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International Conference on Information Networking

A study on stream assignment method for secure MIMO communication

S. Shimosaka, Kenta Umebayashi, Yasuo Suzuki

Published Jan 1, 2013• 0 citations

Abstract

In this paper, a secure multiple-input multiple-output (MIMO) communication technique based on the singular value decomposition (SVD) is investigated. In a previous work, it has been shown that a secure MIMO communication based on the SVD, where interference signal and confidential signal are assigned to two different streams, can achieve positive secrecy rate. In this investigation, it was assumed that the stream assignment information is available at both the legitimate receiver and the eavesdropper. In fact, random stream assignment has a potential to increase the secrecy rate. Specifically, pilot signal is inserted into the pilot time frame and this is used to inform the stream assignment. If either the legitimate receiver or the eavesdropper decodes the pilot signal incorrectly, the receiver attempts to decode the interference signal in the following data time frame even if there is no information about the confidential signal. Therefore, we propose a signaling technique to expand the difference in mutual information between the legitimate receiver and the eavesdropper which leads to enhanced secrecy. In the proposed signaling technique, correlation between pilot signals in successive pilot time frames is provided. Due to this correlation, correct pilot signal decoding in the current pilot time frame requires the correct pilot signal decoding in the previous pilot time frame. Numerical result shows that the propose method can significantly decrease the mutual information between the transmitter and the eavesdropper which leads to increased the secrecy rate.

DOI: 10.1109/icoin.2013.6496344

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We consider a problem of secure communications for the communication system consisting of multiple inputs for a source and a relay and multiple outputs for the relay, a destination and an eavesdropper. For the above-mentioned communication system, we establish a lower bound on the secrecy capacity at which secure communications between the source and the destination are attainable. We make use of the singular value decomposition (SVD) and its generalization to decompose the whole system into parallel independent channels. At the source, the generalized singular value decomposition (GSVD) is performed to simultaneously diagonalize the channel matrices of the relay and the destination and independently code across the resulting parallel channels. At the relay, the SVD is performed to beamform the signal towards the destination. The scalar case of what we are considering in this article has been investigated in previous literature, to prove that the introduction of a fourth party, the relay, in the wire-tap channel facilitates secure wireless communications. Our simulation results are in line with the scalar case’s and prove to be successful in achieving secrecy capacity where the conventional model failed, i.e., when no relay is introduced and the eavesdropper’s channel incurs as little noise as the legitimate receiver.

Multi-Input, Multi-Output (MIMO) techniques are seeing widespread usage in wireless communication systems due to their large capacity gains. On the other hand, security is a concern of any wireless system, which can make schemes that implement physical layer security key in assuring secure communications. In this paper, we study the physical layer security issues of MIMO with Singular Value Decomposition (SVD) schemes, employed along with Single-Carrier with Frequency-Domain Equalization (SC-FDE) techniques. More concretely. the security potential against an unintended eavesdropper is analysed, and it is shown that the higher the distance between the eavesdropper and the transmitter or receiver, the higher the secrecy rate. In addition, in a scenario where there is Line of Sight (LOS) between all users, it is shown that the secrecy rate can be even higher than in the previous scenario. Therefore, MIMO-SVD schemes combined with SC-FDE can be an efficient option for highly secure MIMO communications.

We study the problem of maximizing the secrecy capacity in multiple input multiple output (MIMO) communication systems in the presence of an eavesdropper using optimal power allocation. One of the key bottlenecks arise in identifying the appropriate spatial streams to securely transmit data and the corresponding transmit powers to maximize capacity. We employ the generalized singular value decomposition (GSVD) technique to identify these spatial streams and propose a power allocation scheme over these spatial streams. We also present an upper bound for the maximum achievable secrecy rate under certain conditions. We show that the proposed power allocation technique not only achieves better secrecy, but also converges to the upper bound faster than those in the literature.

Secure communications in a multiple input multiple output (MIMO) system in which the eavesdropper's channel is inherently superior to that of the legitimate receiver is described. Both the legitimate receiver and the eavesdropper are assumed to have equal knowledge and comparable computational capabilities and there is no "secret key" known only to the legitimate receiver. The combination of artificial noise added at the transmitter, parallelization of the legitimate channel using the singular value decomposition, and low density parity check (LDPC) codes can overcome the superiority of the eavesdropper's channel and enable secure communications. The effectiveness of the method is greater for larger numbers of antennas and larger modulation constellations.