The white noise, which is refers to the power spectral density in the entire frequency range the uniform distribution noise, is a kind of the universal existence noise signal in the reality communications system. To carry on the accurate test and the analysis to communications system's performance,the technical personnel need to be able to simulate the real environment of communication under the laboratory condition. White noise generator is to be born here.
This article through the analysis of white noise principle Proposes to realize the pseudo-random sequence method based on the programmable logical component,which has given the hardware circuit diagram, VHDL language and m sequence simulation waveform. This method has the hardware design to achieve a simple and low cost.Because CPLD has the characteristic which can be Repeat programming and the online revision , is advantageous for equipment's debug and runing.
Keywords: white noise, m sequence ,CPLD, VHDL language