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In this work, we propose a new single-RF MIMO architecture which enjoys highscalability and energy-efficiency. The transmitter in this proposal consists ofa single RF illuminator radiating towards a reflecting surface. Each element onthe reflecting surface re-transmits its received signal after applying aphase-shift, such that a desired beamforming pattern is obtained. For thisarchitecture, the problem of beamforming is interpreted as linear regressionand a solution is derived via the method of least-squares. Using thisformulation, a fast iterative algorithm for tuning of the reflecting surface isdeveloped. Numerical results demonstrate that the proposed architecture isfully compatible with current designs of reflecting surfaces.

A Single-RF Architecture for Multiuser Massive MIMO via Reflecting Surfaces