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Publications by Type: Diplomarbeiten

Wireless Noise Analysis and Modeling for BOWL Network
Citation key J-WNAMBN-12
Author Juhre, Thomas
Year 2012
Address Berlin, Germany
Month March
School Technische Universit├Ąt Berlin
Abstract In the field of wireless communication, environmental noise is defined as any unwanted signal from external sources interfering and distorting the monitored signal, and varies with time and location. Investigations [3, 4, 5] revealed that environmental noise extensively affects the packet delivery under certain circumstances, in particular if the ratio between signal power and noise power level is very low. In this diploma thesis, real measurement data of environmental noise in the 2.4 GHz frequency band of the Berlin Open Wireless Lab (BOWL) testbed are analyzed. The BOWL project at Technische Universit├Ąt Berlin (TUB) maintains an 13-node Asus router wireless outdoor mesh network deployed on the rooftops of the TU Berlin campus and also an 9-node Wistron CM9 router indoor mesh network. The testbed is used for Internet access and wireless networking experimentation including real network traffic. One application of the noise analysis is in wireless network simulations, which depends on knowledge of the statistical distribution of packet reception for each node. One of the variables which is considered in the distribution function is noise. In order to have a better understanding on modeling environmental noise in BOWL outdoor and indoor network, two different measurement data sets, each generated by another wireless driver, for each node of BOWL are analyzed. Characteristics of noise, such as the night and day effect, time intervals with constant periods or repeating patterns sampled on each IEEE 802.11 Atheros radio in BOWL network are of main interest. In the first part, the data sets are examined with regard to consistency, correctness and plausibility, since they are generated by a new measurement tool called wprobe. The second part analyzes traces of a duration of 24 hours in order to get insights about shortterm characteristics of noise and on the other hand, traces of a duration of 5 days in order to study long-term characteristics for the outdoor and the indoor network of BOWL. The last part introduces 2 models that aim to represent the noise floor of BOWL outdoor and indoor nodes.
Bibtex Type of Publication Diplomarbeit
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