Broadband Signal Codebook Design for Beam Squint Suppression
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Solution Overview
Problem
Conventional hybrid analog-digital beamforming in millimeter-wave and terahertz frequency bands leads to significant beam squint, reducing signal power and communication system transmission rates due to beam deviation, and existing methods either fail to effectively suppress this issue or are excessively complex.
Innovation Solution
The method involves dividing broadband signals into sub-bands, determining analog and digital precoding matrices for each sub-band, and forming a transmission codebook to ensure the difference between direction angles remains within a preset threshold, thereby minimizing beam squint and optimizing antenna gain.
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 patent divides the broadband signal into multiple sub-bands, with each sub-band having a bandwidth that satisfies a specific inequality relationship. This segmentation allows the system to process different frequency components separately, reducing the beam squint effect within each sub-band while maintaining overall high data transmission rates.
Solution Approach 2:
The patent dynamically adjusts the bandwidth of each sub-band based on the inequality relationship involving the center frequency and bandwidth parameters. This dynamic adjustment ensures that the beam deviation remains within acceptable limits while optimizing the signal transmission rate for different frequency conditions.
2Productivity
If the bandwidth of each sub-band is increased to improve data rate, then the transmission rate increases, but the beam squint effect worsens due to larger frequency deviation
Solution Approach 1:
By segmenting the broadband signal into multiple sub-bands with controlled bandwidths, the patent achieves high overall data rates while keeping the bandwidth of each individual sub-band small enough to minimize beam squint effects. The sum of sub-band bandwidths provides high productivity while each sub-band's limited bandwidth reduces harmful beam deviation.
Solution Approach 2:
The patent applies different bandwidth characteristics to different sub-bands based on their center frequencies. Each sub-band is designed with local quality optimized for its specific frequency range, ensuring that beam squint is minimized locally while the aggregate system achieves high data transmission rates.
3Reliability
If existing methods are used to solve beam squint, then beam squint suppression may be achieved, but the system complexity becomes excessively high
Solution Approach 1:
The patent changes the key parameter from designing complex beamforming matrices to simply controlling the bandwidth parameter of each sub-band. By adjusting the bandwidth to satisfy the inequality relationship, the system achieves effective beam squint suppression while maintaining simple codebook design and avoiding excessive system complexity.
Data Source
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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.