Two High-performance Schemes of Transmit Antenna Selection for Secure Spatial Modulation

TL;DR

This paper proposes two high-performance transmit antenna selection schemes for secure spatial modulation systems with artificial noise, balancing secrecy rate and complexity, and introduces a generalized Euclidean distance-optimized method.

Contribution

It introduces leakage-based and Max-SR antenna selection schemes, along with a generalized EDAS method, enhancing secrecy rate performance with different complexity levels.

Findings

Max-SR achieves highest secrecy rate but with high complexity.

Leakage-based method offers near-Max-SR performance with lower complexity.

Generalized EDAS balances secrecy rate and complexity effectively.

Abstract

In this paper, a secure spatial modulation (SM) system with artificial noise (AN)-aided is investigated. To achieve higher secrecy rate (SR) in such a system, two high-performance schemes of transmit antenna selection (TAS), leakage-based and maximum secrecy rate (Max-SR), are proposed and a generalized Euclidean distance-optimized antenna selection (EDAS) method is designed. From simulation results and analysis, the four TAS schemes have an decreasing order: Max-SR, leakage-based, generalized EDAS, and random (conventional), in terms of SR performance. However, the proposed Max-SR method requires the exhaustive search to achieve the optimal SR performance, thus its complexity is extremely high as the number of antennas tends to medium and large scale. The proposed leakage-based method approaches the Max-SR method with much lower complexity. Thus, it achieves a good balance between complexity and SR performance. In terms of bit error rate (BER), their performances are in an increasing order: random, leakage-based, Max-SR, and generalized EDAS.