Phased Array Beam Patterns for Interference Control and Spatial Priority
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in managing radiated power levels and spatial priority, leading to interference and underutilization of spatial resources, particularly in spectrum access systems where different wireless devices have varying priority levels, and existing beamforming solutions require significant computational burden and lack priority awareness.
Innovation Solution
A systematic beamforming method that adjusts power levels and beam shapes to limit unwanted radiation while maintaining signal quality in desired directions, using algorithms to modify precoders and create interference-aware side-lobes, allowing for opportunistic transmission and enhanced channel diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power back-off is used to manage interference and signal strength levels, then interference is reduced, but spatial resource utilization is under-utilized and link adaptation becomes more complicated
Solution Approach 1:
The patent applies local quality by differentiating power levels across different spatial directions. Instead of uniformly reducing power in all directions (power back-off), the system transmits at higher power levels in desired directions while maintaining lower power levels in unwanted directions. This spatially selective power control is achieved through beamforming techniques that shape the radiation pattern to concentrate energy toward target receivers and suppress energy in other directions, thereby reducing interference locally without sacrificing overall spatial resource utilization.
2Object-affected harmful factors
If complete transmitter shutdown or switching to another band is performed to avoid interference, then interference is eliminated, but resource utilization becomes highly inefficient
Solution Approach 1:
The patent segments the transmission space into desired directions and unwanted directions. Rather than shutting down the entire transmitter or switching bands, the system divides the radiation pattern into spatial sectors using beamforming. Transmission is maintained in desired directional sectors while suppressing radiation in unwanted sectors, thereby eliminating interference in specific directions without affecting overall resource utilization. This spatial segmentation allows simultaneous coexistence of multiple transmissions with different spatial priorities.
3Manufacturing precision
If numerical optimization is used to solve power level constraints in multiple directions, then power distribution is optimized, but computational burden increases significantly
Solution Approach 1:
The patent changes the approach from solving complex numerical optimization problems with multiple constraints to using closed-form beamforming solutions with predefined radiation patterns. Instead of iteratively optimizing power levels subject to multiple directional constraints, the system employs analytical beamforming techniques that directly compute the required weight vectors for antenna elements. This parameter transformation from optimization variables to closed-form solutions significantly reduces computational burden while maintaining precise power distribution control across different directions.
4Ease of operation
If a single beamformer is used for power back-off, then implementation is simple, but spatial diversity feature is highly under-utilized
Solution Approach 1:
The patent introduces dynamic beamforming capabilities that adapt transmission patterns based on spatial priority requirements. Instead of using a fixed single beamformer for all transmissions, the system dynamically adjusts beamforming weights and radiation patterns according to the spatial distribution of receivers and their priority levels. This dynamic adaptation enables the system to exploit spatial diversity by directing different beam patterns toward different receivers simultaneously, thereby utilizing the full potential of the antenna array while maintaining implementation feasibility through standardized beamforming algorithms.
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
This approach enhances spatial resource utilization by creating controlled sidelobes, improving channel diversity and maintaining signal quality, while avoiding band switching and reducing computational complexity, thus optimizing transmission in multi-layer and multi-user MIMO networks.
Implementation Method 1
All of these systems, as well as others, may utilize phased array beam forming antennas to transmit and receive radio frequency (RF) signals over the air
Implementation Method 2
Multiple input multiple output (MIMO) antenna systems include an array of antenna elements, and employ beamforming and spatial multiplexing techniques to control the spatial distribution of the signals radiated by the array
Implementation Method 3
Multiple input multiple output (MIMO) antenna systems include an array of antenna elements, and employ beamforming and spatial multiplexing techniques to control the spatial distribution of the signals radiated by the array
Data Source
AI summary
A method and network node for management of beams radiated by a phased array antenna of a network node to comply with regulatory or other constraints are provided. According to one aspect a network node is configured to selectively transmit radio frequency beams in a plurality of directions on a plurality of layers to a plurality of wireless devices. The network node includes processing circuitry configured to direct and beams to a first set of directions while suppressing energy radiated in a second set of directions according to algorithms that modify a precoder to achieve a distribution of radiated energy without computationally burdensome optimization algorithms.