Secure Transmission for Hierarchical Information Accessibility in Downlink MU-MIMO
Kanguk Lee, Jinseok Choi, Dong Ku Kim, and Jeonghun Park

TL;DR
This paper introduces a hierarchical information accessibility model for physical layer security in downlink MU-MIMO systems, formulating a sum secrecy rate maximization problem and proposing a novel eigenvalue-based solution method.
Contribution
It formulates a new HIA model for physical layer security, approximates the non-smooth problem, and develops the GPI-HIA algorithm for improved secrecy rate performance.
Findings
GPI-HIA outperforms baseline methods in simulations
The eigenvalue problem approach effectively finds local optima
The model enhances security in hierarchical user access scenarios
Abstract
Physical layer security is a useful tool to prevent confidential information from wiretapping. In this paper, we consider a generalized model of conventional physical layer security, referred to as hierarchical information accessibility (HIA). A main feature of the HIA model is that a network has a hierarchy in information accessibility, wherein decoding feasibility is determined by a priority of users. Under this HIA model, we formulate a sum secrecy rate maximization problem with regard to precoding vectors. This problem is challenging since multiple non-smooth functions are involved into the secrecy rate to fulfill the HIA conditions and also the problem is non-convex. To address the challenges, we approximate the minimum function by using the LogSumExp technique, thereafter obtain the first-order optimality condition. One key observation is that the derived condition is cast as a…
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Taxonomy
TopicsWireless Communication Security Techniques · Energy Harvesting in Wireless Networks · Cooperative Communication and Network Coding
