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International Conference on Computational and Information Sciences

Improving the Secrecy Rate via Combining the Artificial Noise with the Masked Beamforming Scheme

Fangbiao Li, Zhi Xue, Yongkai Zhou, Liang Pang

Published Jun 1, 2013• 0 citations
Publisher

Abstract

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.

DOI
10.1109/iccis.2013.76

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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.
This study investigates how to quantize the masked beamforming systems to maximize the secrecy rate for MISOSE (multiple-input, single-output, single-eavesdropper) channels and assume that this eavesdropper equipped with only single antenna, where only partial channel state information (CSI) at the legitimate receiver is available to the transmitter. In this case, the artificial noise (AN) leaks to the legitimate receiver due to CSI quantization. In the literature, all quantization bits are used to quantize the beamforming vector. Then the null space of this quantized beamforming vector is used to transmit the AN. We find that such quantization schemes can result in serious interference at the legitimate receiver. To overcome this issue, we propose that the beamforming vector and the AN vector should be quantized separately, where the beamforming vector should be selected from a codebook to maximize the beamforming gain and the AN vector should be selected from another codebook to minimize the leakage (or interference). Theoretical results show that separate quantization can significantly reduce the AN leakage at the legitimate receiver. Furthermore, based on the proposed quantization scheme, we show how to allocate bits to separately quantize the beamforming vector and the AN vector to maximize the secrecy rate. By using the proposed quantization and bit allocation schemes, the secrecy rates of masked beamforming systems can be improved compared to the conventional quantization schemes. Simulation results corroborate the theoretical results.
This paper studies a secure communication over multiple-input multiple-output multi-antenna eavesdropper (MIMOME) channels which consist of legitimate parities, namely a transmitter and receiver, equipped with multi-antennas and a passive eavesdropper with multi-antennas. For securing the communication between the legitimate parties, we consider an artificial noise (AN) scheme in which the legitimate transmitter sends its secret messages and AN signal together. Meanwhile, it is assumed that the legitimate receiver has a full-duplex capability which enables it to capture the secret message from the transmitter and simultaneously generate a jamming signal to strengthen security. While there have been studies on similar setups, most of them focus on the design of the jamming signal with the assumption of full channel-state information (CSI) and/or system parameter optimization based on numerical evaluations. On the contrary, in this work, we instead introduce a tight lower bound on an achievable ergodic secrecy rate as a versatile analytic tool and derive a closed-form expressions for the bound. To confirm the analytic results, we carry out numerical evaluations of the ergodic secrecy rate which are compared with the proposed lower bound.
We propose an artificial-noise (AN)-aided transmission scheme to achieve two objectives: 1) energize a single-antenna legitimate transmitter (Alice) by receiving an AN signal from a multi-antenna base-station (Bob) and 2) secure the information signal transmitted from Alice to Bob from eavesdropping by a multi-antenna eavesdropper (Eve). We assume a two-phase transmission scheme. In the first phase, Bob transmits two orthogonal precoded AN vectors to power Alice and confuse Eve. In the second phase, Alice transmits her information signal to Bob along with an amplified version of the AN signal to confuse Eve. Our numerical results show that the proposed scheme can efficiently power Alice while securing her transmissions. Moreover, we show that the achieved average secrecy rate under the proposed scheme outperforms the case when the conventional communication scheme is employed.
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.
In order to avoid eavesdropping, beamforming can be used not only to induce artificial noise or jamming signal to an eavesdropper, but also transmit desired signals to a legitimate user (or sensor) from an access point (AP) equipped with an antenna array. In this paper, with proper power allocation, we show that beamforming under a rich scattering environment can guarantee a certain secrecy rate with an overwhelming probability. This approach becomes attractive for slow fading channels where the ergodic secrecy rate cannot be used to decide a target secrecy rate.