RF Repeater Adaptive Interference Cancellation and SDR Switching
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Solution Overview
Problem
Existing RF repeaters without interference cancellation functions suffer from signal oscillation and reduced output strength in complex frequency environments, while interference cancellation systems face resource limitations and inefficiencies in wide-band frequency environments with coexisting preferred and non-preferred signals.
Innovation Solution
An RF repeater that selectively uses either an interference cancellation device for simple frequency environments or a software-defined radio (SDR) device for complex environments, featuring an RF down-converter, digitizer, and up-converter with ADC, DAC, and a controller for adaptive frequency processing and channel management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an interference cancellation function is added to the repeater, then oscillation problems are solved, but digital signal processing resources are restricted and sampling limits occur
Solution Approach 1:
The patent implements dynamic switching between interference cancellation mode and SDR mode based on the complexity of the frequency environment. The system adapts its processing capabilities in real-time, using interference cancellation when oscillation is detected and SDR processing when dealing with complex multi-frequency environments, thereby optimizing resource utilization and avoiding processing bottlenecks
Solution Approach 2:
The system changes operational parameters by switching between different processing modes (interference cancellation vs. SDR) depending on environmental conditions. This parameter change allows the repeater to adjust its digital signal processing resources dynamically, matching the complexity of the task at hand and preventing resource exhaustion
2Reliability
If existing interference cancellation repeaters are used, then feedback signal cancellation is achieved, but they cannot operate properly in wide-band frequency environments with coexisting preferred and non-preferred signals
Solution Approach 1:
The patent creates a universal repeater system that can perform multiple functions: interference cancellation for simple feedback scenarios and SDR processing for complex wide-band environments. This multi-functionality allows the system to adapt to various frequency environments and signal conditions, solving both oscillation problems and complex frequency coexistence issues
Solution Approach 2:
The system dynamically switches between interference cancellation mode and SDR mode based on the detected frequency environment complexity. In simple environments, interference cancellation provides effective feedback suppression, while in complex wide-band environments, SDR processing handles multiple frequency signals, thereby achieving universal adaptability across different deployment scenarios
3Reliability
If repeater output strength is decreased to avoid oscillation, then oscillation is prevented, but shadow areas are created and service radius is reduced
Solution Approach 1:
The patent converts the harmful feedback signal into a beneficial cancellation target. By actively detecting and canceling feedback signals through interference cancellation and SDR processing, the system can maintain high output power without causing oscillation. This transforms the previously harmful feedback into a manageable parameter that enables both strong signal output and oscillation-free operation
Solution Approach 2:
The system implements active feedback cancellation mechanisms that detect feedback signals and generate counter-signals to neutralize them. This feedback control allows the repeater to operate at high output power levels while preventing oscillation, thereby maintaining large service radius without creating shadow areas
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
Improves communication service quality and secures a wider service radius by adapting to specific frequency environments, effectively canceling feedback signals and filtering unnecessary frequency components.
Implementation Method 1
an RF down-converter configured to receive an analog signal and perform frequency down-conversion
Implementation Method 2
an analog-to-digital converter (ADC) configured to convert an analog signal into a digital signal
Implementation Method 3
an interference cancellation digital processor configured to determine whether a feedback signal is present by analyzing a correlation between the digital signal and a temporary previously transmitted signal, and to cancel the feedback signal when the feedback signal is present
Implementation Method 4
a digital-to-analog converter (DAC) configured to convert a signal output from the interference cancellation digital processor into an analog signal to be transmitted
Implementation Method 5
an RF up-converter configured to perform frequency up-conversion to generate a signal with a frequency equal to that of the received analog signal
Implementation Method 6
an SDR digital processor configured to block a frequency signal component of an unnecessary channel in the digital signal and to allow a frequency signal component of a necessary channel in the digital signal to pass through digital filtering
Data Source
AI summary
In a mobile communication service system, repeaters can be installed to cover shadow areas where it may otherwise be difficult to transmit and/or receive mobile signals. A radio frequency (RF) repeater that may select between an interference cancellation device and a software-defined radio (SDR) device is provided. The RF repeater can select use of the interference cancellation device in environments or situations that are relatively less complex, and can switch to use of the SDR device instead for environments or situations where more complex frequency processing may be needed and where such frequency processing may be prioritized over interference cancellation to provide better or more effective signal transmissions.