| Citation: | LIU C Y，YAN R W，WANG T，et al. Optimizing airborne PLC capacity through insufficient CP and window in OFDM-based communication[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（8）：2557-2564 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0636
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Power line communication (PLC) decreases cabling volume and reduces wiring harness complexity. Therefore, capacity is not optimal if sufficient cyclic prefix (CP) that is no shorter than the channel duration is employed. Multipath components, on the other hand, suffer modest attenuation in PLC channels, creating extended channel duration. Therefore, it is reasonable to adopt insufficient CP combined with a windowing scheme to maximize capacity. A comprehensive approach to jointly adapt window and CP parameters is proposed, using the edge-window method which applies different windows to inner and edge subcarriers. Using frequency-selective impedances and airborne PLC topologies, one can first simulate PLC channels in accordance with transmission line theory. The CP and window settings should then be adjusted in three phases. In the first stage, obtain the minimum window overhead under the restriction of adjacent channel interference (ACI). In the second stage, adjust CP length to optimize capacity with the window obtained in the first stage. In the third stage, using edge-window, optimize inner and edge subcarriers separately and finally obtain optimal parameters. The results of the simulation indicate that the suggested strategy might approach or meet the maximum capacity achieved by full space enumeration, avoid excessive time growth of orthogonal frequency division multiplexing (OFDM) symbols while lowering ACI, and make the computation volume acceptable.
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