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IEEE Globecom Workshops (GC Wkshps)

Semi-Adaptive Transmission in Slow Fading MISOME Wiretap Channels

Zongmian Li, Pengcheng Mu, Zongze Li, Xiaoyan Hu, Hui‐Ming Wang

Published Dec 1, 2015• 0 citations
Publisher

Abstract

The design of artificial-noise-aided secure transmission over multiple-input, single-output, and multi-antenna eavesdropper (MISOME) slow fading channels is addressed in this paper. We consider the scenario where the messages sent by N-antenna transmitter are overheard by a K-antenna eavesdropper. The instantaneous channel state information of the eavesdropper's channel is assumed to be unknown to the transmitter, and we use the secrecy outage probability as the security metric. Differing from the well-known adaptive and non- adaptive schemes, we consider the newly proposed semi-adaptive (S-ADP) scheme, in which the communication rate is fixed and the secrecy rate is adaptively adjusted. By fixing the communication rate, the codebook can be fixed, thus the encoder and decoder designs are both simplified. The communication rate is assumed to be predefined as in many practical scenarios, and we maximize the secrecy rate under reliability and secrecy constraints. Simulation results show that the S-ADP scheme can achieve satisfactory performance.

DOI
10.1109/glocomw.2015.7414167

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The design of artificial-noise-aided secure transmission over multiple-input, single-output, and multi-antenna eavesdropper (MISOME) slow fading channels is addressed in this paper. We consider the scenario where the messages sent by N-antenna transmitter are overheard by a K-antenna eavesdropper. The instantaneous channel state information of the eavesdropper's channel is assumed to be unknown to the transmitter, and we use the secrecy outage probability as the security metric. Differing from the well-known adaptive and non- adaptive schemes, we consider the newly proposed semi-adaptive (S-ADP) scheme, in which the communication rate is fixed and the secrecy rate is adaptively adjusted. By fixing the communication rate, the codebook can be fixed, thus the encoder and decoder designs are both simplified. The communication rate is assumed to be predefined as in many practical scenarios, and we maximize the secrecy rate under reliability and secrecy constraints. Simulation results show that the S-ADP scheme can achieve satisfactory performance.
This paper studies the design of artificial-noise-aided (AN-aided) secure transmission in slow-fading multiple-input–single-output (MISO) channels. We consider the scenario where a multiantenna transmitter sends messages to a single-antenna legitimate receiver in the presence of multiple noncolluding single-antenna eavesdroppers. It is assumed that the transmitter possesses instantaneous channel state information (CSI) of the legitimate channel but only the statistics of the eavesdropper's channels. Instead of adopting the well-known adaptive and nonadaptive transmission schemes, we consider the newly proposed semiadaptive scheme, in which the communication rate is fixed, and the secrecy rate is adaptively adjusted according to the legitimate channel's CSI. Compared with the adaptive scheme, a major advantage of fixing the communication rate is that the codebook can be fixed, and thus, the encoder and decoder designs are both simplified. We consider a generalized AN-aided beamforming structure, which allows arbitrary beamforming direction. Specifically, we focus on the problem of maximizing the secrecy throughput on the premise of reliable and secure transmission. By solving this problem, the optimal beamforming direction, power-allocation parameters, and secrecy rate are derived in closed form, and the optimal communication rate is obtained numerically. Finally, simulation results are presented to show the performance of the semiadaptive scheme.
In this paper, we investigate the design of artificial-noise-aided secure multi-antenna transmission in slow fading channels. The primary design concerns include the transmit power allocation and the rate parameters of the wiretap code. We consider two scenarios with different complexity levels: 1) the design parameters are chosen to be fixed for all transmissions; and 2) they are adaptively adjusted based on the instantaneous channel feedback from the intended receiver. In both scenarios, we provide explicit design solutions for achieving the maximal throughput subject to a secrecy constraint, given by a maximum allowable secrecy outage probability. We then derive accurate approximations for the maximal throughput in both scenarios in the high signal-to-noise ratio region, and give new insights into the additional power cost for achieving a higher security level while maintaining a specified target throughput. In the end, the throughput gain of adaptive transmission over non-adaptive transmission is also quantified and analyzed.
This paper studies the secure transmission over Rayleigh fading channels, where the communication between a multi-antenna(N-antenna) transmitter and a desired single-antenna receiver is overheard by a multi-antenna(Mantenna) eavesdropper. We consider a practical scenario where the transmitter can only obtain the average channel knowledge of the eavesdropper and the imperfect instantaneous channel knowledge of the legitimate receiver through the use of pilot training and digital feedback. Two outage events occur in the system - a connection outage event to ensure decode correctly and a secrecy outage event to ensure secure transmission, closed-form expressions for dual outage probabilities are derived. Before transmission, the transmitter selects the wiretap coding parameters to achieve secure transmission based on the instantaneous realization of the main channel, and the closed-form expression for secrecy throughput is also derived. By this, we further determine the optimal secrecy rate and the optimal power allocation between information signals and artificial noise signals to maximize the secrecy throughput. Moreover, we explicitly examine the impacts of N and M on the secrecy throughput and optimal power allocation.
This paper studies the secure multiple-antenna transmission in slow fading channels for the cognitive radio network, where a multiple-input, single-output, multieavesdropper (MISOME) primary network coexisting with a multiple-input single-output secondary user (SU) pair. The SU can get the transmission opportunity to achieve its own data traffic by providing the secrecy guarantee for the PU with artificial noise. Different from the existing works, which adopt the instantaneous secrecy rate as the performance metric, with only the statistical channel state information (CSI) of the eavesdroppers, we maximize the secrecy throughput of the PU by designing and optimizing the beamforming, rate parameters of the wiretap code adopted by the PU, and power allocation between the information signal and the artificial noise of the SU, subjected to the secrecy outage constraint at the PU and a throughput constraint at the SU. We propose two design strategies: 1) nonadaptive secure transmission strategy (NASTS) and 2) adaptive secure transmission strategy, which are based on the statistical and instantaneous CSIs of the primary and secondary links, respectively. For both strategies, the exact rate parameters can be optimized through numerical methods. Moreover, we derive an explicit approximation for the optimal rate parameters of the NASTS at high SNR regime. Numerical results are illustrated to show the efficiency of the proposed schemes.
New insights into the role of artificial noise in securing communication in a Gaussian multi-antenna fading wiretap channel are presented. An appropriate secrecy-outage-based optimization framework is developed for the Multiple-Input Single-Output Single-Eavesdropper (MISOSE) case to measure the performance of artificial noise. It is assumed that only the legitimate receiver's instantaneous channel state information and the average statistics of the eavesdropper's channel are available at the transmitter. The optimization is based on maximizing the effective secret-message rate constrained by a given maximum secrecy outage criterion. Under this framework, a fundamental investigation is conducted into whether it is worthwhile for the transmitter to allocate any of its available power for artificial noise. By numerically solving the optimization problem, it is demonstrated that there are: (i) scenarios where artificial noise does indeed give significant gains in the secret-message rate, and (ii) scenarios where any amount of power allocation to artificial noise is wasteful in view of the overall performance.
The use of multiple-antenna arrays can leverage the physical-layer security of wireless systems. It is therefore important to characterize such systems in a realistic situation where we can apply the so-called artificial-noise solution in multiple-antenna systems to enhance the communication confidentiality by only exploiting a fading nature of wireless environments. In this paper, we consider secure communication over a multiple-input single-output Rayleigh-fading channel in the presence of a multiple-antenna eavesdropper-referred to as a multiple-input single-output multiple-eavesdropper (MISOME) wiretap channel. Specifically, secure beamforming with artificial noise is treated when the transmitter has access to full channel state information (CSI) of a legitimate channel but only channel distribution information of an eavesdropper channel. We first put forth a new notion of the symbol error probability (SEP) of confidential information-called the δ-secrecy SEP-to connect the reliability and confidentiality of the legitimate communication. We then quantify the diversity impact of secure beamforming with artificial noise on the δ-secrecy SEP in the MISOME wiretap channel and show that the artificial-noise strategy preserves the secrecy diversity of order nt- nefor nttransmit and neeavesdropper antennas.