Hybrid Beamforming Reference Signal Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting reference signals for beamforming, particularly in massive MIMO environments, where existing methods require separate feedback for analog and digital beamforming, leading to increased overhead and complexity.
Innovation Solution
A method for transmitting and receiving reference signals using a 2D array antenna, where a base station selects subset elements to form directional and omni-directional beams, allowing for hybrid beamforming by coupling analog and digital beamforming based on channel state information and gain differences between reference and analog beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate feedback for analog and digital beamforming is used, then beamforming performance can be improved, but feedback overhead and system complexity increase
Solution Approach 1:
The patent combines analog beamforming and digital beamforming into a unified hybrid beamforming framework. The base station transmits reference signals through multiple beams formed by different antenna subsets, and the user equipment provides unified feedback that captures channel state information for both analog and digital beamforming simultaneously, eliminating the need for separate feedback procedures
Solution Approach 2:
The reference signal transmission mechanism serves multiple functions: it enables channel estimation for both analog and digital beamforming, provides basis for precoding matrix selection, and supports hybrid beamforming optimization all through a single standardized procedure, making the system more versatile while reducing overhead
2Measurement precision
If 2D array antenna with subset selection is used, then beamforming accuracy is improved, but antenna element utilization complexity increases
Solution Approach 1:
The 2D array antenna elements are segmented into multiple subsets, where each subset corresponds to a specific beam direction. By selecting appropriate subsets for different beams, the system achieves high beamforming accuracy for specific directions while maintaining manageable complexity through structured organization of antenna elements
Solution Approach 2:
Different subsets of antenna elements are optimized for different spatial directions, with each subset providing high-quality beamforming performance in its specific direction. This local optimization approach allows the system to achieve high beamforming accuracy in multiple directions simultaneously without requiring all elements to be optimized for all directions
Data Source
AI summary
A method of transmitting a reference signal for a hybrid beamforming in a base station of a wireless communication system according to one embodiment of the present invention may include selecting first subset elements arrayed in a first direction from a plurality of antenna elements included in a 2D array antenna of the base station and transmitting a first reference signal through a reference beam formed by the first subset elements, wherein a first cross-section for the first direction of the reference beam corresponds to a directional beam and wherein a second cross-section for a second direction crossing the first direction of the reference beam corresponds to an omni-directional beam.