Throughput Analysis of a Cognitive Multi-hop Wireless Network Overlaid on a Cellular Network

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Soleimani, Hosein | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42265 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Ashtiani, Farid
Abstract:
In this thesis, we evaluate the maximum stable throughput of a cognitive multi-hop IEEE 802.11-based WLAN overlaid on a cellular network. In the considered scenario, the secondary users operate in the downlink or uplink frequency band of primary network and transmit their data in free primary channels using OFDM technique. The activity of primary nodes is modeled independently by ON-OFF alternating states. To model the scenario, each secondary user is modeled with an open queueing network. The queueing network can model the transmission of data as well as the effect of primary users. By writing the traffic equations of the queueing network and applying the stability conditions, we are able to find the maximum stable throughput, i.e., the maximum rate of packet generation at the cognitive nodes guaranteeing the stability of all nodes. Simulation results confirm the validity of our analytical approach. We also evaluate the effect of the primary and secondary networks parameters on maximum stable throughput of secondary network
Keywords:
Cognitive Radio ; Queueing Network ; Maximum Stable Throughput ; Institiute Electrical and Electronic Engineers (IEEE)802.11 Standard ; Wireless Local Area Network

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