Cognitive Radio Networks Thesis

Cognitive Radio Networks Thesis-11
In this research, an intelligent spectrum mobility and resource management frame-work in CR ad hoc networks is explored.In particular, five spectrum mobility and resource management issues in CR ad hoc networks are investigated: 1) global time synchronization in CR ad hoc networks; 2) spectrum sensing scheduling scheme to dif-ferentiate the signals from primary users (PUs) and secondary users (SUs); 3) power control scheme for concurrent transmissions of location-aware mobile cognitive radio ad hoc networks; 4) jointly power adaptation and spectrum handoff scheme in mobile cognitive radio networks; and 5) end-to-end congestion control scheme in multi-hop cognitive radio ad hoc networks.Today, we already have over a dozen wireless technologies in use: Wi Fi, Bluetooth, Zig Bee, NFC, LTE, earlier 3G standards, satellite services, etc.

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The contributions of the research include: 1) fundamentally solving the global time synchronization problem for the CR ad hoc network in a time and location-varying spectrum environment.

2) Joint power control, frequency selection, and spectrum handoff is proposed in mobile CR ad hoc network.

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A doubtful user that fails the double adaptive threshold test is declared as a malicious user.

The results of the legitimate users are combined at the fusion center by utilizing Dempster-Shafer (DS) evidence theory.

Cognitive radio (CR) technology has emerged as a promising solution to realize dynamic spectrum access (DSA).

With the capability of sensing the frequency bands in a time and locationvarying spectrum environment and adjusting the operating parameters based on the sensing outcome, CR technology allows an unlicensed user to exploit the licensed channels which are not used by licensed users in an opportunistic manner.

One way of improving spectral efficiency is to share the spectrum amongst different coexisting networks and serve multiple devices simultaneously.

Spectrum sharing mechanisms for coexistence of a licensed network, such as LTE, with an unlicensed network, such as Wi-Fi, are being considered in the recent literature and standardizations.

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