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Open research questions in Advanced Wireless Communication Technologies

102 unresolved questions extracted from the limitations and future-work sections of 169 Advanced Wireless Communication Technologies papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Future research can focus on evaluating the performance of the algorithm in real-world scenarios. Future research can focus on extending the algorithm to other types of networks and applications.

    Joint security and energy optimization in UAV-enabled smart grid networks · 2026 · DOI

  • There is a need for communication solutions that are secure and energy-efficient in UAV-enabled smart grid networks. There is a need to address the influence of obstacles, such as dense buildings in urban areas, on UAV communications.

    Joint security and energy optimization in UAV-enabled smart grid networks · 2026 · DOI

  • The approach is limited to a simulation-based study. The paper assumes a uniform distribution of energy harvesting efficiency. The approach does not incorporate EH prediction or adaptive DDPG training.

    K -Means and DDPG-Based Access Point Deployment Strategy in Cell-Free Massive MIMO Systems With Hybrid Energy Supply · 2026 · DOI

  • The increasing energy consumption of mobile networks is a major challenge. Prior work has focused on enhancing energy efficiency, but a new approach is needed to minimize grid energy consumption. The paper identifies a gap in the existing research on cell-free massive MIMO systems.

    K -Means and DDPG-Based Access Point Deployment Strategy in Cell-Free Massive MIMO Systems With Hybrid Energy Supply · 2026 · DOI

  • Investigating the performance of RIS-aided near-field communications in different scenarios. Developing new beam training approaches for RIS-aided near-field communications. Analyzing the effective degrees of freedom of the RIS-to-receiver LoS MIMO channel in near-field communications.

    Reconfigurable Intelligent Surface-Aided Near-Field Communications for 6G: Opportunities and Challenges · 2024 · DOI

  • The lack of research on RIS-aided near-field communications for 6G. The need for new technologies to enhance the data rate, latency, and space-air-ground coverage.

    Reconfigurable Intelligent Surface-Aided Near-Field Communications for 6G: Opportunities and Challenges · 2024 · DOI

  • The AP does not need to know the channel coefficient α. The target response matrix H is estimable only when rank(G) = N.

    Intelligent Reflecting Surface Enabled Sensing: Cramér-Rao Bound Optimization · 2023 · DOI

  • The lack of a joint beamforming design that minimizes the Cramér-Rao bound. The lack of a closed-form expression for the CRB for the extended target scenario.

    Intelligent Reflecting Surface Enabled Sensing: Cramér-Rao Bound Optimization · 2023 · DOI

  • To explore the optimization of the training sequence of reflection coefficients at the RIS. To compare the performance of the proposed channel estimation protocol to other state-of-the-art methods. To study the application of the proposed channel estimation protocol in other communication systems.

    Channel Estimation for Reconfigurable Intelligent Surface Aided Multi-User mmWave MIMO Systems · 2023 · DOI

  • The lack of efficient channel estimation protocols for RIS aided multi-user mmWave MIMO systems. The need for a two-step multi-user joint channel estimation procedure. The optimization of the training sequence of reflection coefficients at the RIS is not fully explored.

    Channel Estimation for Reconfigurable Intelligent Surface Aided Multi-User mmWave MIMO Systems · 2023 · DOI

  • Future research can investigate the extension of the proposed approach to more complex scenarios. Future research can investigate the use of machine learning algorithms to solve the joint optimization problem. Future research can investigate the application of the proposed approach to other wireless communication systems.

    Secure Intelligent Reflecting Surface-Aided Integrated Sensing and Communication · 2023 · DOI

  • The paper identifies a research gap in the design of intelligent reflecting surfaces for integrated sensing and communication systems. The paper identifies a research gap in the development of algorithms to solve the joint optimization problem.

    Secure Intelligent Reflecting Surface-Aided Integrated Sensing and Communication · 2023 · DOI

  • To investigate the potential of RIS-assisted ISAC systems in various applications. To develop novel algorithms and models for RIS-assisted ISAC systems. To study the scalability and complexity of RIS-assisted ISAC systems.

    Integrated Sensing and Communication with Reconfigurable Intelligent Surfaces: Opportunities, Applications, and Future Directions · 2023 · DOI

  • The lack of research on RIS-assisted ISAC systems. The need for novel application scenarios and accurate models for RIS-assisted ISAC systems. The requirement for the design of associated algorithms for RIS-assisted ISAC systems.

    Integrated Sensing and Communication with Reconfigurable Intelligent Surfaces: Opportunities, Applications, and Future Directions · 2023 · DOI

  • The exact modeling of an RIS-assisted channel is a non-trivial and still debated problem. The design of the phase shifts introduced by the RIS elements is not well understood.

    Foundations of MIMO Radar Detection Aided by Reconfigurable Intelligent Surfaces · 2022 · DOI

  • Future research can focus on extending the proposed framework to more complex scenarios. Future research can focus on developing more advanced beamforming algorithms. Future research can focus on implementing the proposed framework in real-world applications.

    Location Sensing and Beamforming Design for IRS-Enabled Multi-User ISAC Systems · 2022 · DOI

  • The lack of a framework that can realize multi-user concurrent communication and localization using the same time-frequency resources. The need for a multi-user location sensing algorithm that can achieve millimeter-level positioning accuracy.

    Location Sensing and Beamforming Design for IRS-Enabled Multi-User ISAC Systems · 2022 · DOI

  • The lack of sensing elements or radio frequency chains in the IRS. The high coupling between the common-link variables and the user-specific variables. The need for a low-complexity algorithm with efficient initialization.

    Uplink Cascaded Channel Estimation for Intelligent Reflecting Surface Assisted Multiuser MISO Systems · 2022 · DOI

  • To consider temporal correlations of the channel blocks. To extend the algorithm to wide-band IRS-aided MU-MISO communication systems. To apply the algorithm to various wireless communication systems.

    Uplink Cascaded Channel Estimation for Intelligent Reflecting Surface Assisted Multiuser MISO Systems · 2022 · DOI

  • The inter-cell interference becomes the bottleneck for the capacity improvement of UDN. The non-convexity and high complexity of the formulated problem.

    A Joint Precoding Framework for Wideband Reconfigurable Intelligent Surface-Aided Cell-Free Network · 2021 · DOI

  • To study the impact of the number of REs on the received SNR. To investigate the optimization of the number of REs and the power amplification in the active RIS design.

    Active Reconfigurable Intelligent Surface-Aided Wireless Communications · 2021 · DOI

  • The conventional RIS designs suffer from double-fading attenuation, which can be compensated by a large number of passive reflecting elements. The active RIS-aided system can achieve better performance with fewer RIS elements.

    Active Reconfigurable Intelligent Surface-Aided Wireless Communications · 2021 · DOI

  • Future research can focus on extending the proposed system to more complex scenarios such as non-rectangular target areas. Future research can focus on investigating the impact of noise and interference on the system performance.

    Aerial Intelligent Reflecting Surface: Joint Placement and Passive Beamforming Design With 3D Beam Flattening · 2021 · DOI

  • The paper identifies the need for a novel beam broadening and flattening technique for AIRS-enabled wireless relaying systems. The paper identifies the need for an efficient solution for joint optimization of AIRS placement and passive beamforming.

    Aerial Intelligent Reflecting Surface: Joint Placement and Passive Beamforming Design With 3D Beam Flattening · 2021 · DOI

  • Further research can be done to consider the implementation cost and energy consumption of the double-IRS cooperative system. Further research can be done to generalize the results to other channel models and scenarios.

    Double-IRS Assisted Multi-User MIMO: Cooperative Passive Beamforming Design · 2021 · DOI

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102 open questions have been extracted from the limitations and future-work passages of 169 Advanced Wireless Communication Technologies papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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