High-Resolution Wideband Digital Channelizer with Adjustable Reconstruction Performance

Digital channelizers have been considered as the key technique for extraction and recon struc tion of multi-band signals, in which the complex-exponential modulated filterbank (CEMFB) is corroborated to be an effi cient implementation structure. Previous works for designing filterbanks were generally difficult to adapt to the high-order scenarios or simply assumed the perfect reconstruction (PR) condition which resulted in high implementation costs. Considering these problems, this paper proposes an efficient design method of CEMFB based channelizers with adjustable reconstruction performance. We reanalyze the PR constraints and formulate an optimization problem based on the improved quadratically constrained quadratic programming (QCQP) model. Simulation results indicate that the proposed method can effectively achieve arbitrarily adj usta ble reconstruction performance, as well as high channel resolution and high stopband attenuation. Therefore, the filter length can be reduced significantly, which brings remarkable reduction in implementation costs.