Spur-Aware Channel Estimation for High-Order Wireless Reception
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently mitigating the effects of transmission spurs without consuming computing resources or causing delays, particularly when using high-order modulation schemes like 4K QAM, which require a high signal-to-noise ratio.
Innovation Solution
A network node provides an indication of transmission spur frequency locations to a user equipment (UE), allowing the UE to estimate channels and noise based on these locations, excluding subcarriers with spurs and using interpolation techniques to mitigate the effects of transmission spurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs channel estimation and noise estimation without knowledge of transmission spur locations, then the computational complexity is high and transmission delays occur, but the mitigation of transmission spur effects is insufficient
Solution Approach 1:
The network node performs preliminary identification of transmission spur frequency locations and provides this information to the UE before the UE performs channel estimation and noise estimation. This allows the UE to exclude known spur locations from estimation calculations, reducing computational complexity while improving reliability by accurately mitigating spur effects.
Solution Approach 2:
The network node acts as an intermediary that identifies transmission spur locations and communicates this information to the UE. This intermediary role allows the UE to benefit from the network node's identification capabilities without bearing the full computational burden, resolving the contradiction between mitigation effectiveness and device complexity.
2Reliability
If the UE performs channel estimation and noise estimation without knowledge of transmission spur locations, then computational resources are consumed and transmission delays occur, but the signal-to-noise ratio requirement for high-order modulation schemes is not met
Solution Approach 1:
The network node performs preliminary identification and communication of transmission spur locations before the UE performs estimation operations. This preliminary action allows the UE to efficiently exclude spur frequencies from channel and noise estimation, achieving the required signal-to-noise ratio for high-order modulation schemes without incurring transmission delays.
Solution Approach 2:
The UE extracts and excludes the identified transmission spur frequency locations from the channel estimation and noise estimation processes. By removing these harmful frequency components from the estimation calculations, the UE achieves accurate signal-to-noise ratio measurements necessary for high-order modulation while avoiding the delays associated with traditional approaches.
3Measurement precision
If traditional channel estimation methods are used without excluding transmission spur frequencies, then the process is simple, but the estimation accuracy is degraded due to spur interference
Solution Approach 1:
The network node provides preliminary information about transmission spur frequency locations to the UE before the estimation process. This allows the UE to perform accurate channel estimation by excluding known spur frequencies, achieving high measurement precision without significantly increasing process complexity since the spur locations are already identified and communicated.
Solution Approach 2:
The channel estimation process is segmented into two parts: frequencies identified as transmission spurs (excluded from estimation) and non-spur frequencies (used for estimation). This segmentation allows the UE to focus computational resources only on clean frequency components, improving estimation accuracy while keeping the overall process manageable in complexity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of transmission spur frequency locations associated with transmissions of a network node. The UE may receive a communication from the network node, receiving the communication comprising performing one or more of channel estimation or noise estimation based at least in part on the transmission spur frequency locations. Numerous other aspects are described.