Adaptive Communication Through Exploiting RIS, SSK, and CIM for Improved Reliability and Efficiency

TL;DR

This paper introduces RIS-CIM-TSSK, a novel adaptive wireless communication system combining RIS, SSK, and CIM to enhance reliability, energy efficiency, and adaptability in dynamic environments, with low-complexity detection.

Contribution

It proposes a new integrated system model that leverages RIS, SSK, and CIM, including a low-complexity detector and phase adjustment methods for improved performance.

Findings

Enhanced error rates and reliability demonstrated through simulations.

Reduced system complexity and energy consumption.

Effective adaptation to various antenna and RIS configurations.

Abstract

In this paper, we present a novel communication system model that integrates reconfigurable intelligent surfaces (RIS), spatial shift keying (SSK), and code index modulation (CIM) based on Hadamard coding called RIS based transmit SSK-CIM (RIS-CIM-TSSK). By leveraging RIS, the system adapts rapidly to dynamic environments, enhancing error rates and overall reliability. SSK facilitates the transmission of additional passive information while eliminating the need for multiple radio frequency (RF) chains, thereby reducing complexity. CIM enhances passive information transmission through frequency domain spreading, which may increase signal obfuscation. This proposed scheme not only improves energy efficiency but also offers a robust solution for reliable communication in modern wireless networks, paving the way for smarter and more adaptable implementations. We consider a suboptimal, low-complexity detector for the proposed scheme and also address the blind case for phase adjustment of the RIS. Finally, we present the simulation results for the proposed system model across various configurations, including different numbers of receive and transmit antennas, varying reflecting elements of the RIS, and different code lengths.