Dynamic channelization method based on non-uniform filter bank

Abstract

Aimed at the fact that a plurality of sub-band signals exist in a receiving bandwidth in a complex electronic environment, and the number, positions and bandwidths of sub-band signals are time-varying, the invention provides a dynamic channelization method based on a non-uniform filter bank. The method comprises the following steps: firstly, determining the number of filter sub-channels by the minimum protection bandwidth among the signals, and calculating a prototype filter meeting an approximate complete reconstruction structure; secondly, determining the position of a received signal by calculating the energy of each sub-channel, combining the corresponding sub-channels, and combining the non-uniform filters to extract sub-band signals; and when the signal is dynamically changed, obtaining signal position information by detecting the energy of the signal, and generating a corresponding non-uniform filter bank, so that dynamic channelization processing is realized. Through MATLAB simulation, the effectiveness of the method is verified.

Description

technical field [0001] The invention relates to a dynamic channelization method based on a non-uniform filter bank, which belongs to the technical field of software radio. Background technique [0002] In the modern electronic warfare environment, the signals are generally dense and complex, and the frequency spectrum occupied is getting wider and wider, which puts forward higher requirements for wideband digital receivers to receive signals accurately. [0003] With the rapid development of software radio in the field of communication and other related fields of radio engineering, channelization in the field of communication has become one of the key technologies of software radio systems and wideband digital receivers. Depending on the sub-band signal bandwidth and frequency band position distribution, different channelization techniques can be used to receive and process the IF signal. If the bandwidth of each sub-band signal is equal and the signals are arranged at equa...

AI Technical Summary

Problems solved by technology

[0004] Among the methods for designing non-uniform filter banks, there are not many methods that can design non-uniform filter banks with linear phases. A more commonly used method for designing linear phases is based on direct structure design, that is, each linear phase The phase analysis and synthesis filters are designed separately, but this method has strict restrictions on the sampling rate, and the cascaded structure in this design method makes the designed system have a large delay

When the general non-uniform filter bank design method based on approximate complete reconstruction meets the requirements of complete reconstruction and high stopband attenuation, the coefficient length of the prototype filter will be very large, which will greatly increase the amount of calculation and the consumption of hardware resources.

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