Signal Processing for Direction-Specific PIM Suppression
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Solution Overview
Problem
Passive intermodulation (PIM) interference signals generated by passive devices in a signal transmit channel enter the receive channel, increasing noise and reducing the quality of wireless communication systems, necessitating uniform signal processing that can inaccurately estimate downlink and uplink channel states.
Innovation Solution
Implementing different processing manners for downlink and uplink signals to suppress PIM interference, where downlink signals are processed without PIM suppression to maintain accurate channel state estimation, while uplink signals undergo PIM suppression, thereby improving signal processing flexibility and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform processing is applied to all signals, then processing simplicity is maintained, but channel state estimation accuracy deteriorates
Solution Approach 1:
The patent applies different processing methods to different signals based on their specific characteristics. Uplink signals receive PIM suppression processing while downlink signals receive different processing, allowing each signal type to be handled according to its local requirements for optimal channel state estimation accuracy.
2Object-affected harmful factors
If PIM suppression processing is applied to all signals, then PIM interference is reduced, but downlink channel state estimation accuracy deteriorates
Solution Approach 1:
The patent selectively applies PIM suppression processing only to uplink signals where PIM interference is present, while applying different processing to downlink signals. This localized approach eliminates PIM interference in the uplink channel without degrading downlink channel state estimation accuracy.
3Adaptability or versatility
If different processing methods are applied to different signals, then signal processing flexibility is improved, but processing complexity increases
Solution Approach 1:
The patent segments the signal processing path into distinct processing flows for uplink and downlink signals. By dividing the processing tasks according to signal direction and characteristics, the system achieves flexible adaptive processing while maintaining manageable complexity through structured separation of processing functions.
Data Source
AI summary
A method may be performed by a first apparatus. The method may include: receiving first information, where the first information indicates to perform first processing on a first signal transmitted on a first resource unit, and the first signal is used to estimate a downlink channel state; and performing the first processing on the first signal, and performing second processing on a second signal transmitted on a second resource unit, where the second signal is used to estimate an uplink channel state, the second processing includes processing for suppressing a passive intermodulation interference signal in the second signal, and the first processing and the second processing are different processing manners. In this way, the first apparatus can use different processing manners for the first signal used for the downlink channel state and the second signal used for the uplink channel state, so that signal processing flexibility can be improved.