The Design Of Channel Environment Simulation System For Wireless Communication Terminals

With the information time coming deeper effect on in human living, wirelesscommunication developing faster and faster, all types of wireless communication terminals’application will make the electromagnetic environment more and more complicated. Theelectromagnetic interference and ani-interference are developed faster and faster, especiallyfor the important department, such as the oil energy information control system in battle field.This system is built up the simulation platform for the measuring the wirelesspropagation channel of wireless communication terminals, and the equivalent measurement ofthe wireless terminals moving in the real environment can be measured in the laboratory bythis system on the different environment to verify the wireless channel fading and quality indifferent of communication interference, moving speed, urban, suburban, mountainenvironment. The integrated test environment of the wireless communication terminals designand acceptance has been applied for measurement. The main word is as follows:Firstly, the simulation platform for the measuring the wireless propagation channel ofwireless communication terminals is built up, including the design of hardware platform andsoftware platform. The intelligent instruments are controlled through program design, and theeffective communication is set up between different equipments. The spectrum analyzer canwork on I/Q mode, and the transmitter radiation can be down conversion to base band. Theplatform is provided for the communication interference and the wireless fading channelsimulation.Secondly, the communication interference are modeled and simulated for the wirelesscommunication terminals. Through the analysis of uniform random number and Gaussianrandom number, a Gaussian noise signal source based on programmable instruments is design.The Gaussian noise signal is generated through modular operation, adopting mix algorithm ofBOXMULLER algorithm and summation algorithm. The noise is changed the frequency bythe linear-phase filter. The communication interference signal is generated from the differenttransformation in the low-pass filter and integrator. Then several common communicationinterferences are design and simulated by the analysis.Then, the channel is modeled and simulated for the moving propagation of wirelesscommunication terminals. Based on the current Doppler, Rayleigh, Rician, log normalchannel model, the proper wireless communication channel models are built up. On the basisof theory analysis for the typical large-scale and small-scale fading channel environmentmodel, the channel environment simulation model is design. Last but not least, the front interface of the simulation system is design by the MFC. Themobile propagation environment wireless channel data base can be setup by MYSQL and thenew measurement data can be stored in the database. The communication performance of thewireless communication terminals in different wireless channel environment can be test.