基于小波变换投影的卫星动态信道化接收技术研究

Research on Satellite Dynamic Channelized Receiving Technology based on Wavelet Transform Projection

针对低信噪比环境下宽带卫星通信中的动态信道化问题,详细分析了基于复指数调制滤波器组的信道化处理基础结构,提出基于小波变换投影动态信道化实现方案。通过小波变换投影,将不同小波平移量下的小波检测系数投影到同一频域中,使得判决的曲线更加平滑。在低信噪比条件下,所提算法的信道化处理结果相比其他算法更加准确。通过对比分析不同信噪比条件下的信道化处理结果重构成功率以及重构误差,证明了算法的可行性,为下一代信道化接收机实现提供了参考。

This paper explores the dynamic channelization of wideband satellite communications under a low signal-to-noise ratio environment.Firstly,the infrastructure of channelization processing based on complex exponential modulation filter banks is analyzed in detail.Then,a dynamic channelization scheme based on wavelet transform projection is proposed.Through the projection of wavelet transform,the wavelet detection coefficients under different wavelet translation are projected into the same frequency domain,which makes the curve of sub-band signal detection smoother.Under the condition of low signal-to-noise ratio,the channelization processing result of the proposed algorithm is more accurate than other algorithms.Through comparing and analyzing the reconstruction success rate and reconstruction error of the channelized processing results under different signal-to-noise ratio,the feasibility of the algorithm proposed is proved,which provides a reference for the next generation of channelized receiver.