Distributed spectrum sensing and access in cognitive radio network and its application in small cell network

• Main Authors: Lee, Chang-Shen, 李常慎
• Other Authors: Lee, Ta-Sung
• Format: Others
• Language: en_US
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/91529081220595047636

碩士 === 國立交通大學 === 電信工程研究所 === 102 === In this thesis, we analyze the distributed multi-channel spectrum sensing and access problem in cognitive radio network. The sensing and access problem is first formulated as a constrained optimization problem, and the optimal sensing time and transmit power are solved for the secondary users. To alleviate the computational complexity of the above scheme, we propose a low-complexity threshold-based scheme, and derive its analytical solution. Applying the concept of proposed threshold-based scheme and dynamic data driven applications systems (DDDAS), we propose a distributed traffic-aware distributed sensing and access scheme to enhance the system energy efficiency in small cell networks. Finally, computer simulation results show that the proposed schemes can achieve higher throughput and energy efficiency compared to prior benchmark schemes in cognitive radio network and small cell network, respectively.