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Research on Spectrum Sensing Technologies in Cognitive Radio

Author: ChenGuoZhong
Tutor: TangJiaShan
School: Nanjing University of Posts and Telecommunications
Course: Signal and Information Processing
Keywords: Cognitive radio Spectrum sensing Covariance matrix Orthogonal Frequency Division Multiplexing Energy consumption is limited
CLC: TN925
Type: Master's thesis
Year: 2012
Downloads: 87
Quote: 0
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Abstract


Along with the continuous development of the wireless communication technology, wireless spectrum resource demand growing, leading to lack of spectrum resources becomes increasingly obvious, and at the same time, the current fixed spectrum allocation mechanism also take full advantage of the limited spectrum resources, resulting in spectrum utilization is low. Cognitive radio technology proposed to resolve the problem of the lack of spectrum resources and spectrum utilization low, a new way of thinking, is considered the best way to solve the above problems. Spectrum sensing technology as the key of cognitive radio technology is the most important prerequisite for cognitive radio applications, improve the spectrum utilization of the cognitive system. This paper studies the cognitive radio spectrum sensing technology, the completion of the work consists of two main parts: in the first part of this article will be extended to the multi-user cooperative spectrum sensing Cholesky decomposition based on the covariance matrix of the single-user spectrum sensing, based Association cooperative spectrum detection algorithm Cholesky decomposition of covariance matrix, the joint use of cognitive users fully cooperate detection to improve the detection performance. In addition, the article also put forward a Cholesky decomposition based on the covariance matrix of the improvement of the cooperative spectrum sensing algorithm based on cognitive user receives the signal correlation, to choose strong cognitive user participation spectrum detection, effectively reducing computational complexity of the algorithm. In the second part of this article detection model based on cognitive OFDM multi-carrier system, given the multi-carrier joint spectrum sensing algorithms and multi-carrier joint spectrum sensing algorithm is applied to energy consumption and limited cognitive OFDM system is proposed energy consumption constrained multi-carrier joint detection algorithm, that at a given perception under the constraints of energy consumption, through the establishment maximize throughput optimization model, combined with multiple carriers select optimal perception of time and decision threshold parameters, making cognitive users The total throughput is maximized. Finally, the simulation results show that the multi-carrier joint spectrum sensing algorithm greater throughput than traditional spectrum sensing algorithm can achieve energy consumption equipartition spectrum sensing algorithm compared energy consumption constrained multi-carrier joint spectrum sensing algorithm achieve greater throughput, and thus better able to save energy. The text is divided into five chapters, the first chapter introduces the research background, significance, status and structure of the paper arrangements; outlined in Chapter spectrum sensing in cognitive radio technology theory; Chapter III study based on the covariance matrix of cooperative spectrum sensing technology; Chapter spectrum sensing techniques in cognitive OFDM system; Chapter Summary and Outlook of the full text of the work.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Radio relay communications,microwave communications
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