Description: Cognitive radio frequency spectrum detection-The spectrum sensing of a wideband frequency range is studied by dividing it into multiple subbands.
It is assumed that in each subband either a primary user (PU) is active or absent in a additive white Gaussian
noise environment with an unknown variance. It is also assumed that at least a minimum given number of
subbands are vacant of PUs. In this multiple interrelated hypothesis testing problem, the noise variance is
estimated and a generalised likelihood ratio detector is proposed to identify possible spectrum holes at a
secondary user (SU). Provided that it is known that a specific PU can occupy a subset of subbands
simultaneously, a grouping algorithm which allows faster spectrum sensing is proposed. The collaboration of
multiple SUs can also be considered in order to enhance the detection performance. The collaborative
algorithms are compared in terms of the required exchange information among SUs in some collaboration
methods. The simulation results show that the propos Platform: |
Size: 231424 |
Author:phillis |
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Description: 由于实际信道中的多径和阴影效应，单个认知用户频谱感知的性能受到影响，因此需要靠不同用户间的协同频谱感知来对抗多径和阴影效应。本设计要求在文中采用一种协作机制，即两用户进行协作频谱感知，提高主用户的检测率，减少检测时间，并且得到捷变增益。要求给出仿真结果。-As the actual channel of the multi-path and shadow effect, a single user of spectrum sensing of cognitive performance are affected, it needs to depend on collaboration between different users of spectrum sensing to combat multipath and shadow effects. The design requirements in the text using a cooperation mechanism, namely, two user collaborative spectrum sensing, to improve the detection rate of the primary users, reducing detection time, and get agility gain. Required to give simulation results. Platform: |
Size: 719872 |
Author:林熙怡 |
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Description: 协作频谱感知虽然可提高系统的感知性能， 但随着感知节点数目的增加， 系统资源的占用越来越多，
系统传输效率下降． 分析了协作频谱感知方法的感知性能， 得到协作频谱感知的感知性能与感知节点数目和接
收信噪比之间的关系， 提出了一种新的次级用户节点的选择方法， 该方法有效保证了所选择节点的感知性能，
仿真验证了该算法的有效性和可靠性．-Although the cooperative spectrum sensing can improve the perceived performance of the system, but with the perception of the number of nodes increases, more and more system resources, the system transmission efficiency decreased. Cooperative spectrum sensing method of analysis of the perceived performance of collaborative spectrum sensing by the perception of performance and perception of the number of nodes and the relationship between the received SNR, a new secondary user node selection method, which effectively guarantee perceived performance of the selected node, the simulation proves the validity and reliability. Platform: |
Size: 1068032 |
Author:江中 |
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Description: 在认知无线电中，频谱感知的方法有很多，协作频谱感知克服了单节点频谱感知的缺点，特别是在衰减信道中。-In CR, spectrum sensing has many methods. The collaborative sensing is better than the single sensor sensing as a result of making the fading. Platform: |
Size: 567296 |
Author:Eric |
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Description: This code implements an energy efficient collaborative cyclostationary spectrum sensing approach for cognitive radio systems. An existing statistical hypothesis test for the presence of cyclostationarity is extended to multiple cyclic frequencies and its asymptotic distributions are established. Collaborative test statistics are proposed for the fusion of local test statistics of the secondary users, and a censoring technique in which only informative test statistics are transmitted to the fusion center (FC) during the collaborative detection is further proposed for improving energy efficiency in mobile applications. Moreover, a technique for numerical approximation of the asymptotic distribution of the censored FC test statistic is proposed. Platform: |
Size: 45056 |
Author:oyix |
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Description: 基于协作的认知无线电中，AF，DF协议及未采用协作分集技术的中断概率的实验仿真程序-In collaborative spectrum sensing cognitive radio, AF, DF protocol and did not use cooperative diversity outage probability experiment simulation program Platform: |
Size: 2048 |
Author:han cai |
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Description: 联盟博弈频谱感知，包括融合和分裂算法，本科毕设时用的，看下面的英文文献，是对应的文章中仿真的哈，推荐-coalitional games for distributed collaborative spectrum sensing in cognitive radio network Platform: |
Size: 2048 |
Author:June |
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Description: 协作频谱感知，提供了原文，可以参考着看一下，对于初学者有一定的作用(Collaborative spectrum sensing, providing the original text, you can refer to it and have a certain effect on beginners.) Platform: |
Size: 868352 |
Author:wenshijieya |
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