Secret Key Transmission for OFDM based Machine Type Communications
"Machine type communications (MTC) play a crucial role
in the Internet of things (IoT) where a number of devices are connected
by wireless communications. Unfortunately, wireless communications
are prone to various security threats including eavesdropping
due to the broadcast nature. In this paper, we propose
an approach that can generate a sequence of random numbers
for a secret-key in an orthogonal frequency division multiplexing
(OFDM) system. Since the random key is based on channel
dependent signature (CDS) and generated without any predetermined
sequences, a device can have a unique secret-key in the proposed
approach, which suits to MTC for secure communications.
The resulting approach is called CDS based secure OFDM (CDSSOFDM).
We also modify the CDS-SOFDM scheme to transmit
more bits using multiple blocks."