Uplink Subband Precoding for Frequency-Selective PUSCH
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Solution Overview
Problem
Current 5G wireless communication systems face reduced PUSCH transmission performance due to wideband precoding that fails to match frequency-domain channel changes, leading to interference and reduced uplink edge coverage and capacity, especially in multi-antenna and multi-user scenarios.
Innovation Solution
Implementing subband precoding by dividing the frequency domain into smaller resource units, such as subbands, and using precoding matrices tailored to each unit, indicated by TPMI or SRI, to adapt to channel variations and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wideband precoding is used, then device complexity is reduced, but PUSCH transmission performance deteriorates due to inability to match frequency-domain channel changes
Solution Approach 1:
The frequency domain is divided into multiple subbands, and separate precoding matrices are designed for each subband. This segmentation allows the precoding to adapt to frequency-domain channel variations while maintaining manageable complexity through modular processing.
Solution Approach 2:
Different precoding matrices are applied to different subbands based on local channel characteristics. Each subband receives optimized precoding tailored to its specific frequency-domain channel conditions, improving overall transmission performance.
2Loss of information
If wideband precoding is used, then signaling overhead is reduced, but interference increases due to inability to adapt to channel changes
Solution Approach 1:
The frequency domain is segmented into subbands, each with its own precoding matrix. This enables adaptive interference mitigation in each subband while keeping signaling overhead manageable through efficient representation methods.
Solution Approach 2:
Precoding parameters are changed across different subbands to match channel conditions. By adjusting precoding matrices per subband, the system adapts to channel variations and reduces interference without requiring excessive signaling.
3Productivity
If wideband precoding is used, then uplink capacity is reduced, but precoding design simplicity is improved
Solution Approach 1:
The frequency domain is divided into subbands with separate precoding matrices, increasing uplink capacity through better channel matching. The segmented approach keeps design complexity manageable by processing each subband independently.
Solution Approach 2:
Each subband receives locally optimized precoding designed according to its specific channel characteristics. This local optimization improves overall uplink capacity while maintaining reasonable design complexity through modular subband processing.
Data Source
AI summary
An information receiving method and apparatus, and an information sending method and apparatus are disclosed. The information receiving method includes: A terminal device receives first configuration information from a network device, where the first configuration information carries precoding indication information of each resource unit of N resource units allocated to the terminal device; and the terminal device performs precoding processing on uplink data carried on each resource unit by a precoding matrix corresponding to the precoding indication information of each resource unit, based on the first configuration information. In this method, the terminal device determines, based on the precoding indication information, a quantity N and sizes of the resource units obtained through division.