Reconfigurable Frequency Filters for Coverage Enhancing Devices
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Solution Overview
Problem
The increasing number of communication nodes and the use of coverage enhancing devices (CEDs) lead to high intermodulation distortion (IMD) in wireless communication systems, degrading communication performance due to signal interference between different communication nodes.
Innovation Solution
Implementing reconfigurable frequency filters in CEDs that can be controlled to selectively filter incident signals, reducing interference by applying frequency filters that suppress out-of-band transmissions and optimize channel quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of communication nodes and CEDs is increased to expand coverage area, then coverage area is improved, but intermodulation distortion increases
Solution Approach 1:
The patent introduces frequency filters as intermediary components within the CEDs to mediate between the increased coverage area benefit and the harmful intermodulation distortion. These filters selectively attenuate unwanted frequency components generated by the interaction of multiple CEDs, thereby enabling expanded coverage without proportionally increasing interference.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the frequency filter characteristics (such as cutoff frequencies and filter coefficients) based on the operational environment and interference conditions. This allows the system to adapt the filter parameters in real-time to optimize the balance between coverage and interference suppression.
2Object-generated harmful factors
If frequency filters are added to CEDs to reduce interference, then intermodulation distortion is reduced, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by designing the frequency filters to serve multiple purposes: suppressing intermodulation distortion, shaping the frequency response for optimal signal transmission, and enabling dynamic adaptation to different communication scenarios. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The patent employs dynamic frequency filter configurations that can be adjusted based on real-time conditions. Rather than using fixed complex filter structures, the system dynamically adapts filter parameters (such as cutoff frequencies and attenuation characteristics) to match the current operational requirements, thereby reducing overall device complexity while maintaining effectiveness.
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 solution effectively reduces intermodulation distortion, improving communication performance by selectively filtering out interfering signals and enhancing channel quality between communication nodes.
Implementation Method 1
Implementing reconfigurable frequency filters in CEDs that can be controlled to selectively filter incident signals, reducing interference by applying frequency filters that suppress out-of-band transmissions
Implementation Method 2
An RRD can be implemented by an array of antennas that can reflect incident electromagnetic waves/signals. The array of antennas can be semi-passive. Semi-passive can correspond to a scenario in which the antennas can impose a variable phase shift
Data Source
AI summary
Examples provide a method of operating a first communication node (CN), wherein the method comprises obtaining a capability of a coverage enhancing device (CED) to provide reconfigurable frequency filters for incident signals received along one or more input spatial directions on a radio channel and transmitted into one or more output spatial directions. determining a frequency filter to be applied by the CED; and providing, to the CED, a message indicative of the frequency filter to be applied by the CED. Further examples, provide a method of operating a CED and a second CN. Still further examples provide a first CN, a CED and a second CN configured for performing the methods.