基于非均匀滤波器组的动态信道化滤波
doi: 10.3724/SP.J.1146.2006.00455
Dynamic Channelization Based on Nonuniform Filterbanks
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摘要: 针对中频带宽内存在多个子带信号，其个数、位置和带宽具有时变性的情况，该文提出一种基于非均匀滤波器组的动态信道化滤波的方法：由事先给定的子带信号间的最小保护间隔确定均匀滤波器组的子信道数目并设计相应的余弦调制滤波器组；由子带信号的位置分布求得非均匀处理矩阵，并由此直接合并余弦调制滤波器组的对应的相邻子信道以构成非均匀滤波器组；当信号动态变化时，只要根据新状态下的子带信号位置分布更新非均匀处理矩阵，就能完成新信号的信道化接收；利用不同子带信号的抽取因子之间的大小关系提前部分抽取因子以降低实现过程的运算量。仿真实例验证了新方法的有效性。Abstract: Based on the fact that there exist several subband signals in the received bandwidth, whose number, band location and bandwidth are time-variant, this paper presents an efficient method of dynamic channelization based on nonuniform filterbanks. The number of subchannels of the uniform filterbank is firstly determined by the given minimal guard bandwidth, and then a corresponding cosine-based filterbank is designed. A nonuniform matrix is derived in terms of band location of every subband signal, and then a nonuniform filterbank can be constructed through directly merging the adjacent subchannels of the uniform filterbank according to the nonuniform matrix. When subband signals dynamically change, channelization can be implemented as long as updating the nonuniform matrix in terms of band location of new subband signal. The computational complexity of implementation architecture can be reduced by the use of relationships between decimation factors of different subband signals. Computer simulations illustrate new method validity.
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