非线性盲辨识补偿处理的宽带超外差接收机

发布时间：2018-05-01 18:03

本文选题：超外差接收机 + 盲辨识补偿　；参考：《信号处理》2017年09期

【摘要】：提出了一种基于非线性盲辨识补偿处理的新型宽带超外差接收机。在时域,分别提取接收前端输出信号的大信号成分(大功率频率分量)和小信号成分(主要包含非线性失真分量),并以大信号的非线性模型与小信号的残差平方和最小作为其非线性行为模型参数的辨识准则,利用加权迭代改善算法实现模型参数的自适应提取和更新,最后在线实时地对接收机输出信号进行数字域后补偿处理。实测结果表明,在同时多信号接收的情况下,该非线性盲辨识补偿处理可将整机的无杂散失真动态范围提高超过20 dB,极大地提高了在强干扰存在时对微弱信号接收与检测的能力。
[Abstract]:A novel wideband ultraheterodyne receiver based on nonlinear blind identification and compensation processing is proposed. In time domain, The large signal components (high power frequency components) and small signal components (mainly including nonlinear distortion components) of the received front-end output signal are extracted, respectively. The nonlinear model of large signal and the sum of residual square of small signal are taken as the minimum. In order to identify the parameters of its nonlinear behavior model, The weighted iterative improvement algorithm is used to realize the adaptive extraction and updating of the model parameters. Finally, the digital domain post-compensation processing of the receiver output signal is carried out in real time. The experimental results show that, in the case of simultaneous multi-signal reception, The nonlinear blind identification and compensation process can improve the dynamic range of the whole machine without spurious distortion by more than 20 dB, and greatly improve the ability to receive and detect weak signals in the presence of strong interference.
【作者单位】：华中科技大学电子信息与通信学院;武汉光电国家实验室(筹);
【基金】：国家自然科学基金项目(11475067) 湖北省科技支撑计划项目(2015BCE055) 中央高校基本科研业务费专项资金资助(2015ZDTD017,2017KFXKJC012) 脉冲强磁场国家重大科技基础设施开放共享课题(2015KF17)支持
【分类号】：TN851

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