Key Technologies And Implement Of The Verification Platform For CSS Communication Detection Systems

With the rapid development of modern wireless communication technology and Internet technology,both the speed and the scope of information dissemination have tremendous progress compared to the past.At the same time,it's also an increasing demand wireless communication.Currently,wireless communication is moving towards a direction of high rate,large capacity,high security and high reliability.In some complex scenes communication,detection and interference devices are always needed at the same time,which will greatly increase the cost of the systems and reduce the work efficiency.Therefore,it has a very important practical significance.This will also be the new trend of the development of the electronic equipment.Based on the integration thoughts,the communication system and the detection system of the same signal will be integrated into a communication detection system.The main contents of the paper are as follows:First,the basic principles of CSS technology and the project of transmitter modulation techniques are introduced,and then as a key point,two kinds of receiving algorithm are suggested,a coherent method based on match filters and a non-coherent method based on CORDIC differential frequency discrimination.A mathematical model of CSS communication system is built to simulate the bit error rate of CSS system under Gaussian white noise,Doppler shift and synchronization deviation channel.Secondly,in order to further understand the characteristics of CSS signal,CSS signal amplitude spectrum and power spectral density are derived,and then highlights the related concepts of cyclic spectral density,and the cyclic spectral density features of CSS and other typical communication signal are analysed.Finally,the demonstration platform of communication detection systems based on FPGA is built by using Verilog HDL as the design language,programmes of each module are compiled and debugged on an FPGA programmable board.And from the view of hardware,this article has proved the feasibility and effectiveness of this communication detection systems.