Experimental Implementation of Real-Time Non-Orthogonal Multi-Carrier Systems in a Realistic Fading Channel

Spectrally efficient frequency division multiplexing (SEFDM) has the potential to improve spectrum utilization through bandwidth compression at the cost of self-induced inter-carrier interference. In this paper, an experimental test-bed is designed and implemented to evaluate the performance of SEFDM systems in real-time using frequency-domain channel estimation/equalization and iterative signal detection. Our innovation lies in the development and experimental, real-time implementation of baseband generation, signal assembly, signal decoding and a novel frequency-domain channel estimation and equalization method for the SEFDM transceiver. Our system compresses the transmitted signal bandwidth up to 60%, 30% and 20% for BPSK, QPSK and 8PSK respectively, offering significant bandwidth savings, and moving towards satisfying one of the key 5G challenges

Security analysis of IoT networks and platforms

With the recent increase in the adoption of Internet of Things (IoT) technology globally, cybersecurity-related issues have been raised, particularly with the limitations of IoT devices, privacy and other security standards guiding IoT development as wireless technology evolves. With the enterprise and the massive IoT market expected to reach $7.6 B and$1.2 B in 2024 respectively, according to Gartner, and several operational vertical IoT use cases and platforms experiencing cyber vulnerabilities. Based on the findings from our recent LPWANs IoT testbeds and their operational performance in certain use case scenarios, this paper summarizes the key wireless technology security requirements for IoT deployments. We first compare the security requirements of legacy and emerging IoT technologies as it relates to smart city applications and examined the effectiveness of the existing countermeasure opportunities as it affects the overall system performance in critical and non-critical machine type communications. We concluded by recommending countermeasures opportunities and frameworks to secure industrial IoT platforms to cope with future cybersecurity vulnerabilitie