Adaptive Front-End Module for PIM Interference Mitigation
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Solution Overview
Problem
Passive intermodulation (PIM) interference significantly degrades the performance of LTE networks due to its susceptibility to interference, leading to lower throughput, dropped calls, and traffic congestion, especially in environments with multiple transmitters and shared base-stations.
Innovation Solution
A system and method for detecting and mitigating PIM interference using an adaptive front-end module with tunable filters and signal processing algorithms that filter out interference from CDMA carriers, employing adaptive thresholds and spectral analysis to isolate and suppress interference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If SC-FDMA is used for LTE uplink to reduce power consumption, then mobile device power consumption is reduced, but the system becomes more susceptible to interference
Solution Approach 1:
The patent introduces an adaptive front-end module as an intermediary component between the antenna and the receiver. This module includes tunable filters and interference mitigation algorithms that actively identify and remove PIM interference from the received signal before it reaches the main receiver, thereby protecting the SC-FDMA uplink from interference while maintaining the low power consumption benefits
Solution Approach 2:
The system implements feedback mechanisms where the adaptive front-end module continuously monitors the received signal for interference characteristics, adjusts filter parameters in real-time, and feeds back interference mitigation decisions to improve signal quality. This closed-loop approach enables dynamic adaptation to changing interference conditions
2Productivity
If multiple transmitters are co-located on shared base-stations to increase network capacity, then network throughput is improved, but PIM interference increases
Solution Approach 1:
The patent segments the signal processing function by separating interference mitigation from the main receiver chain. The adaptive front-end module processes signals independently for each transmitter/receiver pair, applying specific filtering and interference cancellation techniques tailored to each combination, thereby managing PIM interference in multi-transmitter environments
Solution Approach 2:
The system dynamically changes filtering parameters, threshold levels, and interference cancellation coefficients based on real-time signal conditions. The adaptive front-end module adjusts these parameters to optimize performance for different transmitter combinations and interference scenarios, enabling high network capacity while suppressing PIM interference
3Reliability
If adaptive filtering and spectral analysis are applied to detect and remove interference, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent employs dynamic adaptive filtering where filter coefficients are continuously adjusted based on real-time spectral analysis of the received signal. The system transitions from static to dynamic processing, adapting filter bandwidth, center frequency, and depth parameters to match the actual interference characteristics, thereby improving signal quality while managing complexity through intelligent adaptation
Solution Approach 2:
The adaptive front-end module performs self-adjustment by automatically detecting interference patterns through spectral analysis and configuring its own filtering parameters without external intervention. The system monitors its own performance and autonomously optimizes interference mitigation parameters, reducing the need for complex external control mechanisms
Data Source
AI summary
A system that incorporates aspects of the subject disclosure may perform operations including, for example, receiving, via an antenna, a signal generated by a communication device, detecting passive intermodulation interference in the signal, the interference generated by one or more transmitters unassociated with the communication device, and the interference determined from signal characteristics associated with a signaling protocol used by the one or more transmitters. Other embodiments are disclosed.