Orthogonal and Sparse Chirp Division Multiplexing for MMW Fiber-Wireless Integrated Systems

Millimeter wave (MMW) bands provide enormous potential in accommodating the explosive mobile data traffic with an increased bandwidth. And fiber-wireless integration is feasible with reduced remote radio head complexity and improved performance by inter-cell coordination. Targeting on improving the wireless transmission reliability in ultra-reliable low-latency communication (URLLC) while maintaining high spectral efficiency in enhanced mobile broadband (eMBB) in 5G, we propose an orthogonal chirp division multiplexing modulation in MMW fiber-wireless integrated systems. By adjusting the sparsity in chirp assignment, we can dynamically and digitally switch between eMBB and URLLC, to serve different traffic patterns and requirements. Without significantly additional complexity in system architecture and DSP, we experimentally demonstrate better reliability to interferences and noises without losing the eMBB data rate or performance.