Interference Source Positioning in TD-LTE Systems
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Solution Overview
Problem
The complexity of detecting interference sources in TD-LTE systems is high due to multiple bandwidth aliasing and misaligned subcarriers, leading to increased complexity and potential performance loss in identifying interfering cells.
Innovation Solution
The method involves frequency offset compensation and alignment of subcarriers using a system reference subcarrier, transforming pilot sequences into interference source detection sequences, and performing inverse Fourier transformations to reduce the complexity of detecting interfering cells by focusing on relevant aliasing bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the receiving end traverses all possible bandwidth combinations to detect interference sources, then the detection comprehensiveness is improved, but the detection complexity increases significantly
Solution Approach 1:
The patent segments the interference detection process by dividing the frequency spectrum into distinct bandwidth segments (e.g., 10MHz, 20MHz segments). Each segment is detected independently using corresponding pilot sequences, avoiding the need to traverse all possible bandwidth combinations simultaneously. This segmentation reduces detection complexity while maintaining comprehensive coverage.
Solution Approach 2:
The patent performs preliminary frequency domain compensation and subcarrier alignment before the actual interference detection process. By pre-aligning subcarriers and compensating frequency offsets, the system simplifies subsequent detection operations, reducing the computational burden of traversing multiple bandwidth scenarios.
2Measurement precision
If frequency compensation is performed to align subcarriers of different cells, then the detection accuracy is improved, but the computational complexity increases
Solution Approach 1:
The patent employs self-service mechanisms where each cell independently performs frequency offset compensation on its own subcarriers using a system reference subcarrier. This distributed approach allows frequency alignment to be handled locally at each cell rather than requiring complex centralized compensation, reducing overall system complexity while maintaining accuracy.
3Measurement precision
If all bandwidth aliasing scenarios are traversed and detected, then the interference source identification accuracy is improved, but the calculation time increases
Solution Approach 1:
The patent segments the bandwidth detection into discrete, non-overlapping bandwidth segments (10MHz, 20MHz, 40MHz, 80MHz). Each segment has its own pilot sequence and detection process, allowing parallel or sequential detection without requiring exhaustive traversal of all aliasing scenarios. This segmentation significantly reduces detection time while maintaining identification accuracy.
Solution Approach 2:
The patent implements periodic detection where interference sources are detected at regular intervals using predetermined pilot sequences for different bandwidth segments. This periodic approach allows the system to efficiently scan through different bandwidth scenarios without continuous exhaustive search, reducing overall detection time while maintaining accuracy through systematic sampling.
Data Source
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AI summary
Provided are a method and apparatus for positioning an interference source, relating to a field of wireless communications. The method includes: performing, by each cell, a frequency offset compensation on a subcarrier transmitted and received by the cell and used for carrying an interference source detection sequence according to a system reference subcarrier; performing, by each cell, a correlative processing on the interference source detection sequence carried by the subcarrier received by the cell by using a local interference source detection sequence which is generated locally; and in response to determining that a result of the correlative processing performed by each cell is correlative, determining, by each cell, a cell transmitting the interference source detection sequence as the interference source. Through embodiments of the present disclosure, when a system has aliasing of multiple different bandwidths, it does not require to traverse and detect various aliasing scenarios but only requires to detect correlative possible sequences in the aliasing bandwidths to position the interfering cell, thereby reducing positioning complexity and increasing calculation speed.