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- W4384304088 abstract "This paper presents a method for increasing the operating frequency range of a sub-6 GHz transmitter to millimetre wave (mm-wave) using two cascaded frequency doublers. The usage of such a frequency up-conversion approach is constrained since applying the first frequency doubler’s generated harmonics to the second doubler for mm-wave signal creation, results in severe distortions and bandwidth expansion of the transmitted signal, limiting the use of such frequency up-conversion method. We have proposed a combined gain and phase retarder and physically inspired cascaded feed-forward neural network (CFFNN) based digital predistortion to mitigate the bandwidth expansion and distortions. A comparative study of feed-forward neural networks (FFNN) and CFFNN has been carried out to establish CFFNN as a significant and less complex model for effective DPD of frequency quadrupler. For proof of concept, we have experimentally validated this method for Long-Term Evolution (LTE) 20 MHZ (64-QAM) signal at 24 GHz frequency band using commercially available frequency multipliers. The measurement results show the bandwidth expansion is reduced approximately 11-12 times, and the adjacent channel power ratio (ACPR) of around -45.1 dBc and error vector magnitude (EVM) of approximately 3.07% is achieved." @default.
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- W4384304088 date "2023-01-01" @default.
- W4384304088 modified "2023-09-26" @default.
- W4384304088 title "High-Frequency Signal Generator Using Cascaded Frequency Multiplier" @default.
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- W4384304088 doi "https://doi.org/10.1109/access.2023.3295491" @default.
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