NOMA Power Perturbation for Interference Separation
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Solution Overview
Problem
In wireless communications, especially in non-orthogonal multiple access (NOMA) systems, path loss and non-line-of-sight losses limit coverage area, and existing methods struggle to efficiently manage transmission power across multiple layers to enhance diversity and separate signals effectively.
Innovation Solution
The implementation of perturbation patterns across transmission layers, including power perturbation, delay insertion, and random precoding, to differentiate power levels and improve decoding performance, with configurations based on transmission characteristics, antenna ports, and priority levels, allowing for single or multiple antenna port transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmission layers are used in NOMA systems, then system capacity and coverage area are improved, but signal separation difficulty and interference increase
Solution Approach 1:
The patent applies power perturbation patterns that dynamically change the power allocation parameters across different transmission layers. By introducing controlled variations in power levels according to predefined patterns, the system maintains high capacity while creating distinguishable power differences that facilitate signal separation at the receiver side.
Solution Approach 2:
The patent pre-configures perturbation patterns and power allocation schemes before transmission. The receiver is provided with information about the perturbation patterns applied to different layers, enabling it to perform effective signal separation and interference cancellation by anticipating the power distribution structure before actual signal processing.
2Area of stationary object
If transmission power is increased to overcome path loss, then coverage area is improved, but interference between layers and energy consumption increase
Solution Approach 1:
The patent applies different perturbation patterns to different transmission layers, creating local quality differences in power distribution. Each layer experiences a unique power perturbation pattern, which allows the system to maintain high transmission power for coverage while ensuring that each layer remains distinguishable through its specific power characteristics, thereby reducing inter-layer interference.
3Reliability
If perturbation patterns are applied to differentiate power levels, then signal diversity and decoding performance are improved, but system complexity and computational overhead increase
Solution Approach 1:
The patent employs periodic perturbation patterns that repeat across transmission blocks. This periodic structure allows the receiver to efficiently track and decode signals by leveraging the predictable, repeating nature of the perturbations, reducing computational complexity compared to completely random or aperiodic power variations while maintaining signal diversity.
4Area of stationary object
If beamforming is used to compensate for path loss, then coverage area is improved, but hardware complexity and cost increase
Solution Approach 1:
The patent replaces hardware-based beamforming mechanisms with software-based power perturbation techniques. Instead of relying on complex antenna array configurations and signal processing hardware to achieve coverage extension, the system uses computational power allocation strategies that achieve similar coverage improvement while reducing hardware complexity and cost.
Data Source
AI summary
Systems, methods, and instrumentalities are provided that are associated with multi-layer transmissions such as multi-layer NOMA transmissions. A per-layer perturbation pattern may be applied to the multiple layers to create differences among the transmission power levels of the layers. MAS and NOMA resource indications may be provided, e.g., through TCI state. Dynamic MAS and NOMA resource indications may be provided. Uplink CSI-RS techniques may be provided, e.g., for interference measurement.