Co-Channel Interference Cancellation via Channel Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current co-channel interference cancellation solutions in full duplex technology result in high spectrum overheads and reduced spectrum utilization due to large channel lengths and centralized interference signal energy, making them inefficient for reliable signal sending and receiving.
Innovation Solution
A method that filters co-channel interference based on a preset interference strength threshold, groups effective interference into subgroups, delays reference interference signals, and uses adaptive interference reconstruction filters to overlay and subtract reconstructed interference signals from received signals, effectively canceling interference and reducing spectrum consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the full duplex technology is used to simultaneously send and receive signals on the same frequency, then spectrum utilization is doubled, but co-channel interference is generated between transmit and receive antennas
Solution Approach 1:
The patent segments the long interference channel into multiple shorter sub-channels based on the clustered distribution of interference signal energy. By dividing the channel into segments corresponding to different reflection points, the system can process interference cancellation in smaller, more manageable units, reducing the complexity of channel estimation while maintaining effective interference suppression.
2Reliability
If estimation is performed on the overall interference channel with large channel length, then co-channel interference can be canceled, but spectrum overheads are high and spectrum utilization is greatly reduced
Solution Approach 1:
The patent divides the overall interference channel into multiple sub-channels based on the clustered energy distribution characteristics. Instead of estimating one long channel requiring extensive pilot sequences, the system estimates multiple shorter sub-channels, significantly reducing spectrum overhead while maintaining interference cancellation effectiveness.
Solution Approach 2:
The patent applies local quality by focusing estimation resources on specific regions where interference energy is concentrated. By identifying and estimating only the significant sub-channels corresponding to actual reflection points rather than the entire channel, the system achieves efficient use of spectrum resources while maintaining accurate interference cancellation where it is most needed.
3Reliability
If a protection interval of channel length magnitude is inserted to balance the overall interference channel, then interference can be managed, but spectrum overheads are high
Solution Approach 1:
The patent avoids the need for long protection intervals by segmenting the channel into sub-channels. Each sub-channel can be processed independently with much shorter protection intervals, thereby maintaining channel balancing capability while dramatically reducing the total protection overhead and improving spectrum utilization.
4Loss of information
If the channel length is large and interference signal energy is centralized near reflection points, then interference has specific spatial characteristics, but current solutions still require high spectrum overheads
Solution Approach 1:
The patent exploits the localized nature of interference energy by applying local quality principles. It focuses processing resources on specific spatial regions (sub-channels) where interference energy is concentrated near reflection points, rather than uniformly processing the entire long channel. This localized approach maintains accurate representation of interference characteristics while reducing overall computational and spectral resources required.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Embodiments of the present invention disclose a co-channel interference cancellation method and apparatus. The method includes: obtaining effective interference by filtering co-channel interference according to a preset interference strength threshold, and obtaining a plurality of effective interference subgroups by grouping the effective interference; obtaining a reference interference sub-signal corresponding to the effective interference subgroup, by delaying a reference interference signal according to a determined interference delay of each effective interference subgroup; after each reference interference sub-signal passes through a corresponding adaptive interference reconstruction filter, obtaining a reconstructed interference signal by overlaying each reference interference sub-signal; and performing a subtraction operation on a received signal and the reconstructed interference signal. It can be learned that, in the embodiments of the present invention, a plurality of ineffective interference may be canceled by using an interference strength threshold, and effective interference obtained after the ineffective interference is canceled is grouped into a plurality of effective interference subgroups, that is, a channel with a large length is divided into a plurality of sub-channels with a relatively short length, and a same operation is performed on each sub-channel. In this way, spectrum consumption is greatly reduced, and implementation is simple.