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Open research questions in Advanced Wireless Communication Technologies

162 gap statements mined from Advanced Wireless Communication Technologies papers in our 4.5M-paper local library, which holds 1,850 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The lack of a realistic and reliable channel estimation framework for high-mobility vehicular communication systems. The need to incorporate hardware impairments into the channel estimation framework. The requirement for improved channel estimation accuracy in time-varying multi-user vehicular STAR-RIS systems.

    Kalman-aided uplink channel estimation for time-varying multi-user vehicular STAR-RIS systems · 2026 · DOI

  • The need to address channel estimation errors, Doppler effects, and feedback delays in highly mobile FANET environments.

    Alternating Optimization-Based Joint Power and Phase Design for RIS-Empowered FANETs · 2026 · DOI

  • Current centralized models achieve high accuracy but are limited in real-time utility in distributed 6G-IoT environments. Most FL-based distributed learning models for attack detection suffer from high communication latency. Existing collaborative edge-or fog-based FL approaches have limitations, such as relying on the device's computation capabilities for aggregation.

    Collaborative Federated Learning to Secure 6G-IoT with Deep Convolutional Generative Adversarial Network · 2026 · DOI

  • The optimization problem is complex and has multiple objectives. The number of deployed RISs needs to be minimized while raising the achievable rate. The RIS placement problem has spatial constraints and non-overlapping constraints.

    Optimized Reconfigurable Intelligent Surfaces Configuration in Multiuser Wireless Networks via Fuzzy-Enhanced Pied Kingfisher Strategy · 2026 · DOI

  • However, the joint impact of THI and channel coding on error performance in downlink rate-splitting multiple access (RSMA) systems remains unexplored.

    Coded Error Performance Analysis for RSMA Over Nakagami- m Fading With Transceiver Hardware Impairments · 2026 · DOI

  • However, the mechanism behind this distributional shape remains underexplored due to the end-to-end nature of encoder training, hindering systematic analysis and design.

    Symbol Distributions in Semantic Communications: A Source-Channel Equilibrium Perspective · 2026 · DOI

  • It implies that their combined impact on system performance has not yet been explored.

    Towards SMPC-enabled O-RAN: A survey with deployment-oriented insights · 2025 · DOI

  • However, research combining semantic communication and advanced multiple access techniques, such as rate splitting multiple access (RSMA), is still lacking.

    Compression Ratio Allocation for Probabilistic Semantic Communication With RSMA · 2025 · DOI

  • However, the performance benefits and new use cases enabled by non-reciprocal BD-RIS for wireless systems remain unexplored.

    Non-Reciprocal Beyond Diagonal RIS: Multiport Network Models and Performance Benefits in Full-Duplex Systems · 2025 · DOI

  • The RIS-FI path loss model presented in this paper may pave the way for further research on RIS-assisted wireless channels.

    A Floating-Intercept Path Loss Model Considering RIS Array Gain in Practical Environments · 2025 · DOI

  • In practice, the phase shift and the amplitude are coupled, and the phase choices are limited to a discrete set.

    RIS With Coupled Phase Shift and Amplitude: Capacity Maximization and Configuration Set Selection · 2025 · DOI

  • Finally, several open problems and challenges, including regarding its accuracy, complexity, and generalization, are discussed.

    Wireless Environmental Information Theory: A New Paradigm Toward 6G Online and Proactive Environment Intelligence Communication · 2025 · DOI

  • While many semantic theories have been put forward, how to measure the importance of semantic information theoretically remains an open issue.

    Importance of Semantic Information Based on Semantic Value · 2024 · DOI

  • For different L2L models trained with limited data, heuristic accuracy performance is determined by an upper bound of the probability of confidence.

    Learning-to-Learn the Wave Angle Estimation · 2024 · DOI

  • In THz-NOMA networks, efficient and effective long-term beamforming-bandwidth-power (BBP) allocation is yet an open problem due to its non-deterministic polynomial-time hard (NP-hard) nature.

    Multi-Task Deep Reinforcement Learning for Terahertz NOMA Resource Allocation With Hybrid Discrete and Continuous Actions · 2024 · DOI

  • Limited by the number of antenna elements, conventional array radars usually have insufficient ability of signal-dependent interference suppression in harsh environments, even though transmit and receive beamformers are jointly designed.

    Interference Suppression for Active RIS-Empowered Array Radar Using Joint Beamforming Design · 2024 · DOI

  • 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

  • Future research will focus on ensuring compatibility with existing network architectures and incorporating dynamic user mobility models to enhance the practical applicability and robustness based on the proposed AP deployment framework.

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

  • By utilizing the benefits of RS, we define a group RS (GRS) framework that serves multiple user equipments without being limited by the number of radio frequency chains.

    Sum Rate Maximization With Rate-Splitting Multiple Access for Hybrid Precoding Systems · 2025 · DOI

  • Considering the attributes of${\mathcal {O}}({N^{2}})$reflecting beamforming gain and reconstructing line-of-sight (LOS) links, intelligent reflecting surface (IRS) could significantly improve the vehicle-to-infrastructure (V2I) channel capacity, while system-level analysis via stochastic geometry has not been analyzed.

    Line Process Modelling and Performance Analysis of Intelligent Reflecting Surface-Assisted Vehicular Networks · 2025 · DOI

  • Investigating the performance of the proposed system in wide-band wireless channels, - Developing more efficient channel estimation algorithms for STAR-RIS-aided vehicular communication systems, - Evaluating the impact of hardware impairments on the system…

    Kalman-aided uplink channel estimation for time-varying multi-user vehicular STAR-RIS systems · 2026 · DOI

  • The work assumes an idealized feedback model, - Quantization errors due to limited sensing resolution are not considered, - Feedback latency from sensor sampling and transmission delays are not accounted for, - Sensor noise is not fully…

    Sustainable THz SWIPT via RIS-Enabled Sensing and Adaptive Power Focusing: Toward Green 6G IoT · 2025 · DOI

  • Modelling non-ideal RIS sensing using a stochastic framework, - Incorporating molecular absorption and path loss via the HITRAN-based THz channel model, - Extending the APF performance analysis under realistic sensing…

    Sustainable THz SWIPT via RIS-Enabled Sensing and Adaptive Power Focusing: Toward Green 6G IoT · 2025 · DOI

  • Finally, this article discusses the open challenges like the beam splitting in broadband millimeter-wave systems and the joint channel estimation problem in STAR-RIS systems, giving some direction for future study.

    A Survey on RIS-Assisted Millimeter-Wave Channel Estimation · 2026 · DOI

  • Finally, we discuss the current challenges, point out open issues, and outline potential future research directions in this field.

    AI-Empowered Multiple Access for 6G: A Survey of Spectrum Sensing, Protocol Designs, and Optimizations · 2024 · DOI

Most-cited papers in Advanced Wireless Communication Technologies

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Open questions raised by papers listed on this page include: (1) The lack of a realistic and reliable channel estimation framework for high-mobility vehicular communication systems (“Kalman-aided uplink channel estimation for time-varying multi-user vehicular…”, 2026); (2) The joint impact of THI and channel coding on error performance in downlink rate-splitting multiple access (RSMA) systems remains unexplored (“Coded Error Performance Analysis for RSMA Over Nakagami- m Fading With…”, 2026); (3) The mechanism behind this distributional shape remains underexplored due to the end-to-end nature of encoder training, hindering systematic analysis and design (“Symbol Distributions in Semantic Communications: A Source-Channel Equilibrium…”, 2026); (4) Future research can focus on evaluating the performance of the algorithm in real-world scenarios (“Joint security and energy optimization in UAV-enabled smart grid networks”, 2026); (5) Future research will focus on ensuring compatibility with existing network architectures and incorporating dynamic user mobility models to enhance the practical applicability and robustness based on the proposed AP deployment framework (“K -Means and DDPG-Based Access Point Deployment Strategy in Cell-Free Massive…”, 2026). 162 gap statements have been mined from Advanced Wireless Communication Technologies papers in our 4.5M-paper local library, which holds 1,850 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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