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This paper studies the Intelligent reflecting surface (IRS)-based communications, including the fixed and UAV-mounted IRSs. IRSs can be deployed in locations that are difficult to receive or transmit signals due to obstacles or remote areas by passively reflecting the signals received from base stations (BSs). The IRSs can reflect signals in the designed way to enhance the transmitted signal or enable line-of-sight (LOS) communications. They can be fixed on the side of high buildings to reflect signals or mounted on the UAVs to provide temporary wireless communications in the remote areas. This paper conducts an overview on IRS-based communications including the existing problems, challenges, and possible solutions. |
