Multi-ary Transmission Pre-emphasis Method Based On White Light Channel

With the rise and development of intelligent communication and wireless network technology,it has a wide range of applications in people's daily life,simpler,faster,and more convenient access to information to meet people's communication requirements in the new era.However,wireless communication based on microwave technology is restricted in some areas(hospitals,airports,etc.),and Visible Light Communication(VLC)is the use of lighting equipment for data transmission.In addition,it has the high propagation speed of fiber-optic communication and the flexibility of RF communication.The indoor coverage is wide and there is no radiation problem,which is harmless to the human body.There is no radiation problem,which is considered to be Technology with great development potential and application background has become a hot topic in recent research.When the signal is transmitted in a high-speed transmission process in a white optical channel,the conventional binary transmission is used,and although the low-speed signal can be stably transmitted,the bandwidth utilization of the binary transmission is low,and the high-frequency attenuation of the signal during transmission is severe,and inter-symbol interference occurs.Inter-Symbol Interference(ISI)makes it difficult for the receiving end to recover the signal,limiting the signal transmission speed.In order to realize high-speed data transmission under low power consumption,this paper proposes a multi-ary data transmission method.Multi-ary transmission of one signal represents multiple bit streams,which can greatly improve the transmission speed of white optical channels,but in many cases.In the hexadecimal transmission,the signal-to-noise ratio is reduced due to the balanced attenuation of the white optical channel,which affects the quality and efficiency of the communication transmission.Aiming at this problem,this paper proposes a forward pre-emphasis compensation model for multi-ary pulse sequences.Based on this model,the octal digital baseband signal is taken as an example.Matlab modeling is used to analyze the matching relationship between pre-emphasis factor and data sequence.The received waveform and eye diagram under the method can be seen that the improved pre-emphasis method has better transmission performance and higher quality,and then the optimized value is simulated.Based on this optimization value and comprehensive analysis of the various components and performance of the system circuit,the actual circuit is built,and the model data is imported into the FPGA platform for verification.By observing the waveform change of the oscilloscope,thetime-frequency of the multi-ary pulse sequence is further verified.The transform method pre-emphasis method can effectively improve the transmission quality.Experiments show that based on the new pre-emphasis model,the signal-to-noise ratio is increased by 58% and the channel speed is increased by 100 kbit/s.