Abstract
Media-based modulation (MBM) is a recently proposed modulation scheme which has the advantages of increased spectral efficiency and improved performance. In this paper, a physical layer security (PLS) scheme is proposed for the multiple-input multiple-output (MIMO) media-based modulation system using generalized spatial modulation (GSM) to resist the passive eavesdropping from a multiple-antenna eavesdropper. Secure mapping rules between the information bits and the transmit patterns are designed based on the abundant legitimate channel realizations of the MIMO MBM system. Due to the independent fading of the legitimate link and the eavesdropping link, the designed mapping rules are unavailable and appear random to the eavesdropper. Therefore, the correct detection of the information bits at the eavesdropper is prevented, which is validated through bit error rate (BER) analysis and simulations. The ergodic secrecy rate is analyzed and a tight closed-form approximation is derived. Simulation results show that the proposed secure GSM MBM scheme outperforms the existing secure MBM schemes without consuming jamming power or requiring eavesdropper’s channel state information.
Highlights
Multiple-input multiple-output (MIMO) systems have been widely used in the wireless networks
We can see from the curves with [Nt, Nr, Rm, M, nrf ] = [4, 1, 1, 2, 3], the simulated and the closed-form approximated curves almost have the same values in all SNR regions, which means that the approximation is quite tight
Simulation results show that the closed-form approximation of the ergodic secrecy rate as well as the theoretical bit error rate (BER) results coincide with the simulation results well
Summary
Multiple-input multiple-output (MIMO) systems have been widely used in the wireless networks. Index modulation (IM), which conveys additional information bits through the building blocks of a MIMO system, provides a better tradeoff between the spectral efficiency and energy efficiency. As a recently proposed IM scheme, Media-based modulation (MBM) utilizes radiation patterns of a reconfigurable antenna to convey information. By changing the radio frequency characteristics around the transmit antenna (TA), and conveys additional information through these different channel states [2]. The RF mirrors placed around the transmit antenna generate disturbances by changing the ON/OFF status of the mirrors, which is called mirror activation pattern (MAP). The spectral efficiency of the MBM system is linearly related to the number of RF mirrors, while the spectral efficiency of the widely used spatial modulation (SM) increases more than logarithmically and less than linearly in the number of the transmit antennas. Gao et al.: Anti-Eavesdropping Scheme Based on Random Mapping for GSM-MBM Systems
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