Hybrid Reflection Modulation

Reconfigurable intelligent surface (RIS)-empowered communication has emerged as a novel concept for customizing future wireless environments in cost- and energy-efficient way. However, due to double path loss, existing fully passive RIS systems that purely reflect the incident signals into preferred directions attain an unsatisfactory performance improvement over traditional networks certain conditions. To overcome this bottleneck, we propose transmission scheme, named hybrid reflection modulation (HRM), exploiting both active reflecting elements at their combinations, which enables convey information without using any radio frequency (RF) chains. In HRM additional power amplifiers are able amplify incoming signal, while remaining can simply with appropriate phase shifts. Based on model, obtain upper bound average bit error probability (ABEP), derive achievable rate of system theoretic approach. Moreover, comprehensive computer simulations performed prove superiority proposed scheme passive, (RM) systems.