Hierarchical Modulation Interference Cancellation
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Solution Overview
Problem
Wireless communication networks face challenges in increasing capacity while mitigating interference from within cells, neighboring cells, and adjacent radio systems, which affects data transmission reliability and efficiency.
Innovation Solution
The implementation of hierarchical modulation and interference cancellation techniques, where a base modulation layer and an enhancement modulation layer are used concurrently, allowing for interference mitigation and improved data transmission by decoding and canceling the base modulation layer to extract content from the enhancement layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hierarchical modulation with concurrent non-orthogonal data streams is implemented, then data transmission capacity is improved, but interference from multiple sources increases
Solution Approach 1:
The patent applies interference cancellation techniques that convert the harmful interference from concurrent non-orthogonal data streams into a manageable signal component. By detecting and subtracting the interference signals from base stations and other UEs, the system transforms the harmful multi-source interference into a beneficial feature that enables higher capacity transmission through hierarchical modulation layers.
Solution Approach 2:
The patent segments the data transmission into multiple hierarchical modulation layers, where different data streams are transmitted on different layers. This segmentation allows the receiver to process and cancel interference from specific layers independently, managing the complexity of multi-source interference while maintaining high data transmission capacity.
2Reliability
If interference cancellation techniques are applied, then data transmission reliability is improved, but processing complexity increases
Solution Approach 1:
The patent implements preliminary interference detection and estimation before the actual data decoding process. By pre-identifying and characterizing the interference signals from multiple sources, the system prepares cancellation parameters in advance, which simplifies the subsequent decoding process and reduces real-time processing complexity while maintaining high reliability.
Solution Approach 2:
The patent introduces intermediary processing stages that separate interference cancellation from the main data decoding pipeline. These intermediary modules handle the complex interference mitigation tasks independently, allowing the main decoding process to focus on reliable data recovery, thereby managing overall processing complexity while improving reliability.
3Productivity
If multiple modulation layers are transmitted concurrently, then spectral efficiency is improved, but signal detection difficulty increases
Solution Approach 1:
The patent transmits multiple data streams on different hierarchical modulation layers, effectively adding a dimensional separation to the signal structure. This layer-based dimensionality allows the receiver to detect and process signals from different layers independently, reducing detection difficulty while maintaining high spectral efficiency through concurrent transmission.
Data Source
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AI summary
Methods, systems, and devices are described for hierarchical modulation and interference cancellation in wireless communications systems. Various deployment scenarios may be supported that may provide communications on both a base modulation layer as well as in an enhancement modulation layer that is modulated on the base modulation layer, thus providing concurrent data streams that may be provided to the same or different user equipments. Various interference mitigation techniques may be implemented in examples to compensate for interfering signals received from within a cell, compensate for interfering signals received from other cell(s), and/or compensate for interfering signals received from other radios that may operate in adjacent wireless communications network.