Distributed digital pre-equalization system and method

The invention relates to the technical field of visible light communication, and particularly discloses a distributed digital pre-equalization system and method. According to the system, serial input bit data is converted into two parallel parts through a first serial-parallel transform unit; then high-band QAM and low-band QAM are respectively carried out through a high-band modulation unit and a low-band modulation unit, and during modulation, self-adaptive equalization adjustment is carried out on bandwidths and powers of a high-band and a low-band through a distributed pre-equalization unit by taking maximization of a system achievable data rate as a target; and finally, inverse Fourier transform and serial output are carried out through a fast inverse Fourier transform unit and a first parallel-serial transform unit to obtain corresponding OFDM signals, and the corresponding OFDM signals are transmitted to an OFDM demodulation module for corresponding demodulation, so that by flexibly adjusting and optim