This paper summarizes implementation of VS(Visual Studio) crystal reports． It adopts Object-oriented thought， and gives a new method of dynamic binding of data source for crystal reports based on C#．

This paper presented the design and realization ways of 4ASK based on VHDL，which applied hierarchical and modular design and introduced the realization ways of carrier wave generation，amplitude modulation，amplitude discrimination．Finally，the simulation results given by MAX+PUSSⅡ and the test results given by EPF10K10LC84 indicated that the designed system was flexible and reliable．

3G wireless communications technology is the mobile communications technology in the experience of the first-generation analog mobile phone system (1G and) second-generation GSM， CDMA mobile phones and other digital (2G) developed based on the． In this paper， the development of 3G technology and application trends and an analysis of the prospects．