Performance evaluation of wireless IEEE 802.11(b) used for ad-hoc networks in an e-learning classroom network

Evaluation of wireless networks for performance evaluation is a popular research area and a wealth of literature exists in this area. Wireless networks in infrastructure mode as well as Ad-hoc networks such as MANETs are considered extensively. Simulation results are provided for E-learning scenarios for cases where wireless networks in infrastructure mode are employed, however the possibilities of using ad- hoc networks and performance evaluation of e-learning scenarios with ad hoc networks are not considered. This paper presents an evaluation of the performances for wireless Ad-hoc networks employed in typical e-learning environment by using the OPNET modeller. Numerical simulation results, discussions and comparisons are provided. The results can be of great help for optimisation studies in typical e-learning environments. The performance issues are considered together with scalability concerns

Performance and Comparative Analysis of Wired and Wireless Communication Systems using Local Area Network Based on IEEE 802.3 And IEEE 802.11

The aim of this research is to carryout Performance Analysis and Comparison of Wired and Wireless Communication Systems using Local Area Network (LAN) based on IEEE 802.3 and IEEE 802.11 standard, carried out with emphasis on Throughput, Delay, Bit error rate and Signal to Noise Ratio by collecting data at the Delta State University e – library network.. From the experimental results of the ten shots sample data for both wired and wireless networks, the wired network in its three transmission protocols (TCP, IPV4 & IPV6) has overall throughput average of 6085Kbps, while the wireless has overall throughput average of  2752Kbps. From the computed total average values, the wired network exhibited delays of 4ms, 45ms and 6ms in its (TCP, IPV4 & 6ms) respectively with overall average of 52 milliseconds (52ms). While on the other hand the wireless had delays of 36ms, 4ms & 52 ms in its (TCP, IPV4 & IPV6) respectively, with overall average of 57 milliseconds (57ms). In terms of Bit Error Rate, the wired network have bit error rate of 1.364E-03%, 7.773E-05% and 7.28E-06% in its (TCP, IPV4 and IPV6) respectively, with overall average of 4.83003E-04%. While the wireless network have the values of 8.-7E-05%, 0% and 7.61E-04% in its (TCP, IPV4 and IPV6) respectively, with overall average of 2.805667E-04%. With respect to Signal to Noise Ratio, the wired network have signal to noise ratio overall average of 8.266 dB. While the wireless network have the overall average of 5.178 dB. Based on the, networks performance metrics statistical data analyzed above for both wired and wireless, we are of the opinion that the wireless network is preferable to the wired network under the area investigated.Keywords: Performance, Communication systems, IEEE 802.11 and IEEE 802.3 Standard

Interoperability of wireless communication technologies in hybrid networks: Evaluation of end-to-end interoperability issues and quality of service requirements

This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.Hybrid Networks employing wireless communication technologies have nowadays brought closer the vision of communication “anywhere, any time with anyone”. Such communication technologies consist of various standards, protocols, architectures, characteristics, models, devices, modulation and coding techniques. All these different technologies naturally may share some common characteristics, but there are also many important differences. New advances in these technologies are emerging very rapidly, with the advent of new models, characteristics, protocols and architectures. This rapid evolution imposes many challenges and issues to be addressed, and of particular importance are the interoperability issues of the following wireless technologies: Wireless Fidelity (Wi-Fi) IEEE802.11, Worldwide Interoperability for Microwave Access (WiMAX) IEEE 802.16, Single Channel per Carrier (SCPC), Digital Video Broadcasting of Satellite (DVB-S/DVB-S2), and Digital Video Broadcasting Return Channel through Satellite (DVB-RCS). Due to the differences amongst wireless technologies, these technologies do not generally interoperate easily with each other because of various interoperability and Quality of Service (QoS) issues. The aim of this study is to assess and investigate end-to-end interoperability issues and QoS requirements, such as bandwidth, delays, jitter, latency, packet loss, throughput, TCP performance, UDP performance, unicast and multicast services and availability, on hybrid wireless communication networks (employing both satellite broadband and terrestrial wireless technologies). The thesis provides an introduction to wireless communication technologies followed by a review of previous research studies on Hybrid Networks (both satellite and terrestrial wireless technologies, particularly Wi-Fi, WiMAX, DVB-RCS, and SCPC). Previous studies have discussed Wi-Fi, WiMAX, DVB-RCS, SCPC and 3G technologies and their standards as well as their properties and characteristics, such as operating frequency, bandwidth, data rate, basic configuration, coverage, power, interference, social issues, security problems, physical and MAC layer design and development issues. Although some previous studies provide valuable contributions to this area of research, they are limited to link layer characteristics, TCP performance, delay, bandwidth, capacity, data rate, and throughput. None of the studies cover all aspects of end-to-end interoperability issues and QoS requirements; such as bandwidth, delay, jitter, latency, packet loss, link performance, TCP and UDP performance, unicast and multicast performance, at end-to-end level, on Hybrid wireless networks. Interoperability issues are discussed in detail and a comparison of the different technologies and protocols was done using appropriate testing tools, assessing various performance measures including: bandwidth, delay, jitter, latency, packet loss, throughput and availability testing. The standards, protocol suite/ models and architectures for Wi-Fi, WiMAX, DVB-RCS, SCPC, alongside with different platforms and applications, are discussed and compared. Using a robust approach, which includes a new testing methodology and a generic test plan, the testing was conducted using various realistic test scenarios on real networks, comprising variable numbers and types of nodes. The data, traces, packets, and files were captured from various live scenarios and sites. The test results were analysed in order to measure and compare the characteristics of wireless technologies, devices, protocols and applications. The motivation of this research is to study all the end-to-end interoperability issues and Quality of Service requirements for rapidly growing Hybrid Networks in a comprehensive and systematic way. The significance of this research is that it is based on a comprehensive and systematic investigation of issues and facts, instead of hypothetical ideas/scenarios or simulations, which informed the design of a test methodology for empirical data gathering by real network testing, suitable for the measurement of hybrid network single-link or end-to-end issues using proven test tools. This systematic investigation of the issues encompasses an extensive series of tests measuring delay, jitter, packet loss, bandwidth, throughput, availability, performance of audio and video session, multicast and unicast performance, and stress testing. This testing covers most common test scenarios in hybrid networks and gives recommendations in achieving good end-to-end interoperability and QoS in hybrid networks. Contributions of study include the identification of gaps in the research, a description of interoperability issues, a comparison of most common test tools, the development of a generic test plan, a new testing process and methodology, analysis and network design recommendations for end-to-end interoperability issues and QoS requirements. This covers the complete cycle of this research. It is found that UDP is more suitable for hybrid wireless network as compared to TCP, particularly for the demanding applications considered, since TCP presents significant problems for multimedia and live traffic which requires strict QoS requirements on delay, jitter, packet loss and bandwidth. The main bottleneck for satellite communication is the delay of approximately 600 to 680 ms due to the long distance factor (and the finite speed of light) when communicating over geostationary satellites. The delay and packet loss can be controlled using various methods, such as traffic classification, traffic prioritization, congestion control, buffer management, using delay compensator, protocol compensator, developing automatic request technique, flow scheduling, and bandwidth allocation

Analisa Performansi WLAN Menggunakan Opnet

Pemanfaatan jaringan WLAN untuk proses belajar mengajar di kelas sudah banyak dilakukan. Jaringan ini banyak dipakai karena mudah dan sederhana dalam implementasi, biaya relatif lebih murah dibandingkan dengan jaringan kabel, mendukung mobilitas user, serta adanya standard yang telah didefinisikan dengan baik. Meskipun demikian, performansi WLAN tidak dapat diprediksi dengan tepat, karena sangat tergantung dengan kondisi lingkungan pada saat digunakan. Kondisi lingkungan dapat berupa lokasi dan banyaknya client yang terhubung dalam satu layanan access point (AP), kondisi ruangan, serta keberadaaan perangkat elektronik lain yang menggunakan frekuensi ISM. Dalam penelitian ini, performansi WLAN dievaluasi berdasarkan parameter data rate, jenis stasiun yang digunakan (standar 802.11b dan 802.11g), serta batasan fragmentasi frame. Evaluasi performansi WLAN dilakukan melalui simulasi menggunakan opnet MODELER academic edition. Hasil simulasi menunjukkan bahwa dalam jaringan WLAN802.11, besarnya data rate sangat berpengaruh terhadap kinerja jaringan. Begitu juga dengan stasiun standar 802.11b, meskipun tetap bisa dilayani tetapi keberadaannya menyebabkan penurunan kinerja yang sangat signifikan. Dari 12 stasiun mobile yang ada dalam WLAN, dengan hanya 2 stasiun bertipe 802.11b telah menyebabkan penurunan kinerja sebesar 63% dalam pencapaian throughput. Mekanisme fragmentasi dapat digunakan sebagai alternatif untuk meningkatkan kinerja WLAN. Dari hasil simulasi, pemakaian mekanisme fragmentasi berhasil meningkatkan kinerja sebesar 38% sampai 50%

Role of Wireless technology in mobile augmented reality system (MARS)

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