The Time-Domain Equalization Research Of Underground High-s Peed Cable Transmission Based On OFDM And Its Realization In DSP

High-speed communication services are increasingly in line with the needs of the public,both in wireless communications and in the field of wired communications.Orthogonal frequency division multiplexing(OFDM)has high bandwidth utilization and anti-interference,anti-multipath capability and the advantages of high-speed serial data can be decomposed into multi-channel parallel narrowband data stream,multiple data streams through the modulation orthogonal to each other and sub-carrier transmission,sub-channel spectrum overlap with each other in the limited frequency band Send large amounts of data.At the same time its modulation and demodulation technology can improve the transmission rate of logging cable,in recent years has gradually been widely attention.The content of this paper is to summarize the characteristics of OFDM system and application scenarios,as well as the role played in the project.Based on channel estimation,time domain equalization and frequency domain equalization in OFDM system,the channel estimation and time domain equalization algorithm are simulated on MATLAB to verify the feasibility of the method.At the same time,the algorithm is transplanted into hardware DSP to realize acquisition Data equalization processing.The simulation results show that the channel estimation and time domain equalization method can restore the received distortion signal to the original signal well.