ABSTRACT
Short-range communications happen to be the hotspot in 5G/6G wireless communication, and hence there is a need for high data rates to satisfy their needs in 5G/6G. Orthogonal frequency division multiplexing (OFDM)-based short-range communication provides high data rates by utilizing the spectrum effectively. Multiband (MB)-OFDM provides higher data rates and reliability. MB-OFDM and different modulation techniques, such as quadrature phase shifting key (QPSK), dual carrier modulation (DCM), 16-quadrature amplitude modulation (QAM), and 64-QAM have been combined to transmit the data streams at a high data rate and improve the system throughput significantly. There is a need to implement and optimize the MB-OFDM architectures on real-time hardware systems using embedded processors. In this chapter, MB-OFDM and modulation techniques are implemented, analyzed, and optimized for different advanced RISC machine (ARM)-based embedded architectures. A software reference model for the MB-OFDM system is developed in MATLAB. The bit error rate (BER) performance of the MB-OFDM technique combined with different modulation schemes over additive white Gaussian noise (AWGN) channels is studied. The software reference model is used to implement and benchmark the system in C using the ARM development suite and Xilinx tools. Higher modulation techniques provided very high data rates compared to QPSK and DCM. Image data is serialized and used as input for evaluating the performance of the system. Performance metrics such as mean square error (MSE) and peak signal-to-noise ratio (PSNR) are computed for the MB-OFDM technique for the different images considered and compared with other modulation techniques. Simulation results of MB-OFDM combined with QPSK indicate BER at a data rate of 480 Mbps varies from 10-2.9 to 10-3.9 at a fixed SNR of 6 dB. With DCM for a data rate of 480 Mbps, BER is found to be between 10-3 and 10-4 for the same SNR. Among the higher modulation techniques, with 16-QAM, a high data rate of 3.84 Gbps and a BER of 10-2.6 to 10-3.8 are obtained, and with 64-QAM, the data rate achieved is 8.64 Gbps and the BER lies between 10-0.6 to 10-0.8, both at 12 dB SNR. The processor implementation and design of the system for architecture analysis are performed over ARM Cortex-A (8, 9, 15, 17, 53) families, and benchmarks are carried out to analyze the code execution and code coverage with and without optimization. ARM Cortex-A 53 outperforms other cores. In the future, the system improvement will be performed with a low-power design and further enhanced with higher data rates with the addition of MIMO.
Key words: Wireless communication, optimization for short range IoT, Modulation techniques.
Network Security and Data Privacy in 6G Communication
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