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International Conference on Computational and Information Sciences

Research on Secrecy Communication via Bilateral Artificial Noise Transmitting

Yan Mei Zhu, Xiao Chen, Fangbiao Li, Yongkai Zhou, Xinxing Yin, Liang Pang, Zhi Xue

Published Jun 1, 2013• 0 citations
Publisher

Abstract

The problem that we consider is the secrecy communication in bilateral transmitting scenario. The model is connected via wireless signal between two points: the transmitter and the receiver. We assume that the transmitter has a single transmit antenna while the receiver has two (one transmit, one receive). In recent papers, it is shown that artificial noise could be used to increase the secrecy capacity. However, for one transmitter antenna case, helper nodes can only be used. In this paper we propose a new 2-Stage artificial noise sending method to substitute helper nodes. So the cost of helper nodes can be saved. The comparison of artificial noise transmitting with Beamforming is given in this paper. It can be proved to increase the secrecy capacity via our approach.

DOI
10.1109/iccis.2013.65

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The problem that we consider is the secrecy communication in bilateral transmitting scenario. The model is connected via wireless signal between two points: the transmitter and the receiver. We assume that the transmitter has a single transmit antenna while the receiver has two (one transmit, one receive). In recent papers, it is shown that artificial noise could be used to increase the secrecy capacity. However, for one transmitter antenna case, helper nodes can only be used. In this paper we propose a new 2-Stage artificial noise sending method to substitute helper nodes. So the cost of helper nodes can be saved. The comparison of artificial noise transmitting with Beamforming is given in this paper. It can be proved to increase the secrecy capacity via our approach.
Abstract — The problem of secret communication between two nodes over a wireless link is considered, where a passive eavesdropper may overhear the communication. It is desired that the eavesdropper be unable to decode the message. We show that secrecy can be achieved by adding artificially generated noise to the information bearing signal such that it does not degrade the intended receiver’s channel. We consider two different scenarios; one in which the transmitter has multiple transmit antennas and the other in which the transmitter has a single antenna but ‘helper ’ nodes are available. In the multiple antenna scenario, the degrees of freedom provided by the multiple antennas is used to generate noise intelligently so that it degrades only the eavesdropper’s channel. In the multiple helper scenario, even though the transmitter does not have multiple antennas, the helper nodes simulate the effect of multiple antennas and allow the transmitter to generate artificial noise as in the previous case.
The broadcast nature of the wireless medium makes the communication over this medium vulnerable to eavesdropping. This report considers the problem of secret communication between two nodes, over a fading wireless medium, in the presence of a passive eavesdropper. The assumption used is that the transmitter and its helpers (amplifying relays) have more antennas than the eavesdropper. The transmitter ensures secrecy of communication by utilizing some of the available power to produce ‘artificial noise’, such that only the eavesdropper’s channel is degraded. Two scenarios are considered, one where the transmitter has multiple transmit antennas, and the other where amplifying relays simulate the effect of multiple antennas. The channel state information (CSI) is assumed to be publicly known, and hence, the secrecy of communication is independent of the secrecy of CSI.
Secrecy can be achieved on the physical layer in fading channels by smart resource allocation and transmit optimization. In this work, simple helper nodes creating artificial noise are applied to improve the secrecy of a point-to-point link. In the single-antenna case, the channel parameters and SNR determine whether a helper can increase the secrecy capacity. We derive a necessary and sufficient condition for optimality of a helper. The single-antenna helper provides only limited support for the single-antenna link. Therefore, we compute the optimal beamforming vectors of the transmitter in closed form for the multiple antenna link under ideal assumption of perfectly informed transmitters. The optimal beamforming vectors of the helpers are characterized and an algorithm is proposed which jointly optimizes transmitter and helper beamformers. It is shown that with increasing number of helpers the secrecy capacity approaches the capacity of the peaceful multiple-antenna link without secrecy constraints. Finally, numerical simulations illustrate the secrecy capacity gain by these simple helpers.
The broadcast nature of the wireless medium makes the communication over this medium vulnerable to eavesdropping. This paper considers the problem of secret communication between two nodes, over a fading wireless medium, in the presence of a passive eavesdropper. The assumption used is that the transmitter and its helpers (amplifying relays) have more antennas than the eavesdropper. The transmitter ensures secrecy of communication by utilizing some of the available power to produce 'artificial noise', such that only the eavesdropper's channel is degraded. Two scenarios are considered, one where the transmitter has multiple transmit antennas, and the other where amplifying relays simulate the effect of multiple antennas. The channel state information (CSI) is assumed to be publicly known, and hence, the secrecy of communication is independent of the secrecy of CSI.
This paper considers the secure communication via combining the artificial noise with the masked beamforming scheme. In this scenario, the transmitter is equipped with multi-antenna while each of the eavesdroppers is equipped with only one antenna, and the legitimate receiver has a receiving antenna and a transmitting antenna, respectively. The transmitter simultaneously transmits a beamformed secret information-bearing signal to a legitimate receiver and artificial noise (AN) to the eavesdroppers. The legitimate receiver sends the AN to confuse the eavesdropper while receiving the desired signal from the transmitter. We compare the proposed scheme that combining the AN with masked beamforming with no beamforming vector scheme, and derive that the combined strategy obviously improved the secrecy rate.
The paper considers the secure transmission in a wireless environment in which both the transmitter (Alice) and the legitimate receiver (Bob) send artificial noise (AN) to interfere with the eavesdropper (Eve). Optimal design is analyzed in detail for this AN-by-both-side model to deal with Eve’s stochastic channel condition and random spatial distribution. Bipolar-beamforming is first proposed to jointly design Alice and Bob’s transmitting signals. By optimally assigning the transmitting antenna for Bob and allocating the power ratio between Alice’s information and the AN signal, maximum secrecy capacity can be achieved. Simulation is done to illustrate the process of bipolar-beamforming optimization. Results show that the AN-by-both-side model has good secrecy performance on both average and extreme conditions as Eve approaches Alice or Bob.