期刊
IEEE TRANSACTIONS ON COMMUNICATIONS
卷 70, 期 4, 页码 2635-2647出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCOMM.2022.3151341
关键词
Security; Channel estimation; Peak to average power ratio; Bit error rate; Transmitting antennas; Communication system security; Radio transmitters; Data security; pilot security; PHY security; minimum-phase all-pass decomposition; MIMO-OFDM
资金
- Scientific and Technological Research Council of Turkey (TUBITAK) [120C142]
- Gebze, Turkey
Novel physical layer security schemes are proposed for securing data and pilots in MIMO systems, utilizing adaptive and flexible algorithms to protect both simultaneously. By exploiting minimum-phase all-pass channel decomposition, the proposed algorithms provide security without compromising legitimate user performance. Analysis on data security and pilot security demonstrate the effectiveness of the algorithms in enhancing communication secrecy.
In this work, novel physical layer security (PLS) schemes are proposed for orthogonal frequency-division multiplexing (OFDM) to secure both data and pilots in multiple-input multiple-output (MIMO) systems. The majority of previous studies focus on only securing the data without considering the security of the pilots used for channel estimation. However, the leakage of channel state information (CSI) from a legitimate node to an eavesdropper allows the latter to acquire knowledge about the channel of the legitimate nodes. To this end, we propose adaptive and flexible PLS algorithms which can 1) secure data, 2) secure pilots, and 3) jointly secure both data and pilots. Particularly, minimum-phase all-pass channel decomposition is exploited, where the proposed algorithms use the all-pass component to provide security without harming the performance of the legitimate user. In the analysis for data security, we evaluate the secrecy under correlated and uncorrelated eavesdropping channels via closed-form bit error rate (BER) formulas. For pilot security, we analyze the estimated channel's normalized mean squared error (NMSE) performance. The simulation results and theoretical analysis demonstrate that the proposed algorithms can effectively enhance the communication secrecy of the overall system.
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