Nonlinear Clipping Estimation Method Based on Preamble Sequence of Visible Light Dco-ofdm Communication System
A technology of DCO-OFDM and communication system, applied in the field of channel parameter estimation and preamble sequence of visible light DCO-OFDM communication system, which can solve problems affecting the performance of visible light communication system, OFDM signal power adjustment, up-clipping, etc.
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[0044] The technical solution of the present invention will be further introduced below in combination with specific embodiments.
[0045] The invention discloses a leading sequence, ZC sequence+30 OFDM symbols. OFDM symbols use 128 subcarriers, starting from the first subcarrier, every 16 subcarriers are divided into groups, a total of 8 groups, respectively using {64QAM, 64QAM, 64QAM, 64QAM, 16QAM, 16QAM, 4QAM, 4QAM} modulation method At the same time, the 4 low-end subcarriers and the 16 high-end subcarriers are not used to ensure the performance of the communication system. In order to ensure that the time domain signal is a real number after IFFT, 128 conjugated symmetric subcarriers are added, that is, a total of 256 subcarriers are used . It can be calculated that one OFDM symbol requires 520 bits. Therefore, a preamble sequence needs ZC sequence plus 15600 bits in total. The original bit stream of OFDM symbols in the preamble sequence is generated by the PN sequence...
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