Full Duplex Radio Self-Interference Cancellation Using Reference Signals
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Solution Overview
Problem
Wireless access systems face challenges in efficiently transmitting and receiving signals in Full Duplex Radio (FDR) transmission environments due to self-interference, which affects signal quality and requires effective interference cancellation methods.
Innovation Solution
A method involving a terminal that receives a first reference signal from a base station, calculates channel information for self-interference, and simultaneously receives a second reference signal from another terminal to cancel interference, allowing efficient signal reception using processor-configured RF units and specific reference signal assignments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FDR transmission is implemented to enable simultaneous uplink and downlink communication, then spectral efficiency and system capacity are improved, but self-interference between transmitted and received signals deteriorates signal quality
Solution Approach 1:
The patent extracts and separately processes the self-interference component from the received signal. By using reference signals to estimate the self-interference channel and explicitly canceling the self-interference component before regular signal processing, the harmful self-interference is separated and removed, allowing FDR transmission to proceed with improved signal quality
Solution Approach 2:
The patent applies preliminary anti-action by estimating the self-interference channel using reference signals before the actual data reception. The self-interference component is predicted and canceled in advance, creating a cleaner received signal that enables simultaneous uplink and downlink communication without severe interference degradation
2Measurement precision
If reference signals are transmitted for channel estimation, then channel information accuracy is improved, but signal transmission overhead increases
Solution Approach 1:
The patent makes the reference signal serve multiple functions: it is used both for conventional channel estimation and for self-interference channel estimation. By designing the reference signal structure and processing to extract both types of channel information from the same reference signal transmission, the overhead is reduced while maintaining accurate channel knowledge for both purposes
Solution Approach 2:
The patent merges the self-interference estimation function with the conventional channel estimation function. Both estimations are performed using the same reference signal resources, combining multiple measurement objectives into a single unified process that reduces overall overhead while achieving both measurement goals
Data Source
AI summary
The present invention relates to a wireless access system supporting a full duplex radio (FDR) transmission environment. A method by which a first UE receives a signal from a base station in a wireless access system supporting FDR transmission, according to one embodiment of the present invention, can comprise the steps of: receiving a first reference signal from the base station; calculating first channel information on self-interference by using the first reference signal; receiving a second reference signal from the base station, and receiving a third reference signal from a second UE at the same time as the second reference signal; calculating second channel information from which the self-interference is cancelled, on the basis of the second reference signal, the third reference signal and the first channel information; and receiving the signal by using the second channel information and third channel information on a channel receiving the signal.