Beamforming Codebook Segmentation for Broadband Beam Squint Suppression
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Solution Overview
Problem
Conventional hybrid analog-digital beamforming in millimeter-wave and terahertz frequency bands leads to beam squint, reducing signal power and transmission rates due to beam deviation, and existing solutions either fail to effectively suppress this issue or are overly complex.
Innovation Solution
A method involving the division of broadband signals into sub-bands, determination of analog and digital precoding matrices for each sub-band, and formation of a transmission codebook to limit beam dispersion angles, thereby suppressing beam squint and reducing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional hybrid analog-digital beamforming is used in millimeter-wave and terahertz frequency bands, then the system can operate at high frequencies with large bandwidth, but beam squint phenomenon occurs causing beam deviation and signal power reduction
Solution Approach 1:
The broadband signal is divided into multiple sub-bands, with each sub-band processed by a dedicated analog beamforming matrix. This segmentation allows each sub-band to maintain its beam direction within acceptable limits, preventing the beam squint that occurs when a single beamforming matrix is used across the entire broadband spectrum.
2Device complexity
If the bandwidth of each sub-band is increased to cover the entire broadband signal, then the system complexity is reduced, but beam squint suppression performance deteriorates
Solution Approach 1:
The patent determines the bandwidth of each sub-band based on specific parameters including the central direction angle, maximum allowable direction angle deviation, and frequency characteristics. By dynamically adjusting sub-band bandwidth parameters according to these constraints, the system achieves beam squint suppression while maintaining manageable complexity through a closed-form solution for codebook design.
Data Source
AI summary
The present disclosure, which relates to the field of communication technologies, provides a method and a device for codebook determination, a method and a device for signal processing, and a readable storage medium, to improve the effect of suppressing beam squint and reduce the complexity of codebook design. The method includes: dividing a broadband signal into multiple sub-bands; determining a first analog beamforming matrix corresponding to each sub-band; determining a first digital precoding matrix corresponding to each first analog beamforming matrix; and forming a transmission codebook based on each first digital precoding matrix and a first sub-band-related parameter for each sub-band; where a bandwidth of each sub-band meets following requirement: a difference between a first direction angle and a second direction angle is less than a preset threshold.