基于余弦调制滤波器组的动态信道化方法

Dynamic channelization using cosine modulated filter banks

针对均匀宽带数字信道化接收机无法动态适应信号瞬时带宽变化的问题,提出了基于余弦调制滤波器组的动态信道化接收机结构设计,采用合成处理矩阵对信号进行近似重构。分析了原型滤波器和近似完全重构余弦滤波器组结构的理论和设计方法。在讨论了一种采用余弦调制滤波器组结构的均匀信道化设计方法的基础上,根据不同子带信号所需抽取的倍数不同的特点,设计了非均匀信道化结构,并分析了此结构的第4类离散余弦变换的快速算法,当信号动态变化时,根据子信道能量检测环节更新合成矩阵就可以完成对新信号的重构。最后,通过仿真验证了所提算法的有效性。

The uniform wideband digital channelized receiver can not dynamically adapt to the changes of the instantaneous signal. To resolve this problem, a structural design of dynamically channelized receiver is proposed based on Cosine-Modulated filter banks. The synthetic processing matrix is used to complete near perfect reconstruction of the signal. The theory and design methods of filter prototype and the near perfect reconstruction of cosine modulated filter bands are analyzed. According to the discussion of a channel design method using uniform cosine modulated filter, a non-uniform channelized structure is designed based on the factor that different sub-band signal extraction requires different multiples. The fast algorithm of the fourth discrete cosine transform of the non-uniform channelized structure is discussed. The new signal can be reconstructed by changing the synthetic matrix based on the subchannel energy detection link when the signal dynamically changes. Simulation results verify the effectiveness of the proposed dynamic channelized receiver structure.