Pre-equalizer for Inter-numerology Interference in 5G Systems
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Solution Overview
Problem
Inter-numerology interference (INI) in 5G and beyond communication systems leads to inefficient use of frequency spectrum, complex receiver and transmitter structures, increased power consumption, and decreased communication quality, as existing solutions like protective bands and filters cannot completely eliminate the interference.
Innovation Solution
A method utilizing a pre-equalizer to remove inter-numerology interference by determining the numerologies to be placed in the common frequency band, obtaining the appropriate integer Q, and performing inverse discrete Fourier transforms and cyclic prefix additions to generate multi-numerology signals without protective bands or filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If protective bands are placed between different numerology signals, then inter-numerology interference is reduced, but frequency spectrum efficiency deteriorates
Solution Approach 1:
The patent extracts the interference problem from the frequency domain and addresses it in the time domain through precoding. By calculating and applying a precoding matrix that compensates for inter-numerology interference effects, the system eliminates the need for protective bands while maintaining spectrum efficiency.
Solution Approach 2:
The precoding matrix acts as an intermediary mechanism between the transmitter and receiver. It processes the signals before transmission to pre-compensate for interference, effectively mediating the interaction between different numerology signals without requiring frequency separation.
2Object-affected harmful factors
If filters are used to eliminate inter-numerology interference, then interference is reduced, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical/filter-based interference suppression approach with a signal processing approach using precoding matrices. Instead of using complex filters in the time domain, the system applies linear transformations in the frequency domain to achieve interference elimination with simpler implementation.
Solution Approach 2:
The precoding matrix is calculated and applied in advance at the transmitter before signal transmission. This preliminary action pre-compensates for interference effects, eliminating the need for complex real-time filtering at the receiver and reducing overall system complexity.
3Object-affected harmful factors
If filters are used to filter signal extensions, then inter-numerology interference is reduced, but power consumption increases
Solution Approach 1:
The patent replaces power-intensive filter operations with computationally efficient matrix multiplication in the frequency domain. The precoding approach uses simple linear algebra operations that consume significantly less power compared to real-time filtering operations.
Solution Approach 2:
By performing interference compensation calculations in advance at the transmitter, the system avoids the need for continuous power-intensive filtering operations at the receiver. The precoding matrix is pre-calculated and applied once per transmission, reducing ongoing power consumption.
Data Source
AI summary
This invention relates to a method for removing inter-numerology interference in transmitters and base stations in down-link situations in 5G and beyond multi-numerology systems, and a pre-equalizer (5) adapted to operate this method.