Non-linear Precoding Interference Measurement for Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face limitations in mitigating interference among data streams using linear-precoding techniques, especially when the number of transmissions exceeds the available orthogonal sequences, leading to suboptimal throughput and channel robustness.
Innovation Solution
The implementation of a method and apparatus for wireless communication that utilizes non-linear precoding techniques by configuring multiple resources for interference management, where user equipment (UE) receives reference signals with different precoding filter settings to measure interference from both lower-layer and higher-layer data streams, enabling accurate interference measurement and reporting, which is used by the base station to determine a more optimal modulation and coding scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If linear-precoding techniques are used to mitigate interference among data streams, then interference mitigation is achieved, but the number of transmissions is limited by the quantity of available orthogonal sequences
Solution Approach 1:
The patent changes the fundamental parameter of precoding from linear to non-linear, enabling the system to support more transmissions than orthogonal sequences by using interference measurement and cancellation techniques that do not rely on orthogonal sequence limitations
Solution Approach 2:
The patent introduces reference signals as an intermediary element that enables interference measurement. These reference signals allow the receiving UE to measure and report interference levels, which are then used by the base station to adjust precoding and mitigate interference without being constrained by orthogonal sequence availability
2Productivity
If non-linear precoding techniques are used to increase the number of transmissions, then throughput is improved, but interference measurement becomes more complex
Solution Approach 1:
The patent segments interference measurement into distinct components by using separate reference signals for different layers and UEs. This segmentation allows the receiving UE to measure interference from specific sources (lower-layer UEs, higher-layer UEs) independently, simplifying the overall measurement process despite the non-linear precoding complexity
Solution Approach 2:
The patent implements a feedback mechanism where the receiving UE measures interference using reference signals and reports the measurements back to the base station. This feedback loop enables the base station to adjust precoding settings to optimize throughput while maintaining manageable interference measurement complexity
3Measurement precision
If multiple reference signals with different precoding filter settings are transmitted, then interference measurement accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent makes reference signals multi-functional by designing them to serve both channel estimation and interference measurement purposes. The same reference signals transmitted with different precoding filter settings are used to measure both the desired signal characteristics and the interference from other layers, reducing the need for separate dedicated interference measurement signals
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some systems, a base station may configure multiple types of resources at a user equipment (UE) for interference management processing at the UE in examples in which the base station employs a non-linear precoding technique. The multiple types of resources configured by the base station may include a first resource type configured for measuring channel gain at the UE, a second resource type configured for measuring non-linear interference at the UE arising from lower-layer data streams, and a third resource type configured for measuring linear interference at the UE arising from higher-layer data streams. The base station may transmit one or more reference signals to the UE over each of the multiple resource types and the UE may determine both a non-linear interference measurement and a linear interference measurement based on receiving the reference signals.