Phased Array Antenna Null Steering for Interference Suppression
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Solution Overview
Problem
Point-to-point radio systems face limitations in capacity due to interference from external sources, which reduces effective data transmission rates and limits frequency reuse, especially in densely populated areas where systems may need to downgrade from 4096-QAM to 256-QAM.
Innovation Solution
Implementing a phased array antenna system with steerable peaks and nulls to optimize RF energy coupling and suppress interference by directing nulls towards interferers, while using a diplexer in conjunction with phased array antennas to separate transmit and receive signals, thereby reducing interference and enhancing system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional antennas are used in densely populated areas, then system coverage is maintained, but interference from external sources increases and capacity decreases
Solution Approach 1:
The patent applies local quality by creating spatially selective radiation patterns where different regions of the antenna beam serve different functions: main lobes provide coverage in desired directions while nulls provide interference rejection in specific directions. This allows the system to have different radiation characteristics in different spatial locations, optimizing both capacity and interference mitigation locally.
Solution Approach 2:
The patent implements dynamics through electronically steerable beamforming that can dynamically adjust the radiation pattern in real-time. The system can steer main lobes and nulls to different angular positions based on the location of interferers and desired users, allowing adaptive optimization of the radiation pattern to changing environmental conditions and interference scenarios.
2Productivity
If frequency reuse is increased to enhance capacity, then system capacity improves, but interference from adjacent channels increases
Solution Approach 1:
The patent transitions from frequency-domain resource allocation to spatial-domain resource allocation by using phased array beamforming. Instead of assigning different frequencies to different users, the system assigns different spatial directions, allowing the same frequency to be reused in different spatial locations without causing interference, thereby increasing system capacity through spatial multiplexing.
3Object-affected harmful factors
If directional beamforming is used to reduce interference, then interference rejection improves, but system complexity increases
Solution Approach 1:
The patent applies partial action by forming only the essential radiation pattern features needed for interference mitigation - specifically main lobes for coverage and nulls for interference rejection - rather than optimizing all possible beam parameters. This selective approach achieves sufficient interference rejection while keeping the beamforming complexity manageable.
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
The phased array antenna system effectively reduces interference, increases data transmission rates, and allows for more efficient frequency reuse, improving the overall capacity and reliability of point-to-point radio systems.
Implementation Method 1
Each element of the plurality of antenna elements is fed with a respective feed signal having a respective phase and magnitude so that the plurality of antenna elements collectively transmit and receive the RF energy in a desired direction
Implementation Method 2
The plurality of antenna elements collectively transmit and receive the RF energy in a desired direction through controlled phase and magnitude of feed signals
Implementation Method 3
Each element of the plurality of antenna elements is fed with a respective feed signal having a respective phase and magnitude so that the plurality of antenna elements collectively transmit and receive the RF energy
Data Source
AI summary
A point-to-point radio system includes a phased array antenna system and circuitry to couple the phased array to a diplexer for steering nulls of the phased array to suppress interference.