摘要
文章主要通过Matlab软件中的Simulink工具对OFDM在通信系统中的传输进行仿真、性能进行对比分析。仿真结果表明:在OFDM技术的通信仿真系统中,插入CP对消除系统中由多径效应带来的ISI和ICI有很大效果,并且,对接收信号的还原起了一定作用;经过RS编码后的系统,可明显地看出系统抗误码性能提高了几倍,系统可靠性大大增强;在同等条件下,运用4QAM调制解调技术的系统,其误码性能明显优于16-QAM、64-QAM、128QAM和256-QAM的调制系统;QAM技术比较适合在大信噪比的信道中使用,而QPSK比较适合在小信噪比信道中使用。
In this paper,the transmission of OFDM in the communication system is simulated and the performance is compared and analyzed through the Simulink tool in Matlab software.The simulation results show that in the communication simulation system of OFDM technology,the insertion of CP has a great effect on eliminating the ISI and ICI caused by the multipath effect in the system,and plays a certain role in restoring the received signal.After RS coding,it is obvious that the anti-error performance of the system has been improved several times and the reliability of the system has been greatly enhanced.Under the same conditions,the error performance of 4QAM modulation and demodulation system is obviously better than that of 16-QAM,64-QAM,128QAM and 256-QAM modulation system.QAM technology is more suitable for the use of large SNR channels,while QPSK is more suitable for the use of small SNR channels.
出处
《今日自动化》
2021年第6期162-163,共2页
Automation Today
基金
湖南省自然科学基金项目(2020JJ4327)
湖南科技学院校级科研项目(20XKY051)
湖南科技学院应用特色学科建设项目。
