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Highlights: [•] We consider a multi-hop network situation instead of traditional two-hop topologies in OFDMA network. [•] We adopt Tabu searching algorithm to reduce the possibility of choosing low-quality subcarriers. [•] Our methods can combine the link groups with subcarrier groups in a global optimization method. [•] Our proposed algorithms can not only increase resource utilization but also realize dynamic selection of each link. [ABSTRACT FROM AUTHOR]

In Intensity-Modulation Direct-Detection (IM/DD) Orthogonal Frequency Division Multiplexing Passive Optical Networks (OFDM-PONs), aside from Subcarrier-to-Subcarrier Intermixing Interferences (SSII) induced by square-law detection, the same laser frequency for data sending from Optical Network Units (ONUs) results in ONU-to-ONU Beating Interferences (OOBI) at the receiver. To mitigate those interferences, we design a Low-Density Parity Check (LDPC)-coded and spectrum-efficient upstream transmission system. A theoretical channel model is also derived, in order to analyze the detrimental factors influencing system performances. Simulation results demonstrate that the receiver sensitivity is improved 3.4 dB and 2.5 dB under QPSK and 8QAM, respectively, after 100 km Standard Single-Mode Fiber (SSMF) transmission. Furthermore, the spectrum efficiency can be improved by about 50%. [ABSTRACT FROM AUTHOR]