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Demonstrating Frequency Hopping Aided OFDM-DCSK and Low-rank Approximation of Matrices Based Transmissions via USRP

In this paper, we construct the frequency hopping orthogonal frequency division multiplexing-aided differential chaos shift keying (FH-OFDM-DCSK) transmitter and the low-rank approximation of matrices (LRAM) aided receiver via the universal software radio peripheral (USRP) platform. At the transmitter, the chaotic frequency hopping (FH) operation is performed in the frequency domain before the inverse fast Fourier transform (IFFT) to improve the security of the system and attain the diversity gain. At the receiver, the LRAM detection is conducted to improve the bit error rate (BER) performances. Then we construct the functional modules of the paired FHOFDM-DCSK transmitter and the LRAM based receiver using USRP. Subsequently, we build up the demonstration system with USRP and investigate the performances over real wireless channels. Experimental results validate that the system can provide secure video transmissions for legitimate users with better reliability performances, while the eavesdroppers can hardly recover the information in real time.