FPGA Implementation of Real-Time Secure OFDM Transmission Using Digital Chaos

The real-time implementation is demonstrated using Field-Programmable Gate Array (FPGA) hardware with Xilinx System Generator (XSG), for secure orthogonal frequency division multiplexing (OFDM) transmission. Vivado software and Verilog programming language are used for the purpose of the real-time system design and the OFDM data transmission. An encrypted 16-QAM OFDM data transmission and recovery are successfully carried out using FPGA. The multi-fold data encryption is achieved via the input data encryption using XOR, real and imaginary parts of QAM symbols encryption, where the chaotic sequences are generated by a hyper digital chaos. As a result, it provides a key space of ~10²² to enhance the confidentiality of OFDM data transmission.