论文标题
OFDM系统在多径褪色通道上的不同环状前缀长度的性能
Performance of OFDM System against Different Cyclic Prefix Lengths on Multipath Fading Channels
论文作者
论文摘要
正交频施加多路复用（OFDM）是一种传输技术，它使用了几个垂直于彼此（正交）的子载波频率（多载波）。这种OFDM调制技术有效地消除了由多径褪色的影响引起的通道上的隔膜间干扰（ISI）。为了克服这种弱点，OFDM使用插入其传输中的后卫间隔（环状前缀）。本文使用MATLAB分析了不同循环前缀长度对OFDM性能的影响。在这里，对于不同数量的订户，循环前缀长度作为主要参数的变化。同时，在接收器上获得的位错误率（BER）和信号噪声比（SNR）值用于查看系统的性能。基于我们的仿真结果，使用循环前缀长度为1/4，快速傅立叶变换（FFT）尺寸为512。
Orthogonal Frequency Division Multiplexing (OFDM) is a transmission technique that uses several subcarrier frequencies (multicarrier) that are perpendicular to each other (orthogonal). This OFDM modulation technique effectively eliminates Intersymbol Interference (ISI) on a channel caused by the effects of multipath fading. To overcome this weakness, OFDM uses a guard interval (cyclic prefix) inserted in its transmission. This paper analyses the effect of different cyclic prefix lengths on OFDM performance on multipath channels using Matlab. Here, the cyclic prefix length as the main parameter is varied for the different number of subscribers. Meanwhile, Bit Error Rate (BER) and Signal Noise Ratio (SNR) values obtained at the receiver are used to see the system's performance. Based on our simulation results, the best value of BER is obtained using a cyclic prefix length of 1/4 with a Fast Fourier Transform (FFT) size of 512.
