Interference Suppression Matrix for Network Nodes
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Solution Overview
Problem
Existing solutions struggle to efficiently mitigate interference in network nodes, particularly when the downlink signal is unknown, as they often require knowledge of the interfering signal and are complex to compute, especially in scenarios with multiple bands and non-linear components.
Innovation Solution
A method and control device that estimate interference characteristics by calculating correlation statistics of power levels across frequency sub-bands, determining an interference suppression matrix based on inter-band interference, and applying it to mitigate interference in network nodes without requiring synchronization with the desired uplink signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing PIM suppression solutions are used, then interference cancellation performance is improved, but computation complexity increases significantly
Solution Approach 1:
The patent divides the frequency spectrum into multiple sub-bands and processes interference suppression independently in each sub-band. This segmentation allows the complex interference cancellation to be broken down into manageable operations, reducing overall computation complexity while maintaining effectiveness against multi-band PIM interference.
Solution Approach 2:
The patent performs preliminary estimation of interference characteristics by calculating correlation statistics of power levels across frequency sub-bands before applying the full interference suppression matrix. This preliminary action characterizes the interference pattern in advance, enabling more efficient suppression operations without requiring exhaustive computation for each interference component.
2Ease of operation
If full knowledge of PIM signals is assumed, then interference cancellation is simplified, but adaptability to unknown interference decreases
Solution Approach 1:
The patent enables the system to characterize and suppress interference using only the received signals themselves, without requiring external knowledge of the interfering PIM signals. By calculating correlation statistics from the received signal spectrum, the system self-characterizes the interference pattern and adapts the suppression strategy accordingly, making it universally applicable to unknown interference scenarios.
Solution Approach 2:
The patent dynamically adjusts interference suppression parameters based on estimated interference characteristics. By calculating correlation statistics and determining interference suppression matrices adapted to the specific interference pattern observed in each sub-band, the system can effectively handle varying and unknown interference conditions without requiring predefined signal knowledge.
3Reliability
If interference suppression is applied across all frequency bands, then overall interference reduction is improved, but processing time increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands and applies interference suppression independently to each sub-band. This allows parallel processing of interference reduction across different frequency regions, maintaining comprehensive interference coverage while reducing the sequential processing time that would result from treating the entire spectrum as a single block.
Data Source
AI summary
There is provided mechanisms for mitigating interference in a network node. A method is performed by a control device (200). The method comprises receiving (S102) radio signals comprising at least one desired signal and interference, estimating (S104) a characteristic of the interference, wherein the estimation comprises calculating correlation statistics of power levels of frequency sub-bands comprising the interference with frequency sub-bands comprising the received radio signals. The method comprises determining (S106) an interference suppression matrix to suppress the interference in the frequency sub-bands of the received radio signals based on the estimated characteristic of the interference, wherein the interference suppression matrix is further determined based on information from inter-band interference observed across distinct sub-bands of the received radio signals. The method comprises applying (S108) the interference suppression matrix on the received radio signals to mitigate the interference from the received radio signals.