Interference Cancellation Relay Gain Control for Stable Pre-Distortion
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Solution Overview
Problem
Interference cancellation relay devices face challenges in implementing a pre-distortion function due to significant signal fluctuations caused by interference signals, which complicates the stabilization of communication service quality.
Innovation Solution
The implementation of an interference cancellation relay device with a gain control unit that constantly maintains the output signal gain of the interference cancellation unit, allowing a pre-distortion unit to operate stably and minimize interference and oscillation, thereby improving the non-linear characteristic of the power amplifier and communication service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If interference cancellation is applied to cancel feed-back signals, then the degree of isolation between receiving antenna and transmitting antenna is improved, but the received signal fluctuates significantly making pre-distortion function implementation difficult
Solution Approach 1:
The received signal is segmented into two separate components: a desired signal component and an interference signal component. The interference cancellation unit specifically targets and removes the interference component (feed-back signals) from the composite received signal, leaving the desired signal intact. This segmentation approach allows selective removal of harmful interference while preserving the stability and quality of the desired communication signal for subsequent pre-distortion processing.
Solution Approach 2:
An interference cancellation unit is introduced as an intermediary component between the receiving antenna and the pre-distortion function. This intermediary unit processes the received signal by detecting and removing interference components before the signal reaches the pre-distortion unit. By placing this intermediary processing stage, the system can eliminate interference signals that would otherwise cause significant fluctuations and prevent stable pre-distortion implementation.
2Reliability
If pre-distortion function is implemented to improve non-linear characteristic of power amplifier, then communication service quality is improved, but signal fluctuations from interference signals prevent stable implementation
Solution Approach 1:
The interference cancellation operation is performed as a preliminary action before the pre-distortion function is applied. By removing interference signals in advance, the input signal to the pre-distortion unit becomes stable and suitable for accurate pre-distortion processing. This preliminary interference removal enables the pre-distortion function to operate effectively on a clean signal, thereby improving communication service quality without being disrupted by signal fluctuations.
Solution Approach 2:
The system employs feedback mechanisms where the output of the interference cancellation unit is monitored and used to adjust the pre-distortion processing. The gain control unit receives feedback about the signal characteristics after interference cancellation and adjusts the pre-distortion parameters accordingly. This feedback loop ensures that the pre-distortion function can adapt to the processed signal conditions and maintain stable operation, thereby improving communication service quality.
3Stability of the object's composition
If gain control is constantly maintained on output signal of interference cancellation unit, then pre-distortion unit can operate stably, but device complexity increases
Solution Approach 1:
The gain control function is merged with the existing interference cancellation unit and pre-distortion unit into an integrated signal processing chain. Rather than adding a completely separate gain control system, the patent combines gain control capabilities within the existing architecture, where the gain control unit works in conjunction with the interference cancellation and pre-distortion units. This merging approach provides stable output signal gain while minimizing the increase in overall device complexity by utilizing shared components and coordinated operation.
Data Source
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.