth capacity of cellular networks. To address the video traffic problem, we consider a future Internet architecture: Named Data Networking (NDN). In this paper, we design and implement...
In next generation wireless networks like WiMAX, a dynamic Call Admission Control (CAC) plays an important role to ensure Quality of Service (QoS) of existing users and to efficiently utilize network resources. We propose a predictive CAC namely Wireless Fair Intelligent Admission Control (WFIAC) that admits or rejects a new incoming connection base on resource availability and load in the network...
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