Sparse Antenna Array Beam Management for Frequency Reuse
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Solution Overview
Problem
Existing communication systems face challenges in achieving high frequency reuse and signal quality in satellite communications due to limitations in beamforming and MIMO techniques, particularly when using sparse antenna arrays.
Innovation Solution
The use of large, sparse antenna arrays with unevenly distributed antennas and geometrically-informed MIMO techniques to form both wide and narrow communication beams, allowing for efficient frequency reuse and improved signal quality by dynamically adjusting beam coverage areas based on terminal utilization and movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wide communication beams are used to cover large geographic regions, then coverage area is improved, but signal quality and frequency reuse capability deteriorate
Solution Approach 1:
The patent segments the wide coverage area into multiple narrower beams, each targeting specific geographic regions or terminals. This segmentation allows the system to maintain broad coverage while improving signal quality through focused beamforming, resolving the contradiction between coverage area and signal quality.
2Reliability
If narrow communication beams are used to improve signal quality, then signal quality is improved, but coverage area and system complexity increase
Solution Approach 1:
The patent implements dynamic beam management where the system transitions between wide and narrow beams based on terminal movement and channel conditions. This dynamic adaptation optimizes signal quality while managing complexity through automated beam selection and switching mechanisms.
Solution Approach 2:
The patent employs nested beam structures where narrow beams are formed within the coverage area of wide beams. This nesting allows the system to maintain a hierarchical beam management structure, improving signal quality for specific terminals while preserving overall coverage and reducing the need for completely separate beam management systems.
3Quantity of substance
If beam coverage area is increased to serve more terminals, then user capacity is improved, but spectral efficiency and frequency reuse deteriorate
Solution Approach 1:
The patent applies local quality by assigning different beam widths and coverage areas to different geographic regions based on terminal density and channel conditions. In high-density areas, narrow beams improve spectral efficiency, while in low-density areas, wide beams maintain user capacity, thus resolving the contradiction between user capacity and spectral efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances signal quality and capacity by forming narrow communication beams within wide beams, optimizing beam coverage areas, and maintaining signal focus on moving terminals, thereby improving spectral efficiency and user capacity in satellite systems.
Implementation Method 1
beamforming and multiple-input multiple-output (MIMO) techniques for communications between devices
Data Source
AI summary
Methods, systems, and devices communications are described. A terminal may be identified with a geographic region. First beam coefficients may be determined for an antenna array having interelement spacing of antennas that is different across the antenna array. The first beam coefficients may be used to form a first beam for the terminal, where a coverage area of the first beam may encompass the geographic region. The first beam may be used to communicate with the terminal. Based on a utilization of the first beam exceeding a threshold, second beam coefficients may be determined for the antenna array. The second beam coefficients may be used to form a second beam, where a coverage area of the second beam may be different than the coverage area of the first beam. The second beam may be used to communicate with the terminal.