Date of Award

5-26-2015

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Systems Engineering

First Advisor

Seshadri Mohan

Abstract

Cognitive radio technology, a revolutionary communication paradigm that can utilize the existing wireless spectrum resources more efficiently, has been receiving a growing attention in recent years. Our study is motivated by the fact that researchers are beginning to unveil different obstacles in the practicability of cognitive radio (CR) and, consequently, an urgent need has arisen to demonstrate practical implementations of CR technology. Specifically, this study seeks to implement a scenario in which two mobile phones communicate with each other using CR technology. Since commercially available mobile phones do not have the capability to dynamically adapt the operating parameters to function in any available frequency spectrum, a Universal Software Radio Peripheral (USRP), a MATLAB instance and a mobile phone are assumed to be a single device. Alternatively, it is our assumption that, in the future, mobile phones will have such capabilities incorporated in them. Two of such integrated CR-capable devices sense the frequency spectrum for available channels, and then share the channels' statuses with each other. Subsequently, those channels that are sensed to be unoccupied by both devices are used for transmission. As a common channel must exist for devices to share channel status information, User Datagram Protocol (UDP) was used for this purpose. For the actual data transmission between devices on the unoccupied channels, Quadrature Phase Shift Keying (QPSK) Modulation is used in this research. In essence, this research proposes a cost effective and efficient way to provide broadband to rural areas using CR technology with the mobile phone data transmission as a case study.

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