软件无线电电台的计算机仿真

分析了软件无线电的分层结构,设计了一种软件无线电电台模型,其射频段参数、信道模型、调制方式和信源编码方式等可编程控制。建立了一种软件无线电电台的计算机仿真平台,进行了计算机仿真,验证了软件无线电的一些重要思想和技术。针对AM,SSB,FM,OOK,PSK,QPSK,MSK,FSK,16QAM九种信号,仿真结果表明,在载波频率、调制方式、信道模型等可以根据需要设置的环境下,电台的收发都能达到预期效果。当接收信号的信噪比为20 dB,AM与SSB调制度为0.8,FM的调频指数为3、数字调制的传速率都为2000 b/s时,载波频率的平均检测误差不大于2%,平均调制类型识别正确率不低于96%,模拟调制的平均失真率小于3%,数字调制的平均误码率小于10-5。

The Computer Simulation of Software Radio Station

According to the analysis of software radiors layered architecture,a kind of model of software radio station has been designed, which is programmable to control the parameters of RF circuit, the model of channel, the scheme of modulation, the scheme of encoding and so on. The computer simulation platform having been set up, some of key ideas and technologies of software radio have been tested and verified with computer simulation. Under the environment being reconfigurable by carrier frequency, modulation schemes, channel models and so on according to request, the simulation result shows that not only the receiver but also the transmitter perform well aimed at AM, SSB, FM, OOK, PSK, QPSK, MSK, FSK, and 16QAM. With the SNR of the received signals being 20 dB, the modulation degree of AM and SSB being 0.8, the index of FM being 3 and the bits per second of the digital modulation being 2 000, the mean measure error of carrier frequency is no more than 2% ,and the mean error rate of correct recognizing of modulation schemes is no less than 96 % ,and the mean distortion rate of the signals demodulated from analog modulations is less than 3 %, and the mean error code rate of the signals demodulated from digital modulations is less than 10^-5.