1 research outputs found
A Novel Physical Layer Authentication With PAPR Reduction Based on Channel and Hardware Frequency Responses
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 subcarriers. 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