Abstract
Current wireless communication systems employ Multi-Input, Multi-Output (MIMO) techniques to increase spectral efficiency, at the cost of higher hardware complexity. Most of these systems continue to employ traditional Orthogonal Multiple Access (OMA) schemes, which are suboptimal when compared to Non-Orthogonal Multiple Access (NOMA) schemes. By combining NOMA with MIMO, it is possible to achieve higher spectral efficiencies. However, security in NOMA-MIMO systems remains a problem. In this paper, we study the physical layer security issues of a power based NOMA-MIMO system with a Singular Value Decomposition (SVD) scheme, employed along with Single Carrier with Frequency Domain Equalization (SC-FDE) techniques. We consider a scenario where there is an unintended eavesdropper attempting to listen to the messages being exchanged. It is shown that the higher the channel estimate correlation between transmitter and receiver, the higher the secrecy rate, particularly for a scenario where there is a Line-Of-Sight (LOS) between all users. Therefore, power based NOMA MIMO-SVD schemes, combined with SC-FDE, can be considered efficient options for highly secure MIMO communications.
Highlights
The increasing requirements for telecommunication systems have led to the research of Multiple-Input, Multiple-Output (MIMO) techniques, due to their large capacity gains over traditional single antenna system techniques [1]
In traditional Orthogonal Multiple Access (OMA) systems, radio resources are allocated to users in an orthogonal fashion (OFDMA, orthogonal CDMA, etc.), that is the uncoded messages meant for different users are never superimposed in the time and frequency domains
Our analysis focused on the achievable secrecy rate for various levels and sources of channel errors and different system considerations, as well as on the BER at the users B and C
Summary
The increasing requirements for telecommunication systems have led to the research of Multiple-Input, Multiple-Output (MIMO) techniques, due to their large capacity gains over traditional single antenna system techniques [1]. In traditional Orthogonal Multiple Access (OMA) systems, radio resources are allocated to users in an orthogonal fashion (OFDMA, orthogonal CDMA, etc.), that is the uncoded messages meant for different users are never superimposed in the time and frequency domains. These systems, ideally, have no inter-user interference and require no additional processing for separating user’s at the receiver. In a NOMA scheme, two or more users’ messages are superimposed in the time and frequency domains, and user separation can be made in the power
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