Remote Radio Head Amplifier Switching for RF Interference Mitigation
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Solution Overview
Problem
Radio-frequency (RF) interference at remote radio heads (RRH) of base stations due to non-linearity in power amplifier components leads to desensitization and increased inter-modulation products, causing bandwidth occupation and resource consumption issues.
Innovation Solution
Implementing a system that dynamically adjusts power amplifiers at the RRH based on RF-interference indicators, switching between active and saturation modes to optimize gain and linearity, and using a combination of non-linear and linear power amplifiers to minimize RF interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power amplifier operates in active mode to optimize gain and efficiency, then gain and efficiency are improved, but RF interference increases due to non-linearity
Solution Approach 1:
The patent implements dynamic mode switching between active and saturation modes based on real-time RF interference conditions. The system transitions from a static operating mode to a dynamic one that adapts to changing channel conditions, allowing the power amplifier to operate in active mode when RF interference is low (optimizing gain) and switch to saturation mode when RF interference is high (reducing non-linearity).
Solution Approach 2:
The patent changes the operating parameters of the power amplifier by switching between two distinct operational states: active mode (for optimized gain and efficiency) and saturation mode (for reduced non-linearity and RF interference). This parameter change is triggered by RF interference indicators received from user devices, allowing the system to adapt to varying channel conditions.
2Object-generated harmful factors
If the power amplifier operates in saturation mode to reduce non-linearity and RF interference, then RF interference is reduced, but gain and efficiency decrease
Solution Approach 1:
The system dynamically selects the appropriate operating mode based on real-time RF interference measurements. Rather than operating continuously in saturation mode, the system transitions to active mode when conditions permit, thereby recovering gain and efficiency while maintaining RF interference reduction when necessary.
Solution Approach 2:
The patent employs periodic monitoring of RF interference indicators and periodic switching between operating modes. This periodic action allows the system to alternate between saturation mode (for RF interference reduction) and active mode (for gain optimization) based on changing channel conditions, rather than maintaining a fixed operating state.
3Stability of the object's composition
If a linear power amplifier is used to reduce inter-modulation products, then linearity is improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the power amplifier functionality into two distinct stages: a non-linear power amplifier for bulk signal amplification and a linear power amplifier for final signal conditioning. This segmentation allows each amplifier to be optimized for its specific function, with the non-linear amplifier handling the majority of gain requirements and the linear amplifier providing the necessary linearity for the final output stage.
Solution Approach 2:
The patent applies local quality by making different parts of the amplification chain have different characteristics. The first power amplifier is designed with non-linear characteristics optimized for high gain, while the second power amplifier is designed with linear characteristics optimized for linearity. Each stage has locally optimized properties suited to its specific function in the overall signal chain.
Data Source
AI summary
A method, system, and medium are provided for mitigating radio-frequency (RF) interference at a remote radio head (RRH) of a base station due to non-linearity in at least one of the RRH components. RF-interference indicators received from one or more user devices are monitored. When the RF-interference indicators indicate that RF interference at the RRH is above a predefined threshold, then a power amplifier associated with the RRH is adjusted to operate in a saturation mode thereby reducing the generation of inter-modulation products and reducing RF interference at the RRH. When the RF-interference indicators indicate that RF interference at the RRH is below the predefined threshold, then the power amplifier is adjusted to operate in an active mode thereby optimizing signal gain.