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Physical Communication

NOMA and massive MIMO assisted physical layer security using artificial noise precoding

Pooja Singh, Aditya Trivedi

Published Dec 24, 2019• 19 citations
Publisher
DOI
10.1016/j.phycom.2019.100977

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Secure Communication in Relay-Assisted Massive MIMO Downlink

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In this paper, secure transmission strategies for the relay-assisted massive multiple-input multiple-output (MIMO) downlink are investigated by using artificial noise (AN) generation and by exploiting the excess degrees-of-freedom through the random and null-space based precoders. The achievable rate expressions are derived for the estimated channel state information, and hence, the detrimental effects of channel estimation errors in designing precoders are quantified. Specifically, the achievable secrecy rate at the relayed user nodes is derived in closed-form, and thereby, the performance gap between the random and null-space based precoders is investigated. Our performance analysis reveals that the AN generation by using random precoders can be employed to design secure physical layer transmission strategies for the relay-assisted massive MIMO downlink systems. The AN generation can be useful in the finite antenna regime for guaranteeing physical layer security in the base-station-to-relay hop of the relay-assisted massive MIMO downlink. Although the AN generated at the base-station propagates to the relay-to-user hop via amplify-and-forward operation at the relay, sophisticated security provisions are needed to secure the end-to-end transmission when the relay is equipped with finitely many antennas. Consequently, the performance gap between the random and null-space based precoders gradually diminishes in the limit of infinitely many base-station antennas. Nevertheless, the achievable secrecy rate steadily vanishes with an increasing number of antennas at the passive eavesdropper.

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Research on relay-based physical layer security based on massive MIMO

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The security of traditional wireless communication relies on upper layer encryption and cannot protect the security of the physical layer. In order to overcome the shortcomings of traditional wireless communication system encryption, artificial noise generation and random precoder are used to study the secure transmission method of large-scale multiple input multiple output(MIMO) downlink system under relay cooperation. The estimated channel state information is derived and the rate expression is derived,and then the confidentiality rate on the user node is analyzed. The performance gap is analyzed and compared for the minimum mean square error precoder(MMSE) and zero forcing(ZF) precoder at the base station. Theoretical analysis and simulation results show that this method can design a secure physical layer transmission strategy for large-scale MIMO relay systems, and the MMSE precoder exhibits better security performance than the ZF precoder.

•May 1, 2019•0 citations
In this paper, secure transmission strategies for the relay-assisted massive multiple-input multiple-output (MIMO) downlink are investigated by using artificial noise (AN) generation and by exploiting the excess degrees-of-freedom through the random and null-space based precoders. The achievable rate expressions are derived for the estimated channel state information, and hence, the detrimental effects of channel estimation errors in designing precoders are quantified. Specifically, the achievable secrecy rate at the relayed user nodes is derived in closed-form, and thereby, the performance gap between the random and null-space based precoders is investigated. Our performance analysis reveals that the AN generation by using random precoders can be employed to design secure physical layer transmission strategies for the relay-assisted massive MIMO downlink systems. The AN generation can be useful in the finite antenna regime for guaranteeing physical layer security in the base-station-to-relay hop of the relay-assisted massive MIMO downlink. Although the AN generated at the base-station propagates to the relay-to-user hop via amplify-and-forward operation at the relay, sophisticated security provisions are needed to secure the end-to-end transmission when the relay is equipped with finitely many antennas. Consequently, the performance gap between the random and null-space based precoders gradually diminishes in the limit of infinitely many base-station antennas. Nevertheless, the achievable secrecy rate steadily vanishes with an increasing number of antennas at the passive eavesdropper.
The security of traditional wireless communication relies on upper layer encryption and cannot protect the security of the physical layer. In order to overcome the shortcomings of traditional wireless communication system encryption, artificial noise generation and random precoder are used to study the secure transmission method of large-scale multiple input multiple output(MIMO) downlink system under relay cooperation. The estimated channel state information is derived and the rate expression is derived,and then the confidentiality rate on the user node is analyzed. The performance gap is analyzed and compared for the minimum mean square error precoder(MMSE) and zero forcing(ZF) precoder at the base station. Theoretical analysis and simulation results show that this method can design a secure physical layer transmission strategy for large-scale MIMO relay systems, and the MMSE precoder exhibits better security performance than the ZF precoder.