SDR based secure communication system with novel noise modulated transmission

Xin Tian; Wenhao Xiong; Zhonghai Wang; Dan Shen; Nichole Sullivan; Genshe Chen; Khanh Pham

doi:10.1117/12.2520671

29 July 2019 SDR based secure communication system with novel noise modulated transmission

Xin Tian, Wenhao Xiong, Zhonghai Wang, Dan Shen, Nichole Sullivan, Genshe Chen, Khanh Pham

Proceedings Volume 11017, Sensors and Systems for Space Applications XII; 110170H (2019) https://doi.org/10.1117/12.2520671
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

In many military and law-enforcement covert missions, wireless communication links need to remain undetected. In this paper, a novel spectrum spread technique based on noise modulated (NM) transmission is proposed and a feasibility study was conducted. In NM transmissions a reference pseudo-noise signal is generated and is superposed with the information signal, with a time delay. The pseudo-random noise sequence is transmitted separately and used to recover the signal from the noise modulated information signal. The transmitted information signal is noise like making it difficult to detect or decode by an adversary. If an adversary does discover the transmission, decoding is difficult without the pseudo-random noise sequence and time delay between noise and signal. Conventional NM uses polarized antennas to orthogonally transmit the noise modulated information signal and pseudo-noise signal. However, the two polarized antennas are rarely, if ever, completely isolated in practice making signal recovery difficult if not impossible. In this paper a feasibility study was performed on a novel multi-frequency NM scheme for NM communications with a single polarized antenna. A universal software radio peripheral (USRP) software defined radio (SDR) testbed was used to demonstrate that multi-frequency NM transmission masks a QPSK signal from an adversary and the signal can be successfully recovered by a friendly receiver.

Conference Presentation

Citation Download Citation

Xin Tian, Wenhao Xiong, Zhonghai Wang, Dan Shen, Nichole Sullivan, Genshe Chen, and Khanh Pham "SDR based secure communication system with novel noise modulated transmission", Proc. SPIE 11017, Sensors and Systems for Space Applications XII, 110170H (29 July 2019); https://doi.org/10.1117/12.2520671

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