Embedded physical-layer authentication in cognitive radio requires efficient low-rate channel coding schemes

作者：Wu, Xiaofu^*

来源：IET Communications, 2017, 11(3): 400-404.

DOI：10.1049/iet-com.2016.0812

• AWGN channels
• radio receivers
• cryptography
• digital signatures
• cognitive radio
• channel coding
• embedded physical-layer authentication
• low-rate channel coding
• embedded cryptographic signature authentication
• physical layer
• log-likelihood ratio
• equivalent authentication channel
• secondary receiver
• binary-input additive white Gaussian noise channel
• sphere-packing lower bound
• transmission capability
• finite-length authentication tags
• primary receivers

In this study, the author investigates the practical limitation of the recently proposed embedded cryptographic signature authentication scheme at the physical layer. By employing the log-likelihood ratio of a tag bit and its approximation, the author shows that the equivalent authentication channel observed by the secondary receiver can be viewed as a binary-input additive white Gaussian noise channel. Then, the sphere-packing lower bound can be employed to show the transmission capability for practical finite-length authentication tags. To achieve the same effective coverage area for both the primary and secondary receivers, it essentially requires efficient low-rate channel coding schemes with near sphere-packing-bound performance at the secondary receiver, which contrasts sharply with the pessimistic conclusion of Jiang et al.

• 出版日期2017-2-16
• 单位南京邮电大学