Interference Cancellation Repeater Gain Control for Stable Pre-Distortion
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Solution Overview
Problem
Implementing a stable pre-distortion function in interference cancellation relay devices is challenging due to signal fluctuations, which affect the quality of communication services.
Innovation Solution
Incorporating a gain control unit that measures and controls the intensity of a reference signal to maintain a consistent output signal for the pre-distortion unit, minimizing interference and oscillation, and improving the non-linear characteristic of the power amplifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pre-distortion function is implemented in an interference cancellation relay device, then the non-linear characteristic of the power amplifier is improved, but the function becomes unstable due to signal fluctuations
Solution Approach 1:
A gain control unit is introduced as an intermediary between the interference cancellation unit and the pre-distortion unit. This mediator measures the intensity of the reference signal and adjusts the gain of the output signal accordingly, preventing signal fluctuations from reaching the pre-distortion unit and causing instability.
Solution Approach 2:
The gain control unit implements a feedback mechanism by continuously measuring the reference signal intensity and adjusting the output signal gain in real-time. This feedback loop ensures that the pre-distortion unit receives a stable signal with consistent intensity, maintaining function stability despite variations in input signals.
2Reliability
If the output signal intensity varies significantly, then the pre-distortion function cannot be stably implemented, but maintaining constant intensity requires additional control mechanisms
Solution Approach 1:
The gain control unit performs multiple functions: it measures reference signal intensity, calculates appropriate gain values, and adjusts the output signal gain. By consolidating these control functions into a single unit, the patent avoids the need for separate complex control mechanisms while maintaining pre-distortion stability.
3Device complexity
If interference cancellation is performed without gain control, then signal processing is simpler, but signal fluctuations cause oscillation and reduce communication quality
Solution Approach 1:
The gain control unit dynamically changes the gain parameter of the output signal based on the measured reference signal intensity. This parameter adjustment prevents signal fluctuations from causing oscillation while maintaining relatively simple signal processing architecture, thereby ensuring communication service quality.
Data Source
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AI summary
Provided is an interference cancellation relay device. The interference cancellation relay device includes: an interference cancellation unit cancelling an interference signal from an input signal and outputting the input signal from which the interference signal is removed; a gain control unit controlling a gain of an output signal of the interference cancellation unit; and a pre-distortion unit distorting the output signal of the interference cancellation unit, of which the gain is controlled by the gain control unit.