"数字信号传输性能分析仪：眼图对基带系统性能评估的重要作用"

Eye diagram provides valuable information for evaluating the performance of a digital signal transmission system, such as the magnitude of inter-symbol interference and the strength of noise. It helps to intuitively understand the impact of inter-symbol interference and noise, and assess the performance of a baseband system. The formation of the eye diagram is due to the persistence effect of the oscilloscope, where the scanned waveform of each symbol overlaps to form the eye diagram. In this design, a digital signal generator is created using programmable devices and linear shift registers to generate digital signals and pseudo-random signals. A low-pass filter is used to simulate the transmission channel, and the pseudo-random signal is simulated as channel noise. An FPGA along with peripheral circuits serve as the digital signal processing system to extract the bit synchronization signal. The digitized signal after passing through the simulated channel is then processed by a digital signal analysis module, and the eye diagram is observed using an oscilloscope for further analysis and adjustment. In conclusion, the eye diagram is a valuable tool for assessing the performance of a digital signal transmission system. By analyzing the eye diagram, one can evaluate the effects of inter-symbol interference and noise, and make necessary adjustments to improve system performance. This design utilizes programmable devices, linear shift registers, and FPGA to create a digital signal processing system for generating and analyzing digital signals, providing a comprehensive solution for evaluating and optimizing digital signal transmission systems.