Abstract
In this paper, the advantages of multiple reconfigurable intelligent surfaces (RISs) assisted wireless systems and direct link between two terminals are exploited by considering a cooperative communication system where reflecting links created by multiple RISs and the direct link are combined at the receiver. We mathematically analyze the performance of the cooperative multiple RISs - direct link (RIS-D) system over Nakagami- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$m$ </tex-math></inline-formula> fading channels by obtaining the symbol error probability (SEP) expression. In addition, the SEP of the single-input single-output (SISO) system without RISs (i.e., there is only direct link between two terminals) is also obtained for convenience in comparison the performance of the cooperative RIS-D and SISO systems. We demonstrate the correctness of the derived expressions via Monte-Carlo simulations. Numerical results show that the SEP of the cooperative RIS-D system significantly lower than that of the SISO system for a certain transmission power of the transmitter. Also, for a certain SEP target, the cooperative RIS-D system can greatly save energy consumption in comparison with the SISO system. Specifically, increasing the number of RISs or the number of reflecting elements (REs) in the RISs can remarkably reduce the SEP of the cooperative RIS-D system. On the other hand, the impacts of the system parameters such as the number of RISs, the number of REs, and the Nakagami- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$m$ </tex-math></inline-formula> fading channels are fully investigated to clearly indicate their influences on the SEP of the cooperative RIS-D system.
Highlights
In the era of Internet of Things (IoT) devices and the fourth industrial revolution, high data transmission rate, high spectrum efficiency, high reliability, and low energy consumption are required for wireless communication systems, especially in the current and future cellular networks such as the fifth generation (5G) and beyond networks [1], [2]
In this paper, we exploited the advantages of the cooperative communications and the reconfigurable intelligent surfaces (RISs) by combining them in a wireless communication system
We mathematically analyzed the performance of the cooperative RISs - direct link (RIS-D) system where the multiple reflecting links created by multiple RISs are combined with the direct link between source and destination
Summary
In the era of Internet of Things (IoT) devices and the fourth industrial revolution, high data transmission rate, high spectrum efficiency, high reliability, and low energy consumption are required for wireless communication systems, especially in the current and future cellular networks such as the fifth generation (5G) and beyond networks [1], [2]. Numerical results clearly show that the SEP performance of the considered cooperative RIS-D system are significantly improved in comparison with that of the SISO system.
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