Centralization and synchronization of millimeter-wave coordinated multi-point transmission in heterogeneous fiber-wireless access networks
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The objective of the proposed research is to study methods that improve reception quality in millimeter-wave wireless communications. Millimeter-wave bands provide sufficient spectral resource for directional small-cell coverage in a heterogeneous network. However, high-efficient communications in millimeter-wave frequencies need line-of-sight propagation. Coordinated multi-point transmissions can combat interference, increase the probability of line-of-sight propagation, and improve system efficiency, but have stringent requirements on synchronizations and backhaul capacity. Current standards and approaches for the coordination of cells operating at lower frequencies based on distributed processing can hardly apply on millimeter-wave. This work theoretically and experimentally explores new directions of coordinated multi-point transmission for millimeter-wave communications. Different from conventional approaches, the millimeter-wave coordination mechanisms proposed by this research are inherent from a fiber-wireless architecture that enables centralized processing for millimeter-wave generation, distribution, synchronization, and coordination. Based on supportive experimental results, this research further proposes the method of cell grouping for small cell design, the method of millimeter-wave radio bundling for mobile fronthaul design, and the method of optical processing. The proposed methods utilize centralized resources and high-capacity fiber links to provide coherency for efficient coordination and seamless integration with future heterogeneous networks.