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Precoder Design for Cooperative Cognitive Radio Systems

Budhathoki, Krishna Ram
http://rave.ohiolink.edu/etdc/view?acc_num=akron1363180310

Abstract Details

2013, Master of Science in Engineering, University of Akron, Electrical Engineering.
Cognitive radio (CR) has been an active area of research in wireless communication in recent years. In this thesis, optimal transmission strategies at the source and relay nodes in cooperative underlay CR systems assumption are studied with an aim of achieving maximum possible throughput for the secondary system for two different scenarios: one with multiple secondary relay nodes with a single antenna at each of the source, relay and destination nodes of the secondary system, and the other with a single secondary relay node with multiple antennas at each of the source, relay and destination nodes of the secondary system. In particular, an amplify-and-forward (AF) relaying secondary system is considered that operates in the presence of a primary system. For the first scenario, the joint relay and power allocation problem is studied under power constraints at the source and the relay of the secondary system and the interference constraint from the secondary source and relay to the primary users (PUs). An optimal relay selection and power allocation scheme is first proposed. Since the proposed scheme requires an exhaustive search over all candidate relay nodes, to reduce complexity, a non-exhaustive sub-optimal search method is also proposed with performance near to that of the optimal scheme. In the second scenario, the problem of relay and source precoder design in a multi-antenna non-regenerative relaying CR system is studied assuming underlay spectrum sharing methodology with the PUs. The optimal structure of the relay and source precodering matrices are derived for the cases of dominant power and dominant interference constraints. However, deriving optimal precoding scheme in a more general case is not straightforward, therefore, a sub-optimal structure is proposed when both the power and interference constraints are present. Finally, a novel iterative algorithm is proposed for the joint design of relay and source precoding matrices. Simulation results for different scenarios show that the proposed schemes significantly improve the performance in terms of the achievable throughput.
Hamid Reza Bahrami, Dr. (Advisor)
George C. Giakos, Dr. (Committee Member)
Kye-Shin Lee, Dr. (Committee Member)
79 p.
Electrical Engineering
cognitive radio; multi-input multi-output (MIMO); non-regenerative relaying; capacity; precoder design

Recommended Citations

Citations

  • Budhathoki, K. R. (2013). Precoder Design for Cooperative Cognitive Radio Systems [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1363180310

    APA Style (7th edition)

  • Budhathoki, Krishna Ram. Precoder Design for Cooperative Cognitive Radio Systems. 2013. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1363180310.

    MLA Style (8th edition)

  • Budhathoki, Krishna Ram. "Precoder Design for Cooperative Cognitive Radio Systems." Master's thesis, University of Akron, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1363180310

    Chicago Manual of Style (17th edition)

akron1363180310
536
© 2013, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.