Uplink Interference Suppression via Pre-coding Vector Optimization
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Solution Overview
Problem
Existing cellular communication systems face challenges in effectively controlling and managing interference between Device-to-Device (D2D) communication and cellular communication, particularly when spectrum resources are multiplexed, which affects spectral efficiency and capacity.
Innovation Solution
An uplink interference inhibition method is introduced, where an objective function is established to solve for a pre-coding vector that minimizes interference by optimizing the ratio of available signal power to interference and noise power, and constraints are set to ensure the pre-coding vector is unitary or within specific power thresholds, thereby reducing interference between D2D and cellular uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spectrum resources of cellular communication are multiplexed in D2D communication, then spectral efficiency and system capacity are improved, but interference between D2D transmission and cellular uplink increases
Solution Approach 1:
The patent changes the parameter of pre-coding vector design by introducing an objective function that optimizes the ratio of available signal power to interference plus noise power. This parameter optimization enables the system to achieve better spectral efficiency while controlling interference levels through mathematical optimization of transmission parameters
Solution Approach 2:
The patent converts the harmful interference effect into a beneficial optimization opportunity by formulating an objective function that explicitly considers interference power. By maximizing the signal-to-interference-plus-noise ratio, the system transforms the interference problem into a design constraint that guides optimal pre-coding vector selection, thereby improving overall system performance
2Object-generated harmful factors
If pre-coding vector is optimized to minimize interference, then interference to cellular uplink is reduced, but system complexity increases due to optimization constraints
Solution Approach 1:
The patent extracts the interference minimization objective from the complex multi-objective optimization problem and formulates it as a dedicated objective function focusing on the ratio of signal power to interference plus noise power. This extraction simplifies the problem structure by separating the interference control objective from other system requirements, making the optimization more tractable
Solution Approach 2:
The patent segments the optimization problem by imposing a unitary matrix constraint on the pre-coding vector, which decomposes the complex optimization into more manageable components. This segmentation allows the use of efficient algorithms that exploit the structured constraint, reducing computational complexity while maintaining interference minimization performance
Data Source
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AI summary
The present invention provides an uplink interference inhibition method and user equipment, in the method, an objective function is established, and a pre-coding vector of the UE signal transmission is solved according to the objective function under a constraint condition, such that the available signal power of the UE is the larger the better, and the interference of D2D signal transmission to cellular uplink is the smaller the better; or the interference of the UE to cellular uplink is within the first threshold and the reliability of the UE signal transmission is the best, thus in the case of multiplexing spectrum resources of cellular communication in D2D communication, the interference between the D2D transmission link and the cellular uplink transmission link may be inhibited by means of the design of the pre-coding vector of the UE signal transmission; as a result, the spectral efficiency and capacity of the system are greatly improved.