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阐述了OFDM系统的基本原理及保护间隔(GI)对系统的影响.首先就保护间隔(GI)参数在接收机干扰问题上起到的作用进行了讨论.然后计算了保护间隔参数的最佳值,结果表明它们对最大延迟有很强的依赖性.同时对多径衰落和加性高斯白噪声同时存在的QPSK调制情况进行了仿真,从而分别得出了GI、信噪比(SNR)、最大传播延迟和副载波数量与误码率的关系.
The basic principle of OFDM system and the influence of guard interval (GI) on the system are described.First, the role of guard interval (GI) parameters in receiver interference is discussed.And then, the optimal value of guard interval parameter , The results show that they have a strong dependence on the maximum delay.At the same time, simulating the coexistence of multipath fading and additive white Gaussian noise QPSK modulation, resulting in GI, signal to noise ratio (SNR), the maximum Propagation Delay and Number of Subcarriers vs. Bit Error Rate.