A Frequency Domain DSP Scheme with Pre-equalization for DSCM Transmitters

DSCM is a communication technology based on advanced DSP, which can effectively improve the tolerance to fiber nonlinearity and increase the transmission distance and capacity. However, compared with the high symbol rate single carrier system, the DSCM signal is more sensitive to insufficient device bandwidth. Therefore, a DSP scheme with pre-equalization is needed for DSCM transmitters. A frequency domain DSP scheme with pre-equalization function for DSCM transmitters is proposed. This scheme can complete filter shaping, subcarrier multiplexing, and pre-equalizing with lower computational complexity and the impairment caused by insufficient bandwidth of transmitter devices can be compensated effectively.