About this Research Topic
Reconfigurable Intelligent Surfaces (RISs) have gained significant research attention recently, as a means to enable reconfigurable propagation environments which can be tuned to provide wireless communication capabilities. This is achieved, for example, by using a reconfigurable surface, whose reflection/scattering profile can be controlled by a base-station (BS) using a control channel. This adds controllable paths to the channel, which is particularly useful in propagation environments with severe blockage or in scenarios where propagation range is a challenge like mm-Wave communications. The reconfigurable surface is generally adapted to increase the signal-to-interference-plus-noise ratio (SINR) at a desired receiver which consequently improves utility in terms of data rates, error rates, communications range, etc.
As research on RIS-enabled wireless communications is still at its early stages, there are many open questions that need to be answered. For instance, channel modelling for RIS-enabled wireless communications is an important area, with many implications such as in the area of the estimation of such channels. Applications of RIS in wireless communications is another important area, especially research into applications where RIS can be a key element of future generation wireless networks. For such applications, the development of transmission schemes and their optimization are important areas, whether using classical tools or newer machine-learning techniques. Finally, the impact of RIS on future generation networks can only be answered by extensive performance analysis, which reflects the capability of RISs to enable enhanced communications in challenging environments. Many other questions related to implementation, energy-efficiency, cost, etc. revolve around the aforementioned areas, and are all of interest to enable an enhanced wireless communications future.
It is envisioned that research into RIS-enabled wireless communications can potentially uncover important opportunities that enhance future communication technologies. Thus, the goal of this Research Topic is to attract research works that provide innovative ways of using RISs to enhance wireless communications and creating new opportunities for future cellular communications generations.
High quality technical papers with original results on theory and applications of RIS are solicited. Survey/tutorial-like papers with sufficient novelty compared to existing surveys/tutorials (reviews) may also be considered. The scope of this Research Topic includes, but is not limited to, the following areas:
• Channel modelling and estimation for RIS-enabled networks
• Fundamental limits of RIS-enabled networks
• Performance analysis and optimization of transmission schemes for massive-MIMO RIS-enabled networks
• Performance analysis and optimization of transmission schemes for Multi-user RIS-enabled networks
• RIS-enabled mm-wave and Terahertz communications
• Machine learning techniques for RIS-enabled networks
• Energy- and cost-efficiency of RIS-enabled networks
• RIS-enabled cloud radio-access networks
Keywords: Beyond 5G, Propagation environment, Reconfigurable Intelligent Surfaces, Transmission schemes, Wireless communications
Important Note: All contributions to this Research Topic must be within the scope of the section and journal to which they are submitted, as defined in their mission statements. Frontiers reserves the right to guide an out-of-scope manuscript to a more suitable section or journal at any stage of peer review.