Abstract
We propose and demonstrate a concept of photonics-aided coordination for multi-cell downlink
transmissions. The concept targets reliable high-throughput applications for future-proof millimeter-wave small cells
based on radio-over-fiber fronthaul. Based on the physical properties of millimeter waves and the phase and magnitude
relationship during optoelectrical conversion, a photonics-aided coordination module is proposed, which adjusts the
overall channel matrix of optical wireless transmissions in order to achieve a distortion-free reception. Exploiting
the multitude and density of remote access units, we specifically propose three methods of coordination, namely,
photonics-aided amplification, synthesis, and interference cancellation, which directly enhance the signal-to-noise
ratio, increase the throughput, and mitigate the interference of cell-edge users, respectively. These methods are
realized at the physical layer and can be transparent to data, which reduces the coordination overhead. Prototypes,
involving end-to-end downlink transmissions, are established, which demonstrate the feasibility and effectiveness of
the proposed methods for both scalar and vector signals.
© 2014 IEEE
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