SNR wall and cooperative spectrum sensing in cognitive radio under noise uncertainty |
| |
Authors: | Haijun Wang Xin Su Yi Xu Xiang Chen Jing Wang |
| |
Institution: | Tsinghua National Laboratory for Information Science and Technology,Tsinghua University, Beijing 100084,China |
| |
Abstract: | Cooperative energy spectrum sensing has been proved effective to detect the spectrum holes in Cognitive Radio (CR). However,
its performance may suffer from the noise uncertainty, which is portrayed by the SNR wall in some literatures. In this paper
we analyze the spectrum sensing performance under noise uncertainty and find an alternative approach to obtain the SNR wall.
Then the average SNR wall is proposed to illustrate the statistically average impact of noise uncertainty. In addition, the
cooperative sensing performance under noise uncertainty with AND rule is discussed. Analyses and numerical results show that
cooperative sensing can significantly improve the sensing performance under the condition of noise uncertainty. |
| |
Keywords: | Cooperative spectrum sensing Noise uncertainty SNR wall |
本文献已被 维普 万方数据 SpringerLink 等数据库收录! |