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IEEE International Conference on Communication Software and Networks

Wireless physical layer security based on channel pre-compensation for PolSK modulated systems

Lili Liang, Wei Dong, Min Li

Published May 1, 2017• 9 citations
Publisher

Abstract

A novel physical layer security scheme based on channel pre-compensation is proposed to enhance the communication security in Polarization Shift Keying (PolSK) modulated systems. By using channel pre-compensation, which is performed based on the knowledge of channel, the original signal constellation is distorted, so that only intended receiver can recover. The proposed scheme makes the estimation of the constellation difficult for the adversary. The security and efficiency performance of the proposed scheme are analyzed via simulations.

DOI
10.1109/iccsn.2017.8230135

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A novel physical layer security scheme based on channel pre-compensation is proposed to enhance the communication security in Polarization Shift Keying (PolSK) modulated systems. By using channel pre-compensation, which is performed based on the knowledge of channel, the original signal constellation is distorted, so that only intended receiver can recover. The proposed scheme makes the estimation of the constellation difficult for the adversary. The security and efficiency performance of the proposed scheme are analyzed via simulations.
In this paper we propose a scheme that provides physical layer security by combining two techniques known as encryption and channel pre-compensation. Encryption transforms the original signal constellation into a higher order constellation based on the key sequence generated by AES in counter-mode. Channel pre-compensation is performed based on the knowledge of channel, which is location specific, at the transmitter. These two techniques distort the original signal constellation which can only be recovered by the intended receiver. The proposed scheme not only makes the estimation of the constellation difficult but also the type of modulation that is used for the adversary. BER (bit error rate) is used as performance metric. We find that the adversary suffers from high BER as compared to the legitimate user; hence providing secure communication.
In this paper, a hybrid scheme to provide wireless physical layer security based on encryption and wireless channel pre-compensation is presented. The physical layer security is provided by converting the signal constellation into a higher order constellation by using conventional encryption (symmetric key encryption) and then using channel state information (i.e. amplitude and phase variation), which is location specific, to further encrypt the constellation before transmission. Since detection and demodulation are based upon the known signal constellation, which is not known in advance in our case, it becomes difficult for the eavesdropper to determine the original signal constellation. The data intercepted by the eavesdropper is unintelligible due to the combined effect of encryption and pre-compensation. Using bit error rate (BER) as performance metric, it is found that the eavesdropper suffers from high BER as compared to its legitimate counterpart hence providing secure communication. The developed scheme was tested with existing wireless communication standard IEEE 802.11 to show the practical application of the scheme.
A Polarization state Modulation based Physical Layer Security (PM-PLS) scheme is proposed to enhance the physical layer security of the wireless communication system. Such scheme uses the normal communication signal as the carrier, and conceals the confidential information in the carrier's polarization state. Moreover, utilizing the polarized channel differentia, the eavesdropper's channel quality can be severely worsened. Therefore, through PM-PLS scheme, both anti-detection and modulation information protection can be achieved. Furthermore, based on the proposed polarization constellation structure and polarization constellation encryption method, the depolarization effect caused impact to the desired receiver and eavesdropper are respectively analyzed. Finally, the simulations and experiments based on GNU Radio software platform are carried out to verify the security and efficiency of the proposed PM-PLS scheme.
This paper proposes a new channel state based secure wireless communication mechanism to realize secure communication with a pre-equalization function in a physical layer. Researches of physical layer security have been proposed to achieve secure communication in physical layers. On the contrary, there are a few issues where terminals in a same direction can receive a message, overhead due to complex control mechanisms, special hardware, etc. This paper focusses on practical wireless communication environment, where multi-path signals are received at a receiver. It is common knowledge that a channel state according to multi-path signals is different when a position of a receiver is different. The transmitter of proposed scheme transmits an optimized signal to a receiver with pre-equalizing the signal according to the channel state between the transmitter and the receiver. Therefore, only the receiver that has the same channel state for the pre-equalizing can obtain the high quality signal from the transmitter, and can demodulate the signal correctly. As a result, eavesdroppers around the transmitter cannot equalize the received signal before a demodulation process for the received signal because they exist at a different place of the receiver. The numerical results show that the proposed scheme can realize secure communication in typical wireless channel models. It means that a legitimate receiver can demodulate a signal correctly and eavesdroppers suffer from demodulation errors. As a result, we can find that the proposed scheme can utilize a channel state as an encryption key in physical layer security communication.
In this paper we consider the problem of secure communication between two nodes, over a fading wireless medium, in the presence of a passive eavesdropper. We propose a scheme that provides security based on transforming the basic signal constellation to a higher order signal constellation with the help of conventional encryption method and then using channel knowledge (i.e. amplitude and phase variation), which is location specific, to distort the constellation of encrypted data. This scheme not only makes the estimation of the constellation difficult but also the type of modulation that is used for the adversary. BER (bit error rate) is used as performance metric. We find that the adversary suffers from high BER as compared to its legitimate counterpart.
Improving confidentiality is a main concern in most wireless transmission systems. Traditionally, confidentiality is guaranteed by means of encryption, where transmitted data are encrypted prior to transmission and only the intended receiver(s) can decrypt them. However, encryption/decryption process involves high complexity and heavy signaling in the key distribution/agreement protocols. Thus, aiming toward overcoming complexity, physical-layer security has been proposed as a promising candidate to improve confidentiality against eavesdroppers by exploiting physical-layer techniques. In this paper, we propose a physical-layer security scheme that adapts the modulation type based on the channel phase in order to secure the transmitted data. Moreover, the phase of the transmitted signal is adjusted in order to improve the immunity against eavesdroppers. The proposed scheme has been designed to achieve high robustness against channel estimation errors. The performance of the proposed scheme is evaluated through analysis and simulations in order to demonstrate the significant improvement in the confidentiality.