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A software-based simulation platform for testing the communication link

Simulation data, the figure shows the communication error rate with signal to noise ratio curve. 5 ADS-based loop simulation platform for testing by the previous introduction, has achieved a pure software simulation of the communication error rate test, in the simulation noise signal is generated by the software. In order to realize the true situation of the simulation, simulation of communication links must be some of the modules replaced in the actual equipment and facilities, called loop simulation. If you only need to measure the RF part of the introduction of noise interference on bit error rate, such as the moderating effect of testing equipment, you can figure four shows,[link widoczny dla zalogowanych], the user information of coding and modulation in software until the software simulation of the RF signal generated. Section of the RF signal generated by the software simulation NumSymsB0! [E a 4 avjme = 8'Sym-Ltrlql ~ Oef ~ urtNumerlcStop = DFsf00SiertSymsFfit a ~ vql_fre port = 05/Sym. hmeDefllJIfm from Stnrt; 0us at cSeplas a 10} Fjre port = 70MHzDefg ~ It1i shirt StopDsto0us at clstep = Hsvm-FBtE'Slimpills】 RFfre ~ l = 8385MHzDllftlui! Seel? l = 234587lsi00 = (NumSyms'SltlrtS ~ msl'saerT $! epL0 A freQ: ~ F-freqr at q0utVnr = Btr at Se0es ・ 0FstO mouth lstop '{eeGa ... a'uee Figure 2ADS BER test in simulation PoIOt port 0f; b from r0nNBw: / Sym} meSvstemT ~ pe = population PSKESIVer: Port 1E ... OrNcBEsOverNOR Day na Day = ng12NumSw0sF0rEsOvllrN0: 7126 China Measurement Technology in September 2007 of a 11E-1 2E IE curse of a very IE ~ 3SymbolErrorRate ~--'::::::::::::: 2I :::......._,[link widoczny dla zalogowanych],: \ ..., +. .024681012 Figure 5, a radio frequency of the error rate of a test EsOverNo (dB) Figure 3 BER test data so the data downloaded into the microwave signal source, Control microwave signal source to generate the real signal, and the road through the device will interfere with the signal to join, and then collected by a vector signal analyzer, and finally turn the signal back to the collected statistical error rate of software simulation. diagram software parts are gray . Figure 4 BER RF testing of a radio frequency in the RF and IF if you need to introduce some noise in real devices can be used instead of the next drive backup software simulation,[link widoczny dla zalogowanych], and through the vector signal analyzer collected from the IF signal back to software simulation shown in Figure 5. Similarly, if you want to test the baseband demodulation and A / D conversion part of the impact of noise on bit error rate, you can A / D conversion after the logic analyzer with a digital signal acquisition will give the software to do back Finally,[link widoczny dla zalogowanych], decoding and error rate statistics, as shown in Figure 6. From the above we can see that loop through the ADS platform, simulation, testing and simulation will be fully integrated together, as long as the equipment and resources, can achieve all aspects of the physical and the exchange of software modules to achieve more complex and rich test. Figure 6 RF - Digital Signal 6 Conclusion BER measurement can be seen through the introduction of the front, ADS platform to build software-based communication error rate test chain Road and the use of common instruments to achieve the semi-physical simulation, the required development effort is very small, and the concept is clear, easy testing, greatly reducing development costs. References 【1】 Cai Jianming. Satellite Communication System 【M】 . Beijing: People's Posts and Telecommunications Press, 1994. [2] Agilent.Test & MeasurementCatalog [S] .2005. 【3】 Chen Guangfu, Hou, et al. modern test technology [M】. Chengdu: University of Electronic Science and Technology Press, 2002. [4 ] BlahutRE. error control codes 【M】 theory and practice. Guangzhou: South China University of Technology Press, 1990.f5】 Qin Shuren, et al. intelligent control of virtual instrument system - Principle and Implementation 【M】. Beijing: Science Press, 2004.f6] Tangbao Ping,[link widoczny dla zalogowanych], Yin Aijun, Zhouzhuan De, et al. Qin model based development system of virtual instruments】【J. China Mechanical Engineering, 2004,6 (11) :1018-1021.

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