Analysis of the Relationship between QoS and SNR for an 802.11g WLAN

Abstract

Nowadays, it is very important to study the behavior of the wireless networks due to the variety of applications that make use of this technology. These applications frequently require a minimum QoS in order to work properly and guarantee a good service to the user. This paper aims to find a relationship between signal to noise ratio (SNR) and a 802.11g networkpsilas QoS in terms of latency, packet loss and jitter. It has been created a software tool that obtains different TCP parameters from a file which contains the data about the packet transfer between two nodes in the network. Wepsilave found an instable behavior during the test series because of the nature of wireless networks. Besides, wepsilave pointed out how the delay and the packet loss are affected as the SNR ratio decreases, while jitter has an exponential growth when the signal decreases from 19 to 11 dB. Wepsilave found that the optimal range for most of the real time applications (as VoIP) goes from 34-90 dB, at this range we can find a good QoS in the network performance.