Abstract

We propose and experimentally demonstrate a non-orthogonal multiple access (NOMA) enabled 60 GHz radio-over-fiber (RoF) fronthaul system with coordinated base stations, improving the data rate and coverage of 60 GHz RoF systems. First, coordinated multipoint transmission using space-time block coding (STBC) is adopted in fronthaul, achieving 1.3 dB improvement in receiver sensitivity compared to two fronthaul links’ transmission without STBC. Second, multi-cell coordination in RoF fronthaul is presented, where a multi-level code (MLC)-based NOMA scheme is employed. A sum rate of 6 Gbps for three users is achieved along 10 km fronthaul transmission and 1.24 m wireless transmission. The experimental results show that the valid power allocation ratio range improves from $3.5\le \mathfrak{R}\le 4.2$ in conventional superposition code-based NOMA fronthaul to $3\le \mathfrak{R}\le 5$ in our proposed coordinated MLC-NOMA fronthaul link.

© 2018 Optical Society of America

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