摘要
介绍了一种正交多载波数据传输技术—正交频分复用(orthogonal frequency division multiplexing,OFDM)技术,主要研究了OFDM技术的基本原理及其关键技术,讨论了自适应技术在OFDM系统的应用,进一步具体分析了MPSK和MQAM调制方式在OFDM系统中的影响。使用MATLAB软件进行仿真,并对各调制方式在不同子载波数时的信道特性和误码率性能进行分析。自适应OFDM系统中,应根据信道的衰落程度、信道流量等参数动态的改变调制方式,从而提高系统的频谱利用率和信息传输速率。
This paper introduces the technology of transmission data in orthogonal carrier each other orthogonal frequency division multiples, discusses on the main principle based on OFDM modulation and demodulation and the key technology, discusses the adaptive technique in OFDM system, and discusses MPSK and MQAM based on sub-carrier in OFDM system. Simulating with MATLAB, analyzes the error bit rate and the characteristics of wireless channel with difference sub-carrier. The results indicate that in OFDM adaptive modulating technique system, modulation has to be changed with the change of wireless channel, and it can improve the frequency utilization efficiency and the rate of data of the system.
出处
《国外电子测量技术》
2009年第6期24-27,共4页
Foreign Electronic Measurement Technology
关键词
自适应技术
OFDM
MPSK
MQAM
调制
adaptive technique
orthogonal frequency division multiples
MPSK
MQAM
modulation
