A novel centralized beamforming scheme for radio-over-fiber systems with fixed wavelength allocation

This paper proposes a novel centralized beamforming scheme for Radio-over-Fiber (RoF) systems with fixed wavelength allocation. The proposed scheme offers more wavelength utilization efficiency than the conventional beamforming methods that control wavelength allocation, and can control beam direction without explicit control by the base stations (BSs). Moreover, the scheme makes information about optical fiber length unnecessary, and supports systems that use high radio frequency (RF) signals or long optical fiber. Simulations evaluate and confirm the feasibility of the scheme for a system that uses 60 GHz RF signals, 10 km optical fiber, and 8-element linear array antennas.