提出一种近场同频干扰主动抵消通用架构,针对近场同频干扰重建-抵消部分,提出一种"多项式+抽头滤波器"干扰信号建模方式,并采用迭代方法识别非线性模型参数,实现干扰重建和抵消.仿真结果表明,在干扰非线性较高时(功率回退OBO=1.7 dB),相比线性干扰抵消,残留的干扰信号功率降低9.5 dB.此外,所提同频干扰抵消架构对信号帧格式等没有要求,只需将近场设备的输出作为参考信号输入到干扰抵消模块中;所提架构及算法基于迭代,易于工程实现.%A general co-frequency near-field interference active-cancellation structure is proposed. The interference signal is modeled as polynomial and filters, and the iteration method is used for identification of non-linear model parameters, interference reconstruction and cancellation. The simulation results show that the residual interference power is reduced by 9.5dB as compared with linear cancellation when the nonlinearity power is high(OBO=1.7dB). The proposed method has little restriction on frame structure, and the only requirement is to take the output of the near-field device as the reference interference signal into the cancellation module. This proposed interference cancellation structure based on iteration is easy for engineering implementation.
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