Securing the Physical Layer in the OFDM-Based Internet of Things (IoT) by Using Frequency Hopping Technique

The physical layer security in the context of the internet of things is still one of the challenges due to the resource constraints of the end terminals and the IoT network heterogeneity. Although it has been adopted by different wireless applications due to its high spectral efficiency, the OFDM physical layer remains a challenge. The frequency hopping technique is used to protect the nodes from jamming and eavesdropping attacks. The cyclic prefix manipulation has been simulated against different time-delayed paths and the simulated results compared to the theoretical ones. The comparison shows a close match and the guard width encryption mechanism worked as desired.