SDR Proof-of-Concept of Full-Duplex Jamming for Enhanced Physical Layer Security

Abstract

In order to secure wireless communications, we consider the usage of physical-layer security (PLS) mechanisms (i.e., coding for secrecy mechanisms) combined with self-interference generation. We present a prototype implementation of a scrambled coding for secrecy mechanisms with interference generation by the legitimate receiver and the cancellation of the effect of self-interference (SI). Regarding the SI cancellation, four state-of-the-art algorithms were considered: Least mean square (LMS), normalized least mean square (NLMS), recursive least squares (RLS) and QR decomposition recursive least squares (QRDRLS). The prototype implementation is performed in real-world software-defined radio (SDR) devices using GNU-Radio, showing that the LMS outperforms all other algorithms considered (NLMS, RLS and QRDRLS), being the best choice to use in this situation (SI cancellation). It was also shown that it is possible to secure communication using only noise generation by the legitimate receiver, though a variation of the packet loss rate (PLR) and the bit error rate (BER) gaps is observed when moving from the fairest to an advantageous or a disadvantageous scenario. Finally, when noise generation was combined with the adapted scrambled coding for secrecy with a hidden key scheme, a noteworthy security improvement was observed resulting in an increased BER for Eve with minor interference to Bob.

Hiding Messages in Secure Connection Transmissions with Full-Duplex Overt Receiver

“…For example, privacy information in health care, the journey or location of vehicles in transportation and the position or confidential information of the targets need to be protected. Regarding security protection for wireless communications, several conventional approaches, such as cryptography [ 1 ] or physical layer security [ 2 , 3 , 4 ], have been implemented. These methods only target preventing the confidential content of messages from being stolen by eavesdroppers.…”

Secrecy Coding Analysis of Short-Packet Full-Duplex Transmissions with Joint Iterative Channel Estimation and Decoding Processes

“…The presence of SI will reduce the Signal-to-Noise Ratio (SNR) at the receiver and leads to low overall performance. Considering the PLS in FD transmission, the security approaches involving the simultaneous transmission of the self-jamming or Artificial Noise (AN) have attracted a huge research interest due to their robustness promising performance [ 13 , 14 ]. The self-jamming technique is usually used to make the interception and the correct message decoding impossible for the eavesdroppers, even if they have equivalent or better channel conditions than the legitimate receiver.…”

Low-Cost Sensor Based on SDR Platforms for TETRA Signals Monitoring

“…The main characteristics of an SDR platform that will influence the performance of a monitoring station are as follows: frequency range, sampling frequency and resolution of the digital–analog converter [ 16 , 17 , 18 ]. The applications of SDR platforms have expanded as a result of the benefits offered by software processing, a series of results that have been recently reported in many areas [ 19 , 20 , 21 , 22 ].…”