3,726 research outputs found
Artificial-Noise-Aided Secure Multi-Antenna Transmission with Limited Feedback
We present an optimized secure multi-antenna transmission approach based on
artificial-noise-aided beamforming, with limited feedback from a desired
single-antenna receiver. To deal with beamformer quantization errors as well as
unknown eavesdropper channel characteristics, our approach is aimed at
maximizing throughput under dual performance constraints - a connection outage
constraint on the desired communication channel and a secrecy outage constraint
to guard against eavesdropping. We propose an adaptive transmission strategy
that judiciously selects the wiretap coding parameters, as well as the power
allocation between the artificial noise and the information signal. This
optimized solution reveals several important differences with respect to
solutions designed previously under the assumption of perfect feedback. We also
investigate the problem of how to most efficiently utilize the feedback bits.
The simulation results indicate that a good design strategy is to use
approximately 20% of these bits to quantize the channel gain information, with
the remainder to quantize the channel direction, and this allocation is largely
insensitive to the secrecy outage constraint imposed. In addition, we find that
8 feedback bits per transmit antenna is sufficient to achieve approximately 90%
of the throughput attainable with perfect feedback.Comment: to appear in IEEE Transactions on Wireless Communication
Artificial-Noise-Aided Secure Transmission Scheme With Limited Training and Feedback Overhead
We design a novel artificial-noise-aided secure onoff
transmission scheme in a wiretap channel. We consider
a practical scenario where the multi-antenna transmitter only
obtains partial channel knowledge from the single-antenna receiver
through limited training and feedback but has no channel
knowledge about the single-antenna eavesdropper. In the design,
we first propose a three-period block transmission protocol to
capture the practical training and quantization features. We
then characterize the statistics of the received signal-to-noise
ratios (SNRs) at the receiver and the eavesdropper. Under the
secrecy outage constraint, we exploit the on-off scheme to perform
secure transmission and derive a closed-form expression for the
secrecy throughput. Moreover, we investigate the optimization
problem of maximizing the secrecy throughput by proposing an
iterative algorithm to determine the optimal power allocation
between the information signal and artificial noise, as well as the
optimal codeword transmission rate. Furthermore, we define the
net secrecy throughput (NST) which takes the signaling overhead
into account and address the problem of optimally allocating the
block resource to the training and feedback overhead. Numerical
results clearly demonstrate how the optimal signaling overhead
changes with the number of transmit antennas, and there exists
an optimal number of antennas that maximizes the NST.ARC Discovery Projects Grant DP15010390
On the Design of Artificial-Noise-Aided Secure Multi-Antenna Transmission in Slow Fading Channels
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: i) the design
parameters are chosen to be fixed for all transmissions, ii) 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, whilst maintaining a specified
target throughput. In the end, the throughput gain of adaptive transmission
over non-adaptive transmission is also quantified and analyzed.Comment: to appear in IEEE Transactions on Vehicular Technolog
Principles of Physical Layer Security in Multiuser Wireless Networks: A Survey
This paper provides a comprehensive review of the domain of physical layer
security in multiuser wireless networks. The essential premise of
physical-layer security is to enable the exchange of confidential messages over
a wireless medium in the presence of unauthorized eavesdroppers without relying
on higher-layer encryption. This can be achieved primarily in two ways: without
the need for a secret key by intelligently designing transmit coding
strategies, or by exploiting the wireless communication medium to develop
secret keys over public channels. The survey begins with an overview of the
foundations dating back to the pioneering work of Shannon and Wyner on
information-theoretic security. We then describe the evolution of secure
transmission strategies from point-to-point channels to multiple-antenna
systems, followed by generalizations to multiuser broadcast, multiple-access,
interference, and relay networks. Secret-key generation and establishment
protocols based on physical layer mechanisms are subsequently covered.
Approaches for secrecy based on channel coding design are then examined, along
with a description of inter-disciplinary approaches based on game theory and
stochastic geometry. The associated problem of physical-layer message
authentication is also introduced briefly. The survey concludes with
observations on potential research directions in this area.Comment: 23 pages, 10 figures, 303 refs. arXiv admin note: text overlap with
arXiv:1303.1609 by other authors. IEEE Communications Surveys and Tutorials,
201
Physical Layer Service Integration in 5G: Potentials and Challenges
High transmission rate and secure communication have been identified as the
key targets that need to be effectively addressed by fifth generation (5G)
wireless systems. In this context, the concept of physical-layer security
becomes attractive, as it can establish perfect security using only the
characteristics of wireless medium. Nonetheless, to further increase the
spectral efficiency, an emerging concept, termed physical-layer service
integration (PHY-SI), has been recognized as an effective means. Its basic idea
is to combine multiple coexisting services, i.e., multicast/broadcast service
and confidential service, into one integral service for one-time transmission
at the transmitter side. This article first provides a tutorial on typical
PHY-SI models. Furthermore, we propose some state-of-the-art solutions to
improve the overall performance of PHY-SI in certain important communication
scenarios. In particular, we highlight the extension of several concepts
borrowed from conventional single-service communications, such as artificial
noise (AN), eigenmode transmission etc., to the scenario of PHY-SI. These
techniques are shown to be effective in the design of reliable and robust
PHY-SI schemes. Finally, several potential research directions are identified
for future work.Comment: 12 pages, 7 figure
Enhancing Secrecy with Multi-Antenna Transmission in Wireless Ad Hoc Networks
We study physical-layer security in wireless ad hoc networks and investigate
two types of multi-antenna transmission schemes for providing secrecy
enhancements. To establish secure transmission against malicious eavesdroppers,
we consider the generation of artificial noise with either sectoring or
beamforming. For both approaches, we provide a statistical characterization and
tradeoff analysis of the outage performance of the legitimate communication and
the eavesdropping links. We then investigate the networkwide secrecy throughput
performance of both schemes in terms of the secrecy transmission capacity, and
study the optimal power allocation between the information signal and the
artificial noise. Our analysis indicates that, under transmit power
optimization, the beamforming scheme outperforms the sectoring scheme, except
for the case where the number of transmit antennas are sufficiently large. Our
study also reveals some interesting differences between the optimal power
allocation for the sectoring and beamforming schemes.Comment: to appear in IEEE Transactions on Information Forensics and Securit
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