Cross-Terminal Interference Cancellation in Full-Duplex Terminals
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Solution Overview
Problem
In wireless full-duplex communication systems, existing interference cancellation methods primarily focus on self-interference cancellation in point-to-point scenarios, failing to effectively address interference between terminals in point-to-multipoint scenarios, which disrupts the reception of wanted signals.
Innovation Solution
The proposed solution involves determining and canceling interference signals between terminals by estimating channel parameters from the transmit antenna of one terminal to the receive antenna of another, using separate resources for signal reception and reconstruction information exchange to isolate and remove interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless full-duplex technology is used to transmit and receive signals simultaneously on the same radio channel, then spectral efficiency is doubled, but self-interference from transmit signal to receive signal occurs
Solution Approach 1:
The patent segments the interference cancellation process into multiple stages: analog domain cancellation using passive structures (absorptive materials, isolation walls) and digital domain cancellation using signal processing algorithms. This multi-level segmentation allows simultaneous full-duplex operation by addressing interference at different processing stages.
Solution Approach 2:
The patent introduces an intermediary interference cancellation mechanism that includes passive isolation structures (absorptive materials, isolation walls) placed between transmit and receive antennas, along with active digital signal processing components that act as mediators to suppress self-interference before it affects the receive signal.
2Object-generated harmful factors
If existing self-interference cancellation methods are applied in point-to-point scenarios, then self-interference is reduced, but interference between terminals in point-to-multipoint scenarios is not addressed
Solution Approach 1:
The patent develops a universal interference cancellation framework that handles both self-interference in point-to-point scenarios and cross-terminal interference in point-to-multipoint scenarios. The digital signal processing architecture is designed to be multi-functional, accommodating different interference types through configurable cancellation algorithms that work across various network topologies.
Solution Approach 2:
The patent implements dynamic interference cancellation where the system adapts its cancellation strategy based on the operational scenario. The digital signal processor dynamically adjusts cancellation parameters and algorithms depending on whether the scenario is point-to-point or point-to-multipoint, making the solution flexible and scenario-specific.
3Object-generated harmful factors
If channel parameter estimation is performed to cancel interference signals between terminals, then cross-terminal interference is reduced, but additional signaling resources and processing complexity are required
Solution Approach 1:
The patent performs channel parameter estimation and interference signal reconstruction in advance before the actual data reception. By pre-characterizing the interference channel and preparing cancellation parameters beforehand, the system reduces real-time processing complexity during actual communication while still achieving effective cross-terminal interference cancellation.
Data Source
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AI summary
The present invention discloses an interference cancellation method and a terminal, where the method includes: determining, by a first terminal, a channel parameter from a transmit antenna of a second terminal to a receive antenna of the first terminal; receiving, by the first terminal, a first signal by using a first resource, where the first signal includes a first interference signal and a wanted signal that is from a base station, and the first interference signal is an interference signal generated when the second terminal sends a second signal to the base station by using the first resource; and determining, by the first terminal, the first interference signal in the first signal according to the channel parameter, and canceling the first interference signal. According to the interference cancellation method and the terminal in the embodiments of the present invention, cancellation of an interference signal that is in a signal received by an interfered terminal and that is between terminals can be implemented by using a channel parameter between an interfering terminal and the interfered terminal.