Beamforming Precoder Nulling for Satellite Interference
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Solution Overview
Problem
In wireless communication systems, especially in 5G/NR networks, there is a challenge in reducing interference to satellite earth stations while maintaining coverage and performance, as out-of-band emissions from cellular networks can affect satellite operations, leading to potential interference and performance degradation.
Innovation Solution
The implementation of directional beam nulling for SRS-based data beams, using zero-forcing (ZF) and singular-value-decomposition (SVD) beamforming algorithms to suppress signals in the direction of satellite earth stations, thereby reducing interference while maintaining coverage and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If directional beam nulling is implemented to reduce interference to satellite earth stations, then interference reduction is achieved, but beamforming complexity increases
Solution Approach 1:
The system pre-calculates steering vectors towards satellite earth stations and incorporates them into the precoder design before actual data transmission. By performing this nulling preparation in advance based on known satellite locations, the system reduces interference without requiring complex real-time adjustments during transmission
Solution Approach 2:
The patent introduces steering vectors as an intermediary mathematical construct that represents the spatial direction to satellite earth stations. These steering vectors serve as a bridge between the known satellite locations and the beamforming algorithm, enabling the precoder to null interference in satellite directions through vector operations rather than direct complex control
2Object-affected harmful factors
If beamforming precoders are designed to null data beams in satellite directions, then satellite interference is reduced, but computational complexity increases
Solution Approach 1:
The system pre-calculates steering vectors towards satellite earth stations and incorporates them into the precoder design before actual data transmission. By performing this nulling preparation in advance based on known satellite locations, the system reduces interference without requiring complex real-time adjustments during transmission
Solution Approach 2:
The patent introduces steering vectors as an intermediary mathematical construct that represents the spatial direction to satellite earth stations. These steering vectors serve as a bridge between the known satellite locations and the beamforming algorithm, enabling the precoder to null interference in satellite directions through vector operations rather than direct complex control
Data Source
AI summary
An apparatus in a wireless communication system is configured to perform a method for directional beam nulling of SRS-based data beams. A base station (BS) includes a transceiver and a processor. The processor is configured to transmit a data beam to at least one user equipment (UE). The processor is also configured to configure the data beam to have a null area in a direction of a satellite earth station (ES), the null area defining a space within a coverage area of the data beam in which a signal from the data beam is suppressed. The data beam is configured by: generating one or more steering vectors to the ES; obtaining a UE channel matrix via a sounding reference signal (SRS) and determining a rank value; and generating a beamforming precoder configured to directional null the data beam in the direction of the ES.