Design of Digital Channelizer Based on Source Number Estimation

Abstract

Digital channelizer is used to separate the sub-band signals contained within a wideband intermediate frequency (IF) received signal. This paper presents a structure of digital channelizer which is built upon estimation of the sub-band signal number. The proposed structure is designed by employing nonuniform filter banks (NUFBs), which are implemented by merging the adjacent sub-branches of the perfect reconstruction (PR) cosine modulated filter banks (CMFBs). Using source number estimation algorithm, the estimated value of sub-band number can be obtained. By energy detection, the energy characteristic of the analysis filter banks (AFBs) can be acquired and another value of sub-band number is calculated. Comparing the estimated value and the calculated one, we can evaluate whether the design of the AFB is suitable for the received signal. The structure of digital channelizer proposed by this paper provides a potential way to channelize the unknown signal and suggests a solution for the dynamic channelizaiton. A design example is also presented to demonstrate the feasibility and simplicity of this method.