Variable Bandwidth Frequency-Spatial Filter Design
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively processing broadband signals due to increased interference and noise, particularly with limited antenna arrays and FFT resolution, which restricts the ability to form and adjust beam bandwidths efficiently.
Innovation Solution
A method and apparatus for designing a frequency-spatial filter with variable bandwidth, utilizing M number of FFT channel blocks generated from array antenna inputs, combining channels based on frequency and spatial bandwidth parameters, and outputting combined channels to achieve a simple, efficient, and adaptable filtering system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital beam formation is used for spatial filtering, then spatial interference can be removed, but the beam bandwidth cannot be easily adjusted due to limitations of the number of antennas
Solution Approach 1:
The patent implements dynamic beam bandwidth adjustment by making the spatial filter coefficients adjustable based on desired beam width parameters. The spatial filter can dynamically change its filtering characteristics to form beams of different bandwidths without requiring physical reconfiguration of the antenna array, thus achieving adaptability while maintaining structural simplicity.
Solution Approach 2:
The invention changes the parameters of the spatial filter (specifically the filter coefficients and bandwidth parameters) to achieve different beam bandwidths. By adjusting parameters such as the spatial bandwidth variable parameter and frequency bandwidth variable parameter, the system can flexibly control beam characteristics without altering the physical structure of the antenna array.
2Productivity
If base bandwidth signal processing is performed on broadband signals from all directions, then all received signals can be processed, but interference and noise increase
Solution Approach 1:
The patent applies local quality by directing the spatial filter to process signals from specific directions of interest while filtering out signals from other directions. The spatial filter assigns different weights to signals from different spatial locations, enhancing the quality of desired signals while suppressing interference and noise from other directions, thus achieving selective signal processing.
3Measurement precision
If the number of array antennas is increased to improve beam formation, then beam bandwidth control improves, but the structure becomes more complex and space requirements increase
Solution Approach 1:
The patent uses dynamic parameter adjustment in the spatial filter to achieve precise beam bandwidth control without increasing the number of antennas. By making the spatial filter coefficients and bandwidth parameters dynamically adjustable, the system can achieve fine-grained control over beam characteristics using the existing antenna array configuration, avoiding the need for additional antennas and the associated space requirements.
Data Source
AI summary
Provided herein is a method and apparatus for realizing a frequency-spatial filter with variable bandwidth, the method including generating M number of FFT channel blocks having N number of channels by performing an N point FFT (Fast Fourier Transform) processing using M number of array antenna inputs; combining some of the N number of channels of each FFT channel block according to a frequency bandwidth variable parameter value; combining some of spatial response vector channels in a combined channel of each FFT channel block according to a spatial bandwidth variable parameter value; and combining all the channels and outputting the same.