Method and device for generating prototype filter, channelization method and spaceborne communication device

Abstract

The invention provides a prototype filter generation method and device, a channelization method and a spaceborne communication device, and the prototype filter generation method comprises the steps: determining a parameter optimization cost function of a prototype filter of a cosine modulation filter bank based on an aliasing distortion error model of the cosine modulation filter bank with any channel number, wherein the parameter optimization cost function enables the generated ultra-high-order prototype filter to meet an approximate perfect reconstruction condition; performing global iterative optimization on the parameter optimization cost function until the fitness of the optimal solution obtained by the current round of optimization reaches a preset threshold; and performing local optimization of a parameter optimization cost function by taking the optimal solution as an initial value to obtain filter parameters of the prototype filter. According to the method, out-of-band leakageand spectrum aliasing distortion between adjacent sub-bands and non-adjacent sub-bands are suppressed, the calculation complexity of solving a mass parameter planning problem is reduced, and the generation efficiency of the ultra-high-order prototype filter is improved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a method and device for generating a prototype filter, a channelization method and a satellite-borne communication device. Background technique [0002] M The channel non-uniform biorthogonal cosine modulation filter bank (CMFB) can perform uniform dual modulation on the linear-phase FIR prototype filter based on the IV discrete cosine transform, and realize the fine-grained flexible decomposition of the wideband complex spectrum, and through several subbands The comprehensive reconstruction of the complete multi-scale fully coherent inversion of specific waveforms. Therefore, the CMFB structure is widely used in broadband satellite communication, radar cognitive countermeasures, intelligent voice and image processing and other fields due to its advantages of low resource overhead and high flexibility of waveform analysis. Taking the covert communication of next-gener...

AI Technical Summary

Problems solved by technology

When dealing with the above design difficulties caused by the increase in the number of channels, although the former has faster convergence performance, it is easy to fall into local optimum; while the latter has good global optimization ability, but the convergence speed is limited

In addition, the existing schemes usually only consider the suppression and cancellation of the spectral aliasing effect between adjacent subbands when optimizing the parameter design of the prototype filter

However, in fact, when the receiver is channelized on a large scale, the energy leakage caused by the non-ideal channel isolation of the remote user will also be folded to the subband of the target user during the multi-sampling rate switching process of the CMFB. Causes spectral aliasing and distortion between subbands, leading to deterioration of system bit error rate performance

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