Data Transmission over
EE/CS M171L
Fall 2010
Raw Data Sheet
Lab 3: Data Transmission over 802.11b Wireless LAN
Date 2014/02/20
2. Observation:
The main goals for the experiment 3 are first, to get basic knowledge of various factors affecting data throughput in a wireless channel, second, to analyze effect of sporadic losses on TCP throughput and finally, to familiarize with basic performance measurement tools in computer networks. In order for us to accomplish these goals, we conduct two experiments. First, we measure UDP and TCP data throughput using Iperf measurement tool at different locations in Boelter Hall. Second, we measure UDP and TCP data throughput in Lab with and without effect of microwave turned on.
For the first part of experiment, where we perform TCP and UDP throughput vs. Signal Strength as distance varies, I observed that as the distance increases, the value of both UDP and TCP data rate decreases. At a 30ft distance from access point, UDP and TCP had almost the same values but as the distance increases, TCP Data Rate drops significantly compared to UDP. As the distance increases, noise power increases because of many other factors such as interaction from other computers and increase in noise power result signal strength to decrease as well. Since signal to noise ratio is signal strength – noise power, SNR also decrease as the distance increases.
For the second part of experiment, where we observe noise and throughput in presence of Microwave Oven, I noticed that as microwave oven level increases from Warm to High, there is more interference between two computers. As the power level increases, throughput for both TCP and UDP should decrease but since there were so many interferences from microwave, graph fluctuate in the beginning and at the end for TCP instead of just decreasing. We also measured the peak values and position of the peak value in frequency. Peak should be high at warm but last short because of lower power
Fall 2010
Raw Data Sheet
Lab 3: Data Transmission over 802.11b Wireless LAN
Date 2014/02/20
2. Observation:
The main goals for the experiment 3 are first, to get basic knowledge of various factors affecting data throughput in a wireless channel, second, to analyze effect of sporadic losses on TCP throughput and finally, to familiarize with basic performance measurement tools in computer networks. In order for us to accomplish these goals, we conduct two experiments. First, we measure UDP and TCP data throughput using Iperf measurement tool at different locations in Boelter Hall. Second, we measure UDP and TCP data throughput in Lab with and without effect of microwave turned on.
For the first part of experiment, where we perform TCP and UDP throughput vs. Signal Strength as distance varies, I observed that as the distance increases, the value of both UDP and TCP data rate decreases. At a 30ft distance from access point, UDP and TCP had almost the same values but as the distance increases, TCP Data Rate drops significantly compared to UDP. As the distance increases, noise power increases because of many other factors such as interaction from other computers and increase in noise power result signal strength to decrease as well. Since signal to noise ratio is signal strength – noise power, SNR also decrease as the distance increases.
For the second part of experiment, where we observe noise and throughput in presence of Microwave Oven, I noticed that as microwave oven level increases from Warm to High, there is more interference between two computers. As the power level increases, throughput for both TCP and UDP should decrease but since there were so many interferences from microwave, graph fluctuate in the beginning and at the end for TCP instead of just decreasing. We also measured the peak values and position of the peak value in frequency. Peak should be high at warm but last short because of lower power