摘要
OFDM(正交频分复用)是一种多载波宽带数字调制技术,它能有效地克服传输中的多径干扰和消除码间串扰,适合于高速率的地面信道视频传输.就OFDM技术进行了较为详尽的分析,并对OFDM的传输特性进行了基于FFT算法实现M atlab软件模拟及模拟结果分析.仿真中采用16QAM和QPSK2种调制进行系统仿真比较分析,结果表明,采用QPSK调制解调OFDM系统的性能优于采用16QAM调制解调的OFDM系统.
Orthogonal frequency division multiplexing （OFDM） is a multi-carrier wideband digital modulation technique. OFDM has a good performance in dealing with multi-path disturbance and inter symbol interference （ISI）, suitable to high-data-rate digital terrestrial video broadcasting transmission. This paper presents an overview of OFDM technique and its implementation scheme with FFT algorithm running on Matlab. The results of computer simulation are also discussed. The OFDM system that adopts QPSK modulation is better than 16QAM modulation.
出处
《应用科技》
CAS
2006年第6期34-36,共3页
Applied Science and Technology
