Network Coexistence Analysis of RIS-Assisted Wireless Communications

Zhao, Yajun; Lv, Xin

doi:10.1109/access.2022.3183139

Cited by 18 publications

(22 citation statements)

References 37 publications

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“…Problems faced by RIS in engineering applications have been analyzed and studied, but the number of literature and related achievements are still insufficient. Based on our previous work [5] [6], this paper will make a further systematic and in-depth analysis of the challenges and candidate solutions of RIS engineering applications. According to our research, although the engineering application of RIS will face many challenges, there are corresponding solutions to overcome these challenges.…”

Section: Of 27mentioning

confidence: 99%

“…The RIS cascade channel model DL H given in [5] is shown as follows (ignoring the direct channel between BS-UEs). From the formula, it can be seen that the regulation coefficient matrix Φ of RIS is located between the two segmented channel matrices (the channel G between NB-RIS and the channel H between RIS-UE ).…”

Section: Challenges Of Cascaded Channelsmentioning

confidence: 99%

“…The RIS with the tuning characteristic uses the same weighting coefficient matrix to tune all signals incident on it in a wider frequency band. Therefore, the existing RIS cannot optimally match more than one sub-band channel at the same time, which may lead to serious network coexistence problems [5][6], and cannot well support multiple UEs access with FDMA.…”

Section: Influences Of Ris Regulatory Constraintsmentioning

confidence: 99%

“…Different UE channels based on OFDMA are orthogonal in the frequency domain, but share the same analog beamforming matrix, which restricts the freedom of these UE channel spaces and cannot well match their channel spaces respectively. [27] The influence of RIS tuning limitation was analyzed in our previous article [5]. Without losing generality, assuming that there is a scattering path (the channel component of ue ris nb − −…”

Section: Influences Of Ris Regulatory Constraintsmentioning

confidence: 99%

“…In [5][6], we proposed a RIS blocking mechanism to solve problems of the RIS network coexistence. The basic idea of the RIS blocking mechanism is that the incident signals of different UEs can be assigned to different sub-blocks of the RIS, and each sub-block can tune signals incident on it by using an independent coefficient matrix separately, as shown in Figure 5.…”

Section: A) Ris Blocking Schemesmentioning

confidence: 99%

See 4 more Smart Citations

Reconfigurable Intelligent Surfaces for 6G: Applications, Challenges and Solutions

Zhao¹,

Lv²

2022

Preprint

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It is expected that scholars will continuously strengthen the depth and breadth of theoretical research on RIS, and provide a higher theoretical upper bound for the engineering application of RIS. While making breakthroughs in academic research, it has also made rapid progress in engineering application research and industrialization promotion. This paper will provide an overview of RIS engineering applications, and make a systematic and in-depth analysis of the challenges and candidate solutions of RIS engineering applications. Future trends and challenges are also provided.

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Section: Of 27mentioning

confidence: 99%

Section: Challenges Of Cascaded Channelsmentioning

confidence: 99%

Section: Influences Of Ris Regulatory Constraintsmentioning

confidence: 99%

Section: Influences Of Ris Regulatory Constraintsmentioning

confidence: 99%

Section: A) Ris Blocking Schemesmentioning

confidence: 99%

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Reconfigurable Intelligent Surfaces for 6G: Applications, Challenges and Solutions

Zhao¹,

Lv²

2022

Preprint

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A filtering reconfigurable intelligent surface for interference-free wireless communications

Liang,

Zhang,

Luo

et al. 2024

Nat Commun

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The powerful capability of reconfigurable intelligent surfaces (RISs) in tailoring electromagnetic waves and fields has put them under the spotlight in wireless communications. However, the current designs are criticized due to their poor frequency selectivity, which hinders their applications in real-world scenarios where the spectrum is becoming increasingly congested. Here we propose a filtering RIS to feature sharp frequency-selecting and 2-bit phase-shifting properties. It permits the signals in a narrow bandwidth to transmit but rejects the out-of-band ones; meanwhile, the phase of the transmitted signals can be digitally controlled, enabling flexible manipulations of signal propagations. A prototype is designed, fabricated, and measured, and its high quality factor and phase-shifting characteristics are validated by scattering parameters and beam-steering phenomena. Further, we conduct a wireless communication experiment to illustrate the intriguing functions of the RIS. The filtering behavior enables the RIS to perform wireless signal manipulations with anti-interference ability, thus showing big potential to advance the development of next-generation wireless communications.

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RIS assisted wireless networks: Collaborative regulation, deployment mode and field testing

Zhao

2024

IET Communications

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In recent years, reconfigurable intelligent surfaces (RIS) have made significant progress in engineering application research and industrialization, as well as in academic research. However, the engineering application research field of RIS still faces several challenges. This article analyses and discusses the two deployment modes of RIS‐assisted wireless networks, namely network controlled mode and standalone mode. It also presents three typical collaboration scenarios of RIS networks, including multi‐RIS collaboration, multi‐user access, and multi‐cell coordination, which reflect the differences between the two deployment modes of RIS. The article proposes collaborative regulation mechanisms for RIS and analyses their applications in the two network deployment modes in‐depth. Furthermore, the article establishes simulation models of three scenarios and provides rich numerical simulation results. An actual field test environment is also built, where a specially designed and processed RIS prototype was used for preliminary field test and verification. Finally, this article puts forward future trends and challenges.

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Network Coexistence Analysis of RIS-Assisted Wireless Communications

Cited by 18 publications

References 37 publications

Reconfigurable Intelligent Surfaces for 6G: Applications, Challenges and Solutions

Reconfigurable Intelligent Surfaces for 6G: Applications, Challenges and Solutions

A filtering reconfigurable intelligent surface for interference-free wireless communications

RIS assisted wireless networks: Collaborative regulation, deployment mode and field testing

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