Frequency-Selective Signal Manipulator for Multicarrier Interference Nulling
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Solution Overview
Problem
Conventional spatial nulling methods for wideband multicarrier communication systems face challenges in efficiently canceling interference due to high complexity and the need for modifications to the receiver, which is often not feasible.
Innovation Solution
A frequency-selective signal manipulator is introduced to concentrate data transmissions in subsets of frequency bands where spatial nulling is more effective, using a programmable multi-band BPF or band-limited noise injectors, allowing for adaptive interference cancellation without modifying the standard receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional spatial nulling methods are applied to wideband multicarrier systems, then interference cancellation capability is improved, but system complexity increases and receiver modifications are required
Solution Approach 1:
The frequency spectrum is divided into multiple subsets, and data transmissions are concentrated in specific frequency bands where spatial nulling is more effective. This segmentation allows the system to apply spatial nulling selectively rather than across the entire wideband spectrum, reducing complexity while maintaining interference cancellation capability.
Solution Approach 2:
A frequency-selective signal manipulator is introduced as an intermediary component between the transmitter and the spatial nulling device. This manipulator pre-processes the signal by concentrating it in specific frequency bands, enabling the spatial nulling device to operate more effectively without requiring complex wideband processing.
2Object-affected harmful factors
If conventional spatial nulling methods are applied to wideband multicarrier systems, then interference cancellation capability is improved, but receiver modifications are required
Solution Approach 1:
Instead of modifying the receiver to implement spatial nulling across the entire wideband signal, the approach is inverted: the transmitter side introduces a frequency-selective signal manipulator that pre-concentrates the signal in favorable frequency bands. This allows standard receivers to work with the pre-processed signal without modifications, while still achieving effective spatial interference cancellation.
3Object-affected harmful factors
If data transmissions are concentrated in specific frequency bands, then spatial nulling effectiveness is improved, but frequency utilization efficiency may be reduced
Solution Approach 1:
The system dynamically identifies and selects frequency bands where spatial nulling is most effective, and adapts the concentration of data transmissions to these bands. This dynamic adaptation allows the system to optimize interference cancellation performance while efficiently utilizing the available frequency spectrum, rather than statically restricting transmissions to fixed bands.
Data Source
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AI summary
A system and methods for cancelling spatial interference associated with an original multi-carrier signal carrying at least one data transmission sent by a transmitter to an antenna array comprising a plurality of antennae and having a receiver operatively associated therewith, the system receiving a plurality of received signals respectively including interference and the original signal as received by a respective individual antenna from among the plurality of antennae, the system comprising a spatial nulling device for generating a cleaner signal by reducing at least one spatial component of the interference; and a signal manipulator operative to manipulate a derivative of the received signal so as to cause the at least one data transmission to be more concentrated in a subset of frequency bands in which the spatial nulling device is more effective and to be less concentrated in frequency bands which do not belong to the subset of frequency bands.