多径衰落信道下多音干扰OFDM系统性能分析

发布时间：2019-03-03 11:28

【摘要】：针对无线通信面临的干扰问题,对多径衰落信道下的正交频分复用(OFDM)系统的抗多音干扰性能进行了研究.在给出系统模型的基础上,对经历多径衰落信道后的受干扰接收信号进行分析,计算了有用信号和各干扰信号分量的数学统计特性,并在此基础上推导了系统的误比特率公式.对系统进行了误比特率仿真,仿真结果表明,理论值与仿真结果能很好吻合,增大子载波间隔可减弱多音干扰对系统的干扰效果.另外,当干扰信号功率较大时,全音干扰效果较好;反之则宜集中干扰功率对部分子载波实施干扰.
[Abstract]:Aiming at the interference problem of wireless communication, the anti-multitone performance of orthogonal Frequency Division Multiplexing (OFDM) system in multipath fading channel is studied. Based on the model of the system, the received signal after multipath fading channel is analyzed, and the mathematical statistical characteristics of the useful signal and the components of the interference signal are calculated. On the basis of this, the formula of the bit error rate of the system is deduced. The simulation results show that the theoretical values are in good agreement with the simulation results, and the increase of subcarrier spacing can reduce the interference effect of multi-tone interference on the system. In addition, when the interference signal power is large, the full-tone jamming effect is better; on the contrary, the concentrated interference power should be used to interfere part of the molecular carrier.
【作者单位】：空军工程大学防空反导学院;中国人民解放军95948部队;空军工程大学信息与导航学院;
【基金】：国家自然科学基金资助项目(60971100)
【分类号】：TN929.537

【参考文献】