NDLI: Transmit Antenna Selection for Security Enhancement in MIMO Wiretap Channels

Content Provider	IEEE Xplore Digital Library
Author	Nan Yang Yeoh, P.L. Elkashlan, M. Schober, R. Collings, I.B.
Copyright Year	1972
Abstract	We propose and analyze transmit antenna selection (TAS) to enhance physical layer security in a wiretap channel with N_A antennas at the transmitter, N_B antennas at the receiver, and N_E antennas at the eavesdropper. We focus on the practical scenario where the transmitter does not have any channel state information (CSI) of the eavesdropper's channel. The transmitter selects a single antenna that maximizes the instantaneous signal-to-noise ratio (SNR) at the receiver. The receiver and the eavesdropper employ either maximal-ratio combining (MRC) or selection combining (SC) to combine the received signals. For the proposed protocols, we derive new closed-form expressions for the probability of non-zero secrecy capacity. We consider Nakagami-m fading with non-identical fading parameters of the main channel, m_B, and of the eavesdropper's channel, m_E. Next, we derive new closed-form expressions for the exact secrecy outage probability, based on which the ε-outage secrecy capacity is characterized. Based on the exact expressions, we derive the asymptotic secrecy outage probability which accurately reveals the secrecy diversity order and the secrecy array gain. We confirm that the proposed protocols achieve identical secrecy diversity orders of N_AN_Bm_B. An interesting conclusion is reached that this diversity order is independent of N_E and m_E. Furthermore, we prove that under the proposed protocols, the secrecy outage probability and the ε-outage secrecy capacity improve with increasing N_A.
Starting Page	144
Ending Page	154
Page Count	11
File Size	1147322
File Format	PDF
ISSN	00906778
Volume Number	61
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transmitting antennas Fading Signal to noise ratio Receiving antennas Protocols MIMO Nakagami-m fading physical layer security transmit antenna selection
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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