This paper sprays five hybrid pulse width modulation strategies for three level inverters in FPGA platform. The proposed hybrid-modulation strategy is an amalgamation of fundamental-frequency modulation and any carrier based pulse width modulation (SPWM) invoking the performance of the well-known carrier based PWM modulations. The main philosophy of this modulation is the reduction of switching...

Abstract For pulse compression characteristics and not easily affected by noise, linear frequency modulation signal are widely used in underwater acoustic communication. This paper analyzes the characteristics of hyperbolic frequency modulation signal over underwater acoustic channels. Compared with linear frequency modulation signal, hyperbolic frequency modulation has the same performance of ...

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 co...