WiMax: The Emergence of Wireless Broadband

Abichar, Zakhia; Peng, Yanlin; Chang, Jingbo

doi:10.1109/mitp.2006.99

Cited by 76 publications

(22 citation statements)

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“…This amendment allowed for operation at lower frequencies, 2-11 GHz, and the physical standard was extended to use orthogonal frequency division multiplex (OFDM) modulation, allowing increased throughput for the same radio bandwidth. IEEE 802.16d [19] was released in 2004, harmonizing some aspects of the 802.16 standard with the European HIPERMAN [20] and consolidating previous revisions. For the current generation of licensed ''last-mile'' broadband installations, this is the defacto standard.…”

Section: Wimax Technology Overviewmentioning

confidence: 99%

Secure data networks for electrical distribution applications

Laverty

O'Raw

et al. 2015

J. Mod. Power Syst. Clean Energy

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Smart Grids are characterized by the application of information communication technology (ICT) to solve electrical energy challenges. Electric power networks span large geographical areas, thus a necessary component of many Smart Grid applications is a wide area network (WAN). For the Smart Grid to be successful, utilities must be confident that the communications infrastructure is secure. This paper describes how a WAN can be deployed using WiMAX radio technology to provide high bandwidth communications to areas not commonly served by utility communications, such as generators embedded in the distribution network. A planning exercise is described, using Northern Ireland as a case study. The suitability of the technology for real-time applications is assessed using experimentally obtained latency data.

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Section: Wimax Technology Overviewmentioning

confidence: 99%

Secure data networks for electrical distribution applications

Laverty

O'Raw

et al. 2015

J. Mod. Power Syst. Clean Energy

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“…The reason is that link failures are followed by long periods of routing instability during which packets are dropped because of being forwarded along invalid paths. The study in [7] presents a simulation model and analyzes the performance of an IEEE 802.16 system by focusing on the MAC layer scheduling for VoIP traffic using AMR codecs. However, for IP networks, the aggregate background traffic affects the performance of VoIP.…”

Section: Literature Reviewmentioning

confidence: 99%

Enhanced Quality of Service in Worldwide Interoperability for Microwave Access Networks

mohammed¹

2014

IOSRJECE

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I. ObjectiveThe objective of study is to guarantee QoS for multiple service class traffic in a multiple connection environment and to examine a case of QoS deployment over a cellular WiMAX network. In particular, the paper compares the performance obtained using two different QoS configurations differing from the delivery service class ,to guarantee QoS for multiple service class traffic in a multiple connection environment in WiMAX network the Adaptive modulation and coding scheme is used at the physical layer that adapts to the scheduled traffic to stabilize the QoS requirements of different traffic classes, Configure QoS mechanisms to guarantee low delay for multimedia application without drastically affecting data traffic. We analyze the distribution impact on traffic arrival time to quality of VoIP in WiMAX network; analysis the quality of service (QoS) with VoIP over WiMAX will be performed. Performance of selected parameters will be done using the network simulator, OPNET Modeler Problem statementThe demand for multimedia applications in WiMAX networks is growing at a rapid pace. A method for guaranteeing Quality of Service (QoS) for different classes of traffic is therefore gaining importance. Hence designing and analyzing multimedia traffic and QoS parameters has become central to this problem. In this study, we ]have investigated the data and voice support in the WiMAX network and to examine the capability of a WiMAX network to deliver adequate QoS to voice and data applications. II. Research MethodologyIn our case, we have used OPNET Modeler and the study in presents a simulation model to analyzes the performance of an IEEE 802.16 system by focusing on the MAC layer scheduling and evaluate VoIP traffic by using G.729 ,G .711 and G .723 codecs. III. Literature ReviewThere has been quite a lot of research done in the past, involving models to Improve QoS Performance over WiMAX.Supporting real-time applications over any wireless network for example, 3G cellular networks, IEEE 802.11-based wireless LANs, and IEEE 802.16-based WIMax) poses many challenges, including limited bandwidth, coping with bandwidth fluctuations, and lost or corrupted data. Due to the growing popularity of streaming services over wireless networks, the problems have been well researched and many solutions have been proposed which combine audio and video processing techniques with mechanisms that are usually dealt with in the data link and physical layers. These approaches can broadly be classified into two categories: automatic repeat request (ARQ) and forward error correction (FEC). ARQ schemes provide high reliability when the channel is good or moderate. However, for error-prone channels, the throughput drops due to the

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“…The communication message contains the MSDUs and in some cases may contain bandwidth requests or retransmission requests. Automatic Repeat Request (ARQ) mechanism is also supported by WiMAX MAC which allows retransmission of MSDUs which achieves better reliability [8]. …”

Section: Mac Frame Structurementioning

confidence: 99%