The Development Of Digital Communication System For Teaching Experiment

As a result of the microelectronics technology and the computer technology rapid development,in the electronic circuit design do main the electric circuit board design obtained the widespread application.I combine own nature of the work to design a set of the digital transmission communications for practical teaching.This thesis to in communications some important links,including the channel,the noise,analog signal digitized transmission,the channel coding as well as the signal modulation demodulation principle,the method and the process has carried on the detailed elaboration.Analog transmission of digital applies pulse-code modulation(PCM).The part of modulation and demodulation applies differential phase-shift keying(DPSK) technology.Then it applies transmitting-receiving antenna to transmit and receive.My thesis introduces the appliance and development of digital communication technology.This thesis is based on the advantage of digital communication system.Then it is introduced the whole circuit board design course from three modules.First from collecting material initial stage,the principle that the research institute uses is designed the overall scheme.Have an overall mentality and the concept to the topic,and designs the overall plan of the digital communication system.Next is unit circuit design,makes the thorough analysis to each sub- electric circuit.Design and calculation are made to the concrete circuit to each module,with the function to realize the module.Finally, circuit board designed and circuit board installation and debugging.Use Protel DXP to carry on the basic diagram design,design of circuit board after the simulation success;Install the circuit board and does the system test.The overall design work is completed,to meet the design requirements.At the end of the article on the design of some experience and shortcomings and the future development direction has expounded.