Dynamic Antenna Beam Control for Interference Reduction
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Solution Overview
Problem
Current wireless communication systems, such as CDMA and GSM, face interference issues due to undesired signals from nearby sources, which are often mitigated by tilting antennas, but this approach reduces desired signal sensitivity and coverage, especially when interfering signals are present at the overlap of adjacent antenna elements.
Innovation Solution
The method involves adjusting the overlap area of antenna beam patterns by rotating or altering the bearing of multiple antenna elements to position the interfering signal at a sensitivity dip, reducing interference while minimizing impact on desired signal reception, and can be combined with tilting or signal delay techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the antenna is tilted upward to reduce nearby sensitivity to interfering signal sources, then interference from close sources is reduced, but sensitivity for reception of signals from mobile stations is also decreased
Solution Approach 1:
The patent applies local quality by creating a directional sensitivity pattern where different spatial regions have different sensitivity characteristics. The antenna system is configured to have high sensitivity in the direction of desired mobile stations while maintaining low sensitivity (sensitivity dip) in the direction of interfering signal sources. This is achieved through coordinated beamforming of multiple antenna elements, producing a radiation pattern with localized sensitivity variations rather than uniform tilting, thereby reducing interference without compromising overall reception sensitivity.
2Object-affected harmful factors
If the antenna is tilted downward to reduce interference from distant sources, then interference from outer coverage area is reduced, but coverage area and signal strength are affected
Solution Approach 1:
The patent creates localized sensitivity dips in specific directions while maintaining high sensitivity in other directions. By configuring the beamforming weights of multiple antenna elements, the system produces a radiation pattern with directional nulls (low sensitivity regions) pointing toward interfering sources, while the main lobes (high sensitivity regions) maintain coverage of the intended service area. This allows interference reduction without compromising overall coverage area.
3Object-affected harmful factors
If antenna elements are tilted to suppress interference, then interference reduction is achieved, but deviation of desired coverage area occurs and reception of mobile stations is affected
Solution Approach 1:
The patent implements dynamic beamforming where the sensitivity pattern of the antenna system can be electronically adjusted without physical movement. By dynamically changing the phase and amplitude weights of multiple antenna elements, the system can create and reposition sensitivity dips to track moving interfering sources while maintaining stable coverage areas for mobile stations. This dynamic control allows adaptive interference suppression without fixed geometric deviations.
4Object-affected harmful factors
If both antenna elements are tilted to handle interfering signal at overlap area, then interference at overlapping region is reduced, but complexity and impact on desired coverage increases
Solution Approach 1:
The patent combines the beamforming control of multiple antenna elements into a unified control system. Instead of independently tilting each antenna element, the system jointly processes signals from all elements and applies coordinated phase and amplitude adjustments. This merging of control functions allows the system to create the desired sensitivity dip pattern through cooperative beamforming, reducing the need for complex independent mechanical tilting mechanisms while effectively suppressing interference in overlapping coverage areas.
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 reduces interference to a limited area, preserving desired signal strength and coverage, and can be applied to various wireless communication systems, including CDMA, GSM, and unlicensed bands, by dynamically adjusting antenna positions and phases to minimize interference.
Implementation Method 1
the superimposing effect of radio waves of the two antenna elements causes a reduction of interference when the interfering signal source is physically positioned at a dip of the sensitivity pattern for a desired frequency
Data Source
AI summary
Undesired interfering signal sources within a wireless communication network disturb the radio communication between radio base stations and mobile stations. The invention presents a method and device wherein the beam pattern of an antenna, comprising two or more sectorised antenna elements with overlapping beam patterns, is adapted such that the position of the source of interfering signal is preferably substantially located within the overlap of said beam patterns. The one or more beam patterns are adapted in bearing such that the resulting interfering signal is reduced by the superimposing effect of radio wave propagation within the overlap area.