3 results about "Stop band attenuation" patented technology

The application discloses a method, device and equipment for designing a channel filter and a computer storage medium, and relates to the technical field of wireless communication. The method comprises the following steps: acquiring a signal bandwidth, a baseband sampling rate, a frequency of adjacent channel interference, a noise power spectral density of adjacent channel interference and a noise power spectral density of a signal; calculating a normalized passband cutoff frequency, a normalized stopband cutoff frequency and a stopband attenuation according to the acquired parameters; determining a channel filter coefficient according to the normalized passband cutoff frequency, the normalized stopband cutoff frequency and the stopband attenuation, and obtaining a channel filter corresponding to the channel filter coefficient; inserting a preset value into the channel filter coefficient to obtain a target channel filter coefficient, updating the channel filter, and obtaining a target channel filter. The embodiment of the application realizes the design of a steep transition band channel filter while reducing the structural complexity.

This application provides an adaptive suppression method, system, storage medium, and program product for inter-band interference of a multi-band common-aperture antenna, relating to the field of communication radio frequency signal processing technology. The method includes: acquiring the broadband radio frequency receiving assembly signal received by the multi-band common-aperture antenna; extracting the target coupling signal through a directional coupler; inputting the target coupling signal into a preset duplex frequency division network to filter out the first band signal of the desired service radio frequency carrier and extract the second band signal of the cross-band intermodulation leakage component; continuously sampling the second band signal using a logarithmic detector circuit to obtain a transient power level sequence and determine the power mutation gradient; dynamically attenuating and matching the current transient power level and power mutation gradient using a preset adaptive suppression function to obtain the target stopband attenuation coefficient; converting the target stopband attenuation coefficient into a digital-to-analog bias control voltage, and using the digital-to-analog bias control voltage to perform target adjustment operation on the adaptive stopband suppression circuit.

This invention relates to the field of filter technology, and particularly to a design method, system, device, and medium for a quasi-completely reconstructed filter bank. The method first uses a generalized monotonic asymptotically saturated function as the initial value of a prototype filter, substituting it into the filter bank model for optimization to obtain a baseline fully reconstructed prototype filter. Then, a transition band adjustment parameter is introduced to perform an analytical mapping transformation on the amplitude-frequency response of the baseline fully reconstructed prototype filter, resulting in a fully reconstructed prototype filter with optimized transition band. Finally, combined with a determined number of filter bank channels and the polyphase decomposition length of the prototype filter, a quasi-completely reconstructed prototype filter is obtained through frequency domain sampling and transformation processing, which is then modulated to obtain a quasi-completely reconstructed filter bank. This method, by introducing a generalized monotonic asymptotically saturated function as the initial value of the prototype filter and combining it with the analytical mapping mechanism of the transition band adjustment parameter, significantly improves stopband attenuation performance and increases the efficiency of prototype filter coefficient generation while ensuring quasi-complete reconstruction.