A Novel Physical Layer Authentication With PAPR Reduction Based on Channel and Hardware Frequency Responses
A Novel Physical Layer Authentication With PAPR Reduction Based on Channel and Hardware Frequency Responses
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DOI：
10.1109/tcsi.2019.2952936
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发表时间：
2020-02
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影响因子：
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通讯作者：
Prasidh Ramabadran;P. Afanasyev;D. Malone;M. Leeser;D. McCarthy;Bill O'Brien;R. Farrell;J. Dooley
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文献类型：
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作者：
Prasidh Ramabadran;P. Afanasyev;D. Malone;M. Leeser;D. McCarthy;Bill O'Brien;R. Farrell;J. Dooley
预计5G等下一代无线通信将具有数百兆赫的宽带带宽。随着带宽的增加，由频率依赖行为引起的电路损伤，如增益和群延迟的纹波和倾斜，变得更加显著。OFDM信号的PAPR也随着子载波数量的增加而增加。需要对宽带频率响应的发射机电路进行特性描述，以对要传输的信号进行预补偿。在本文中，我们提出了一种新的方案，该方案利用电路特性与信道响应相结合来生成加密信号的密钥，从而在物理层提供额外的安全层。除了采用Diffie Hellman方案对比特进行加密外，还对目标信号的调制星座进行相位分散加密。实验还表明，该方法能够降低OFDM信号的PAPR。该方案在28.9 GHz毫米波无线链路上进行了端到端实验验证，证明了在具有1664个有源QPSK调制子载波的2048点OFDM信号中，针对定位良好的窃听者的安全性和减少3.5 dB的PAPR。
Next generation wireless communications such as 5G are expected to feature wide channel bandwidths on the order of hundreds of MHz. As bandwidths increase, circuit impairments caused by frequency dependent behaviour such as ripple and tilt in gain and group delay become more significant. PAPR of OFDM signals also increase with increasing number of sub-carriers. Transmitter circuit characterisation for the wide-band frequency response is needed to pre-compensate the signal to be transmitted. In this article, we propose a novel scheme which uses the circuit characteristics combined with the channel response to generate the keys for encrypting signals to provide an additional tier of security at the physical layer. The modulated constellation of the signal of interest is encrypted by dispersing its phases in addition to encrypting the bits using Diffie Hellman scheme. It is also shown that the method is able to reduce the PAPR of OFDM signals. This scheme is experimentally validated from end-to-end on a millimetre wave wireless link at 28.9 GHz demonstrating security against a well-positioned eavesdropper and a reduction of PAPR by 3.5 dB in a 2048 point OFDM signal with 1664 active QPSK modulated sub-carriers.