Full-Duplex Radio Gain Control Against Self-Interference ADC Saturation
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Solution Overview
Problem
The self-interference signal in full duplex radio (FDR) systems causes reduction in digital reception signals when the received signal strength indicator (RSSI) is greater than the reception power, leading to inefficient ADC processing.
Innovation Solution
A method for controlling gain in FDR systems by comparing the power of reference signals received in half-duplex and full-duplex modes, adjusting the full-duplex gain based on this comparison, and using a gain adaptive algorithm to optimize reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gain is controlled using RSSI in FDR system, then automatic gain control is simplified, but ADC processing performance deteriorates when SI signal power exceeds Rx power
Solution Approach 1:
The patent changes the control parameter from RSSI (which includes SI signal) to HD-mode reference signal power (which excludes SI signal). By measuring the power of reference signals transmitted in half-duplex mode, the system obtains an accurate representation of the desired Rx signal power without contamination from self-interference, enabling reliable ADC processing even when SI power exceeds Rx power.
2Productivity
If FDR system operates with high Tx power, then communication capacity increases, but self-interference signal power increases causing Rx signal degradation
Solution Approach 1:
The patent implements a feedback mechanism where the measured power of HD-mode reference signals is used to determine the appropriate gain setting for FD-mode operation. This feedback loop allows the system to adaptively adjust the gain based on actual Rx signal conditions, preventing saturation and maintaining reception quality even when operating with high transmission power.
3Ease of operation
If ADC processing is performed based on SI signal when SI power > Rx power, then gain control follows RSSI, but digital Rx signals are reduced and processing efficiency decreases
Solution Approach 1:
The patent extracts the desired Rx signal power information from the HD-mode reference signal transmission, separating it from the contaminated RSSI measurement that includes SI signal. By taking out only the relevant Rx signal component for gain control purposes, the system avoids the negative effects of SI contamination while maintaining automated gain control functionality.
Data Source
AI summary
The present document relates to a method for transmitting and receiving a signal by a user equipment in a wireless communication system, and discloses the method for transmitting and receiving a signal, comprising the steps of: receiving a first reference signal from a base station; receiving a second reference signal from the base station; measuring power of each of the received first reference signal and the received second reference signal; and comparing the sizes of the measured power of the first reference signal and the measured power of the second reference signal, wherein the first reference signal is received in a half-duplex (HD) transmission mode, the second reference signal is received in a full-duplex (FD) transmission mode, and an FD gain value of the FD transmission mode is changed on the basis of a result of the comparing.