Dynamic channelization using cosine modulated filter banks
Tao Chen · Journal of Jilin University · 2013
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.