Securing Wireless MIMO Systems

Abstract

This chapter proposes computationally secure physical layer wireless communication for multiple–input multiple–output (MIMO) systems. The algorithm presented is applicable across various MIMO configurations and resistant to attacks. It relies on accurate knowledge of wireless channel characteristics and channel reciprocity. Both transmitter and legitimate receiver generate a permutation vector based on channel fading paths to create the security key. The vast number of potential combinations makes decryption nearly infeasible. Additionally, secrecy rate analysis is introduced, considering space modulation techniques (SMTs) and spatial multiplexing (SMX) MIMO approaches, evaluating mutual information and average bit error rate (ABER) at both ends. Various SMTs schemes including space shift keying (SSK), spatial modulation (SM), and quadrature spatial modulation (QSM) are examined to validate the derived formulations.