通信学习（Communication learning）.docVIP

通信学习（Communication learning） Be sure to learn to program.. The best CPLD/FPGA, VHDL language, DSP, it is best to learn engineering, not programming.... A lot of hardware circuits are hard to accomplish now. They are all implemented by software method, communication engineering, software radio Comparison of | digital signal processing digital signal processor | | processor and DSP processor Digital Signal Processing digital signal processing As a case study, we consider the most common function in the digital domain: filtering. In brief, filtering is the processing of signals to improve their characteristics. For example, filtering can remove noise or static interference from the signal so as to improve its signal-to-noise ratio. Why use microprocessors instead of analog devices to filter the signals? Lets take a look at its advantages: The performance of analog filters (or, more generally, analog circuits) depends on environmental factors such as temperature. Digital filters are essentially unaffected by the environment. Digital filtering is easy to replicate in very small tolerance, because its performance does not depend on the combination of devices whose performance has deviated from normal values. Once an analog filter is created, its characteristics (such as passband frequency range) are not easily changed. The use of microprocessors to implement digital filters allows reprogramming to alter the characteristics of the filter. Comparison of signal processing methods Comparison factor, simulation method, digital mode FPGA profile FPGA is the abbreviation of English Field Programmable Gate Array, that is, field programmable gate array (), which is further developed on the basis of programmable devices such as PAL, GAL and EPLD. It has emerged as a semi custom circuit in the field of ASIC (ASIC), which not only solves the shortcomings of custom circuits, but also overcomes the shortcoming of the limited number of gate circuits of original programmable devices. FPG