Abstract
In this paper, a transmission scheme based on polarization filtering and weighted fractional Fourier transform (PF-WFRFT) is proposed to enhance the transmission security in wireless communications. Indeed, the distribution of the transmit signals processed by WFRFT can be close to Gaussian, which can significantly improve the low detection probability. However, through scanning the WFRFT order with small step size, an eavesdropper can restore a regular constellation and crack the information. To overcome the problem, in the PF-WFRFT scheme, two polarized signals with mutually orthogonal polarization state are utilized to convey the information, which are processed by WFRFT separately and added up linearly before being transmitted by dual-polarized antennas. In this manner, even by scanning the WFRFT order, recovered signals are composite ones, which make the WFRFT order and the signals’ PSs difficult to crack, thus improving the security. In addition, the polarization-dependent loss (PDL) effect on the proposed scheme is discussed and a proprocessing matrix based on the channel information is constructed to eliminate this effect. Finally, numerical results are given to demonstrate the security performance of the proposed scheme in wireless communications.
Highlights
Nowadays, wireless communication is integrated into all aspects of our lives and is becoming increasingly important
It is better to consider the usage of dual-polarized antennas, which has the potential to double the spectrum efficiency through providing two independent channels in the same frequency, called orthogonal polarization multiplexing (OPM) [2]
The mutual information between orthogonal polarization antennas can be utilized for information transmission, like polarization state modulation (PM) [3] and polarization filtering (PF)
Summary
Wireless communication is integrated into all aspects of our lives and is becoming increasingly important. En, at the receiver side, based on PF, two polarized signals are completely separated for demodulation, improving the transmission efficiency. To further improve the security performance of information transmission, a transmission scheme based on polarization filtering and weighted fractional Fourier transform (PF-WFRFT) is proposed, where the information is divided into two parts and modulated into two sets of symbols with the same number by modulation techniques, like Phase Shift Keying (PSK), Pulse Amplitude Modulation (PAM), and Quadrature Amplitude Modulation (QAM). Is is called polarization dependent loss effect (PDL) To solve this problem, a preprocessing matrix based on the channel state information is constructed to process the received signals at the receiver side.
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