Precoding Granularity Adaptation for Channel Estimation
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Solution Overview
Problem
In communication systems, determining a reasonable precoding granularity is challenging as it must balance precoding gain and channel estimation performance, with larger granularities improving interpolation but reducing matching with the channel.
Innovation Solution
A method and device that determine a first precoding granularity based on the numerology used for signal transmission, matching the precoding granularity with the numerology to achieve a balance between precoding gain and channel estimation performance, by associating numerology with specific precoding granularities through pre-configured or dynamically determined correspondences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a larger precoding granularity is used, then the frequency-domain bandwidth for interpolation increases and channel estimation accuracy improves, but the matching degree between precoding and channel decreases, limiting precoding gain
Solution Approach 1:
The patent applies dynamics by making the precoding granularity adaptable rather than fixed. The terminal device determines the precoding granularity dynamically based on channel conditions, allowing the system to switch between larger granularities (for better interpolation when channel varies slowly) and smaller granularities (for better precoding matching when channel varies quickly), thus resolving the contradiction between channel estimation accuracy and precoding gain
Solution Approach 2:
The patent applies parameter changes by adjusting the precoding granularity parameter according to channel characteristics. The terminal device changes the precoding granularity parameter based on measured channel conditions, selecting appropriate granularity values to balance the trade-off between interpolation performance and precoding matching degree under different channel scenarios
2Reliability
If a smaller precoding granularity is used, then the matching degree between precoding and channel improves, but the frequency-domain bandwidth for interpolation decreases, reducing channel estimation accuracy
Solution Approach 1:
The patent applies dynamics by enabling the system to adapt precoding granularity to changing channel conditions. When channel variations are rapid, smaller granularities are selected to maintain precoding matching; when channel variations are slow, larger granularities are selected to improve interpolation efficiency, thus dynamically balancing the contradiction
Solution Approach 2:
The patent applies parameter changes by adjusting the precoding granularity parameter based on channel characteristics. The terminal device monitors channel conditions and changes the granularity parameter accordingly, selecting smaller values for high-frequency channel variations and larger values for low-frequency variations, thereby resolving the trade-off between precoding gain and estimation accuracy
Data Source
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AI summary
A signal transmission method and apparatus, capable of determining suitable precoding granularity to enable a balance between a precoding gain and channel estimation performance. The method comprises: a first apparatus determining a first basic parameter set employed for transmitting a signal; the first apparatus determining, according to the first basic parameter set, first precoding granularity employed for transmitting the signal; and using the first precoding granularity to transmit the signal between the first apparatus and a second apparatus.