HPAM-DMT-NOMA method based on time-domain preprocessing
By introducing the HPAM-DMT-NOMA method of time-domain preprocessing into the VLC system, clipping noise interference is eliminated, spectral and power efficiency is improved, system complexity is reduced, and the problems of low efficiency and error propagation in the prior art are solved, thus achieving efficient user information transmission.
CN116131943BActive Publication Date: 2026-05-26ZHONGKE YIHAI HIGH TECH DEV JIANGSU CO LTD +1
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHONGKE YIHAI HIGH TECH DEV JIANGSU CO LTD
- Filing Date
- 2022-12-09
- Publication Date
- 2026-05-26
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Abstract
This invention discloses an HPAM-DMT-NOMA method based on time-domain preprocessing, comprising: At the transmitting end, PAM modulation is performed on the input user transmission bits to generate PAM symbols; after power superposition, serial-to-parallel conversion, and Hermitian symmetry, the symbols are allocated to two signal components for HPAM-DMT transmission; the frequency domain signals of PAM-DMT and RPAM-DMT are calculated; an IFFT operation is performed to obtain the time domain signal; the time-domain preprocessed signal is calculated; the RPAM-DMT time domain signal is calculated and superimposed on the clipped PAM-DMT signal for synchronous transmission to obtain a mixed signal; a reconstructed signal is introduced, processed, and input to drive an LED for illumination; at the receiving end, the received signal is processed to generate a frequency domain signal, and finally, the multi-user signal is recovered. This scheme eliminates clipping noise interference between the mixed signal components, avoids error propagation problems, and achieves high spectral efficiency and power efficiency.
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