Modulation Technique In Mobile Communication

In recent years,mobile communication service in our country has a great development, it has penetrated to each aspect of our social life. Along with the grows of motion user group and emerges of new service one after another incessantly, mobile communication system should adapts even advances promptly than the step of market demand. Moreover today mobile communication has become one kind of communication domain which has the most vigor and development future, the higher request of future communication will become its evolution driving force,and each kind of communication technique which it correlate with has becomes a hot spot for people study,it worth us paying attention to and studying closely.The prime task in this paper is to study and summarizes the modulation Technique in mobile communication and its realization method.For the analog communications system and the digital communication system modulation demodulation technology, we use the EDA tool to carry on analyzes and discusses. Moreover,in the paper the modulation and demodulation technique in analog communications system is confirmed by tests.For the modulation and demodulation technique in the digital communication system, it is carried on the VHDL programming based on FPGA and realized the software program with C++.The paper followup mission is to familiar the basic principle of QAM and GMSK,on the base of it ,then program it with C++ and simulate with System View.After that , induct the C programming result data to Maltab, through matlab software modulation signal profile can be demonstrated, and for doing this we can determine the programming ture or wrong .