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The security in 5G Internet of Things (IoT) is considerably different as the low power constraints and complexity features of many IoT devices are limiting the use of conventional cryptographic techniques. The fast Fourier transform (FFT) based multicarriers like orthogonal frequency division multiple access (OFDMA) and the similar non orthogonal counterparts are the preferred waveforms in 5G due to their resilience to fading and ease of implementation. Here a scheme to chaotically rearrange the frequency subcarriers is proposed which will not only provide a relatively simple physical layer security (PLS) with minute changes in existing OFDM based transceiver as per the low complexity, low power requirements of IoT but also improve the bit error rate (BER) performance by utilizing the diverse nature of the channel. The scheme provides an alternate approach to conventional higher layer security, by doing so at physical layer which will be suitable for most FFT based waveforms which have been proposed in 5G especially narrow band IoT (NB IoT) , massive machine-type communication (mMTC) and ultrareliable low latency communicationis (URLLC).maintain uniformity in the final print version of the journal. Both form and content of the paper has to be as per these guidelines else your paper will not be published even though its content has been accepted.

A SimpleEncryption Approach to 5G Multicarrier Based Waveform Utilizing Subcarrier Frequency Diversity with Improved BER Performance