Secure Physical Layer Communications in Multi-Antenna Wireless Systems

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Signal Processing Approaches to Secure Physical Layer Communications in Multi-Antenna Wireless Systems by Y.-W. Peter Hong
2014| ISBN 978-981-4560-13-9 | 142 pages pages | PDF| 3.63 MB


Physical layer secrecy has received much attention in recent years, especially in
wireless communications, due to the rapidly increasing data traffic and high
demand for ubiquitous connectivity. Different from conventional cryptographic
approaches used to address wireless security issues, physical layer secrecy utilizes
channel coding and signal processing techniques to communicate secret messages
between the source and the destination while maintaining confidentiality against
the eavesdropper. These studies originate from the information theory literature,
where the focus is often to determine the existence of channel codes that can
achieve this task or to derive the fundamental limit on the maximum code rate that
can be applied reliably under the secrecy constraint (i.e., the secrecy capacity). In
particular, information-theoretic results have shown that the secrecy capacity
increases with the difference between the reception quality at the destination and
that at the eavesdropper. Motivated by this result, signal processing approaches
have been developed in both the data transmission and channel estimation phases
to maximize the signal quality difference between the destination and the eavesdropper.
In general, both coding and signal processing aspects of the problem must
be taken into consideration in order to achieve the secrecy capacity. However,
when the optimal joint design is unknown, signal processing techniques can also
be used to help increase the achievable secrecy rate or reduce the complexity of the
channel coding operations. These approaches are especially interesting in multiantenna
wireless systems, where the spatial degrees of freedom can be exploited to
further enhance secrecy.

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