المقالات العلمية - كلية الهندسة

Permanent URI for this collectionhttps://repository.neelain.edu.sd/handle/123456789/10362

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Start date: 2010

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    Performance Evaluation of Voice and video conferencing For WIMAX Network under Various Modulation techniques
    (2016-08) Almutaz Ali Mohammed, Ibrahim Elimam Abdalla
    Worldwide interoperability for Microwave Access (WIMAX) that based on 802.16d/e Orthogonal Frequency Division Multiplexing (OFDM) and based on adaptive Physical Layer (PHY), It provides wireless broadband to fixed and mobile terminals, The basic WIMAX feature is wireless transmission infrastructure which allows a fast use as well as low maintenance costs, Modulation techniques enable WIMAX network to be optimized. WIMAX supports BPSK, 16-QAM, DPSK, and 64-QAM as a modulation technique. This paper present evaluation of various modulation techniques and study of performance for voice and video conferencing applications, An Opnet software used to simulate WIMAX Modulation techniques impact on voice and video conferencing, The simulation results includes the performance analysis for bit error rate (BER), SNR, MOS, MOS loss Rate, end to end packet delay and Jitter of different modulation
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    Performance Analysis of FTP, HTTP and Database for IEEE802.11, IEEE802.11a, IEEE802.11b and IEEE802.11g using OPNET Simulator
    (2016-08) Almutaz Ali Mohammed1, Ibrahim Elimam Abdalla
    Abstract: WLAN is the most exceedingly accepted broadband wireless technology that can offer a high transmission rate; Wi-Fi provides its users with option of connecting to the Internet from any place without wires. This paper presents a performance analysis of WLAN in a simulated office for different applications (FTP, Database and HTTP) for various WLAN standards(802.11b, 802.11a, 802.11g, 802.11 infrared and 802.11 frequency hopping), OPNET 14.5 tool was used to design the network that consists of a number of access points each of them supports different WLAN technology standards, deployed to serve the needs of workstations that work with same AP standard with maximum data rate adopted by this standard. From the simulation, we focused to find out some metrics namely Database, FTP and HTTP download - upload response times, WLAN load, WLAN delayed, WLAN throughput, Media access delay, TCP abort and queuing size.