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目前,2.4 GHz非授权频段越来越拥挤,使得工作在此频段下的WLAN系统很容易受到窄带干扰的影响。针对这种情况,主要研究窄带干扰环境下OFDM通信系统的性能。通过理论分析和仿真可以得到,在窄带干扰比较严重的环境下,OFDM通信系统性能急剧下降。当干扰信号的中心频点不是OFDM符号基本频率的整数倍时,这一点尤其明显。因此,在窄带干扰比较严重的场合,必须要采取一定的抗干扰措施来保证系统的正常工作。
At present, the 2.4 GHz unlicensed band is increasingly crowded, making WLAN systems operating in this band susceptible to narrowband interference. In view of this kind of situation, mainly studies the performance of OFDM communication system under the environment of narrowband interference. Through theoretical analysis and simulation, we can get that the performance of OFDM communication system drops sharply in the environment with more serious narrow-band interference. This is especially true when the center frequency of the interfering signal is not an integral multiple of the fundamental frequency of the OFDM symbol. Therefore, in the case of narrow-band interference more serious, we must take some anti-jamming measures to ensure the normal operation of the system.