摘要
正交频分复用(OFDM)技术在高速数据传输中得到了广泛的应用,尤其在无线接入和移动通信中应用前景非常广泛。无线衰落信道使得通信系统在传输过程中出现符号间干扰和信道干扰,严重影响信道质量,而OFDM是一种多载波数字调制技术,在无线衰落信道下具有较好的传输特性。运用Matlab构建OFDM系统,并加入自适应功率和比特分配算法,通过具有高斯白噪声和频率选择性信道,观察在不同信噪比条件下系统误码率是如何变化的。给出仿真结果,从而分析出系统在不同调制方式下的性能。仿真结果表明,OFDM系统能抗多径衰落,而且具有良好的误码性能。
The technology of Orthogonal Frequency Division Multiplexing（ OFDM） has been applied widely in the transmission of high -speed data,especially in wireless access and mobile communication, where OFDM has very wide perspectives. The mobile fading channel leads to inter - symbol interference and inter channel interference, which severely influence the performance of communication. OFDM is a multi - carrier modulation technique which has better performance in the mobile fading channel, then OFDM simulation system is constructed on Matlab platform furthermore the power and bit load arithmetic is adopted in the simulation. The bit error rate under different SNR is presented ultimately. At the same time the result of simulation is given. At last, the performance of OFDM system using different modulation modes is analyzed. The results indicate that OFDM system can reduce multi - path fading and has good BER performance.
出处
《现代电子技术》
2009年第17期26-29,共4页
Modern Electronics Technique
