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多径衰落信道下多音干扰OFDM系统性能分析

Keywords: 正交频分复用,多径衰落信道,多音干扰,误比特率

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Abstract:

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.

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