Nonlinear Distortion Suppression in Cooperative Jamming Cancellation System
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摘要: 在同时同频扰中通(CJ)系统中，干扰发射机中的功率放大器(PA)工作于非线性区内，导致近端接收机接收到的自干扰(SI)信号中包含大量非线性分量。该文针对非线性干扰抑制这一问题，在接收端建立干扰非线性模型，并进行非线性模型参数估计，最终在接收信号中减去重建的非线性干扰信号，以抑制同时同频扰中通系统中的非线性干扰。仿真与实验结果表明，该文所提方法针对同时同频扰中通场景中存在残余频偏的情况下，能够对非线性干扰进行有效抑制，验证了该方案的有效性与可行性。Abstract: In Cooperative Jamming (CJ) system, the Power Amplifier (PA) in the jamming transmitter works in nonlinear region, which results in a large number of nonlinear components in the Self-Interference (SI) signal received by the near-end receiver. To solve the problem of nonlinear distortion suppression, a nonlinear model is established at the receiver. Then, the reconstructed nonlinear signal based on the estimated parameters is subtracted from the received signal to suppress the nonlinear interference in CJ. Simulation and experimental results indicate that the nonlinear suppression scheme proposed in this paper can further suppress the nonlinear interference under the residual frequency offset in CJ, and verify the effectiveness and feasibility of the proposed scheme.
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