摘要
正交频分复用(OFDM)技术是下一代移动通信的核心技术之一。重点研究了多径瑞利衰落信道下最大多径时延对基于OFDM技术的通信系统性能的影响。根据OFDM基本原理构建了一个OFDM无线通信基带系统仿真模型,信道带宽为15MHz,调制方式为16-QAM,编码方式采用码率为1/2的卷积,模型采用了60个子载波,并插入了循环前缀。分析了系统抗多径干扰的性能,比较了不同信道下系统的误码率,以及不同的保护间隔长度下系统的误码率。表明在瑞利衰落信道下OFDM技术具有良好的抗多径干扰的性能。
Orthogonal frequency division multiplexing（OFDM） is one of the key technologies for next-generation mobile communications.The influence on the performance of the base-band communication system based on OFDM technology in multipath Rayleigh fading channels is emphatically investigated.According to the basic theory of the OFDM technology,the paper creates an OFDM base-band simulation model of the wireless communication system,with bandwidth of 15MHz,modulation mode of 16-QAM,convolution code rate of 1/2,subcarrier number of 60,and cyclic prefix is inserted.The performance of the anti-multipath-interference of the OFDM system is analyzed,BERs of the system between different channels,and BERs between different Guard Intervals are compared.The result of the simulation shows that OFDM technology has superior performance of anti-multipath-interference.
出处
《计算机仿真》
CSCD
2008年第7期105-108,共4页
Computer Simulation
