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On performance of RIS-aided bidirectional full-duplex systems with combining of imperfect conditions

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Abstract

This article evaluates performance metrics in terms of outage probability (OP), throughput, and energy efficiency (EE) of the reconfigurable intelligent surface (RIS) assisted full-duplex (FD) wireless communication systems under the joint and separate effects of imperfect conditions such as residual transceiver hardware impairments (RTHIs) and residual self-interferences (SIs). More specifically, we derive the exact formulas of OP, throughput, and EE of the RSI-aided-FD systems with the joint effects of RTHIs and residual SIs. From the obtained expressions, it is easy to formulate the formulas of the relevant systems such as RIS-aided-FD systems without RTHIs and RIS-aided-half-duplex (HD) systems without and with RTHIs. Numerical illustrations clarify the huge impacts of RTHIs and residual SIs on the OP, throughput, and EE of the RIS-aided-FD systems, especially in the high data rate. In this situation, utilizing a large number of reflecting elements (REs) can dramatically enhance the OP, throughput, and EE performance of the RIS-aided-FD systems with RTHIs and residual SIs. Finally, the derived formulas are validated by using Monte-Carlo simulations.

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Notes

  1. In the case that the optimal number of REs could not be found in the RIS-aided wireless systems, the large size of RIS is required to achieve better performance than the DF relaying wireless systems [4, 8]. However, a large size of RIS can introduce the interference, especially in the RIS-aided multiuser systems [9]. In this circumstance, other optimization methods such as beamforming, deep reinforcement learning, and machine learning should be utilized to significantly enhance the performance of the RIS-aided wireless systems [9, 10].

  2. In practice, a FD node can use only one shared-antenna for both transmitting and receiving [20]. However, the utilizing two separate antennas in a FD device can get more convenient when deploying SI cancellation solutions, especially for the SI cancellation in the antenna domain [21].

  3. It is worth noticing that the building wall can be considered as a large reflecting aperture that can scatter and reflect the radio frequency signal randomly. Thus, the classical SI induced by scattering and reflecting via the building walls and the other objects (trees, factories,..) is often aggregated in only one term [20,21,22,23,24]. Meanwhile, the SI induced by advanced RIS has a strong power, thus, it is often defined as a separate term [2, 11]. In other words, the magnitudes of reflecting signals from RIS are greatly higher than those from the building/factory walls due to the features of RIS [3].

  4. It is better to note that the RIS-ITH-FD, RIS-RTHI-HD, and RIS-ITH-HD systems are, respectively, the RIS-aided FD systems with ideal transceiver hardware (ITH), the RIS-aided HD systems with RTHIs, and the RIS-aided HD systems with ITH.

  5. In this paper, we focus on the performance analysis of the RIS-RTHI-FD systems by mathematically deriving the OP, throughput, and EE expressions under the impacts of combined imperfect conditions. Thus, we normalize several parameters such as radio parameters and frequency. Notice that the normalizations were widely utilized in the previous works [1,2,3, 6, 11, 18, 31, 32].

  6. In other words, the symmetric model is determined in this section for ease in observation. However, by using derived formulas, we can investigate the performance of the RIS-RTHI-FD systems with the asymmetric model.

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Authors and Affiliations

  1. Communication and Signal Processing Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam

    Tan N. Nguyen

  2. Department of Information Assurance (IA), FPT University, Ha Noi, Vietnam

    Nguyen Van Vinh

  3. Faculty of Basic Techniques, Telecommunications University, Khanh Hoa, Vietnam

    Ba Cao Nguyen

  4. Faculty of Engineering and Technology, Nguyen Tat Thanh University, 300A - Nguyen Tat Thanh, Ward 13, District 4, Ho Chi Minh City, Vietnam

    Bui Vu Minh

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  1. Tan N. Nguyen
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Nguyen, T.N., Vinh, N.V., Nguyen, B.C. et al. On performance of RIS-aided bidirectional full-duplex systems with combining of imperfect conditions. Wireless Netw 30, 649–660 (2024). https://doi.org/10.1007/s11276-023-03490-7

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