Transceiver Design for Full-Duplex UAV Based Zero-Padded OFDM System With Physical Layer Security

Abstract

In this paper, multi-antenna transceiver for zero-padded orthogonal frequency division multiplexing (OFDM) system is designed at mmWave by integrating full-duplex unmanned aerial vehicle (UAV) into the terrestrial cellular networks. Assuming that there exist no direct communication links between the ground base station (GBS) and the mobile users due to unexpected blockages from high storied buildings in urban area, the UAV applies decode-and-forward cooperative strategy on the received OFDM signals transmitted from GBS and re-transmits to the ground mobile users and passive eavesdropper. In this proposed system, intertwining logistic map (ILM)-cosine transform aided encryption algorithm combined with artificial noise enhancing physical layer security (PLS) is introduced. Also walsh-hadamard transform technique integrated with QR-decomposition based zero forcing (ZF) block diagonalization (QR-ZF-BD) precoding for multi-user interference reduction and non-iterative clipping and filtering technique for peak to average power ratio (PAPR) reduction are utilized. In addition, Low density parity check (LDPC) and repeat and accumulate (RA) channel coding with cholesky decomposition based ZF and minimum mean square error signal detection schemes for improved bit error rate (BER) are also introduced. Numerical results demonstrate the effectiveness of the proposed system in terms of PLS for color image transmission at high order digital modulation . At the complementary cumulative distribution function of probability level 1-6%, the estimated PAPR is found to have value of 6 dB.The three users achieve BER = 1 × 10 −4 at signal-to-noise ratio of 1.5 dB, 4 dB and 6 dB under RA channel coding and 16-QAM digital modulation.INDEX TERMS Bit error rate, channel coding, peak to average power ratio, physical layer security encryption, signal-to-noise ratio, zero-padded orthogonal frequency division multiplexing.

UAV-Aided Transceiver Design for Secure Downlink OW-DFTs-OFDM System: A Multi-User mmWave Application

“…The total computational complexity of the proposed system is O(ϑ LLCS + ϑ OVSF + ϑ DFT + ϑ IFFT + ϑ OW −DFTs−OFDM ). According to [15], the total computational complexity is O(ϑ ILM + ϑ WHT (User) + ϑ WHT (Eave) + ϑ PAPR(User) + ϑ PAPR(Eave) + ϑ IDFT (User) + ϑ IDFT (Eave) ), where ϑ ILM represents the complexity of interwining logistic map (ILM)-cosine transform, ϑ WHT (User) represents the complexity of walsh-hadamard transform (WHT) of legitimate user, ϑ WHT (Eave) represents the complexity of WHT of ED, ϑ PAPR(User) represents the complexity of PAPR of legitimate user, ϑ PAPR(Eave) represents the complexity of PAPR of ED, ϑ IDFT (User) represents the complexity of IDFT of legitimate user, and ϑ IDFT (Eave) represents the complexity of IDFT of ED. So, the proposed system has less computational complexity than the system presented in [15].…”

“…In [14], the authors investigate the operation of multiple UAV-assisted relay and jammers to secure mmWave communication; and derive new closed-form expressions of secrecy outage probability utilizing models of 3D-antenna gain. By incorporating fullduplex UAVs in terrestrial cellular networks, it is possible to achieve multi-antenna transceiver for zero-padded orthogonal frequency division multiplexing (OFDM) systems [15].…”

Security Threats and Mitigation Techniques in UAV Communications: A Comprehensive Survey

“…Several research works [94], [95], [96], [97], [98], [99], [100], [101], [102], [103], [104], [105], [106], [107], [108], [109], [110], summarized in Table 6, have emphasized the need to employ AN to secure communication at the physical layer. Specifically, the authors in [94] have investigated a wiretap channel where a reliable network was established between the multi-antenna transmitters and a single-antenna UE relay node.…”

“…The desired user is guaranteed to be within the satellite's transmitted signal beam to improve the QoS. Further, zero-padded OFDM system-aided multi-antenna transceivers for mmWave are considered in [107] by integrating FD UAVs with ground cellular networks in the presence of a passive eavesdropper. An intertwining logistic map-cosine transformassisted algorithm and AN are utilized to enhance PHY security.…”

Gyre Precoding and T-Transformation-Based GFDM System for UAV-Aided mMTC Network

“…Even in an emergency situation when terrestrial mobile stations go through unexpected discontinuity due to disasters, UAVs can be utilized as a base station (BS) or as a relay station (RS). Due to flexible deployment and cost effectiveness, full-duplex UAVs can also be integrated with terrestrial cellular networks [4]. A typical scenario is illustrated in Figure 1, where UAVs are forming a cooperative relay network with an assumption that there is no direct connection between BS and user equipment (UE).…”