Performance Analysis of IEEE802.11 Protocol For Different Values of Data Link Layer Parameters
Tez Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Erciyes Üniversitesi, Fen Bilimleri Enstitüsü, Bilgisayar Mühendisliği, Türkiye
Tez Danışmanı: Selçuk Ökdem
Tezin Onay Tarihi: 2020
Tezin Dili: İngilizce
Özet:
The IEEE 802.11 consists of several protocols and standards in data-link and physical layer, which are the first two layers of OSI reference model. Media access control layer is the lower layer of data-link layer in which has many parameters and variables that affects the wireless communication quality. This thesis aims to investigate how throughput, signal-to-noise ratio, packet error-rate values of a wireless communication vary according to various data-link layer parameters such as transmission power, distance, bit rate and maximum transfer unit size. And, it intends to find out values or value ranges of these parameters in which IEEE 802.11g wireless standard works most efficiently. The wireless transmission has a high error-rate due to its physical structure compared to the wired media. The signal-to-noise ratio, packet error-rate, and throughput are crucial values that give information about the quality of wireless communication. It has been observed that a good signal-to-noise ratio is obtained with low noise and high receiving power, and if the packet error-rate increases, the quality of wireless communication and throughput deteriorates, and slower data transfer rates are less sensitive to distance, and faster data transfer rates are more sensitive to distance in the studies conducted within the scope of the thesis. Path loss models are used to calculate how much of a transmitted signal power decreases as it moves away from the transmitter. Within the scope of the thesis, the two-ray ground reflection model was used as a path loss model in which two waves arrive at the receiver with direct propagation and ground reflection wave. The theoretical throughput has been calculated based on standards defined by IEEE 802.11 for IEEE 802.11b and IEEE 802.11g. More than three hundred experiments have been run on the Omnet++ and INET framework to observe practical throughput, signal-to-noise ratio, packet error-rate, and bit error-rate. The results and findings are illustrated in tables and graphs and interpreted.