Self-Interference Cancellation in Distributed Antenna Structures
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Solution Overview
Problem
Full duplex communication systems face significant performance deterioration due to intra-device self-interference, which needs to be effectively cancelled to operate efficiently.
Innovation Solution
A method for self-interference cancellation in user equipment with a distributed antenna structure, involving phase estimation using Reference Signal configuration information, transmitted through an idle transmission module, and performed in the baseband stage for digital self-interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is implemented to double system capacity, then system capacity is improved, but intra-device self-interference deteriorates performance
Solution Approach 1:
The patent divides the antenna system into multiple distributed antenna panels (first panel and second panel) with separate transmission and reception functions. By segmenting the antenna structure and assigning dedicated transmission panels and reception panels, the system can spatially separate transmitted and received signals, thereby reducing self-interference while maintaining full duplex operation capability
Solution Approach 2:
The patent introduces reference signals as an intermediary element to estimate and cancel self-interference. The reference signal transmitted through the idle transmission module serves as a mediator to characterize the self-interference channel, enabling the receiver to reconstruct and subtract the interfering signal from the received signal
2Reliability
If phase estimation is performed using reference signal to cancel self-interference, then self-interference cancellation performance is improved, but device complexity increases
Solution Approach 1:
The patent performs phase estimation using reference signals before the actual data transmission and reception process. By preliminarily characterizing the self-interference channel through reference signal transmission and processing, the system prepares the necessary cancellation parameters in advance, which simplifies the real-time processing during actual communication
Solution Approach 2:
The patent implements a feedback mechanism where the receiver estimates self-interference based on reference signals and feeds back this information to improve cancellation accuracy. The phase estimation results from reference signal processing are used to construct the self-interference signal, which is then subtracted from the received signal to enhance overall system performance
Data Source
AI summary
A method for performing self-interference cancellation by a terminal may comprise the steps of: receiving RS configuration information for phase estimation of self-interference from a base station; when the terminal operates, with a distributed antenna structure, in a full duplex radio (FDR) mode or operates in a space division duplex (SDD) mode between panels, transmitting an RS on the basis of the RS configuration information; and performing phase estimation for self-interference between the panels on the basis of the RS. The terminal is capable of communicating with at least one of another terminal, a terminal related to an autonomous driving vehicle, a base station or a network.