STAR-RIS-assisted communication with adaptive transmit power and vibration-based energy harvesting

This paper explores an innovative wireless communication framework that combines Simultaneously Transmitting and Reflecting Reconfigurable Intelligent Surfaces (STAR-RIS) with vibration-based energy harvesting and adaptive power control. In this setup, a secondary transmitter captures energy from ambient mechanical vibrations and adjusts its transmission power on the fly to minimize interference with a primary receiver. The secondary signal is then reflected and transmitted using a STAR-RIS, facilitating effective signal delivery to two secondary users situated in the reflective and transmissive areas of the RIS, referred to as Ur and Ut, respectively. Numerical results highlight the proposed scheme’s effectiveness in improving system performance, especially in environments with strong vibration sources and tight interference limits.