RF Circuit Band Elimination Filtering for TDD Sub-Band Interference
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Solution Overview
Problem
In 5GNR communication systems, the use of wide communication bands leads to signal interference between adjacent sub-bands, degrading the quality of signals in TDD communication.
Innovation Solution
A radio-frequency circuit incorporating a filter with a pass band for a first sub-band and a band elimination filter to attenuate interfering second sub-bands, reducing signal interference and maintaining signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a wide communication band is divided into multiple sub-bands for TDD communication, then the communication capacity is improved, but signal interference between adjacent sub-bands occurs degrading signal quality
Solution Approach 1:
A band elimination filter is introduced as an intermediary component between the antenna and the first filter. This filter specifically eliminates the frequency band of the second sub-band, preventing its signal from interfering with the first sub-band signal processing. The band elimination filter acts as a mediator that selectively removes harmful frequency components while allowing the desired sub-band signals to pass through to the subsequent filtering stages.
2Productivity
If multiple non-contiguous component carriers are used simultaneously, then the efficient use of wide communication band is improved, but receive sensitivity is lowered due to interference
Solution Approach 1:
The harmful second sub-band signal is extracted and removed from the composite signal received by the antenna. The band elimination filter specifically targets and extracts the frequency components corresponding to the second sub-band, separating them from the first sub-band signal before the first filter processes the desired signal. This extraction approach prevents the interfering signal from affecting receive sensitivity while maintaining the ability to utilize multiple non-contiguous component carriers.
3Adaptability or versatility
If adjacent sub-bands are used for different operators, then the utilization of wide communication band is improved, but signal quality is degraded due to mutual interference
Solution Approach 1:
The band elimination filter serves as a mediator that enables flexible band allocation to different operators while maintaining signal quality. By selectively eliminating the frequency band assigned to one operator (second sub-band) before processing the signal for another operator (first sub-band), the system can accommodate multiple operators in adjacent frequency bands without mutual interference degrading signal quality.
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 signal degradation and improves receive sensitivity in TDD communication by minimizing interference between non-contiguous sub-bands, enabling efficient intra-band carrier aggregation.
Implementation Method 1
a band elimination filter which has a first elimination band corresponding to a second sub-band included in the first band
Data Source
AI summary
A radio-frequency circuit includes a filter and a band elimination filter. The filter has a pass band corresponding to a first sub-band. At least part of the first sub-band is included in a first band used for TDD communication. The band elimination filter is connected to the filter and has a first elimination band which corresponds to a second sub-band included in the first band. The second sub-band is located between a third sub-band and a fourth sub-band. The third and fourth sub-bands are included in the first band. The first sub-band includes the second, third, and fourth sub-bands.