Uplink MIMO Precoding Matrix Selection for 8-Antenna Codebooks
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Solution Overview
Problem
Existing uplink MIMO transmission systems are limited to 4-antenna ports, leading to increased codeword numbers and TPMI overhead as transmission demands evolve, necessitating improved precoding matrix selection and indication schemes for enhanced MIMO systems.
Innovation Solution
A method for determining a precoding matrix involves constructing an 8-antenna port codebook from 4- or 2-antenna port codebooks using codebook coefficients, and employing TPMI to indicate the required precoding matrix, enabling efficient uplink transmission with increased antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antenna ports is increased from 4 to 8 to meet evolving transmission demands, then the system capacity and MIMO performance are improved, but the codebook size and TPMI overhead increase significantly
Solution Approach 1:
The patent segments the 8-antenna port codebook into multiple subcodebooks, each corresponding to different antenna port configurations (e.g., 8-port, 4-port, 2-port combinations). This segmentation allows the system to select appropriate subcodebooks based on actual transmission needs, avoiding the need to maintain a complete large-scale codebook while still supporting 8-antenna port operations.
Solution Approach 2:
The patent employs a nested structure where 8-antenna port codebook entries are constructed by combining 4-antenna port and 2-antenna port codebook entries through codebook coefficients. This nesting approach allows the 8-port codebook to be built from smaller, more manageable sub-codebooks, reducing overall storage requirements while maintaining full functionality.
2Adaptability or versatility
If the codebook size is increased to support 8-antenna port transmission, then the precoding matrix selection flexibility is improved, but the TPMI indication overhead increases
Solution Approach 1:
The patent divides the precoding matrix indication into multiple parts by segmenting the codebook into subcodebooks. Each subcodebook can be indicated using a separate TPMI field, allowing the system to indicate only the relevant subcodebook portion needed for current transmission, thereby reducing total indication overhead while preserving selection flexibility across all 8 antennas.
Solution Approach 2:
The patent introduces codebook coefficients as an additional dimension for codebook construction. Instead of directly indexing into a large monolithic codebook, the system uses coefficients to dynamically construct or select from multiple smaller subcodebooks, effectively adding a layer of indirect addressing that reduces TPMI overhead while maintaining access to diverse precoding matrices.
3Device complexity
If existing 4-antenna port codebooks are used without modification, then the system complexity is kept low, but the system cannot meet enhanced MIMO transmission requirements
Solution Approach 1:
The patent makes the codebook construction method universal by designing a framework that can accommodate different antenna port configurations (2-port, 4-port, and 8-port) using the same underlying principles. The codebook coefficients and subcodebook structures can be adapted to various MIMO scenarios, allowing a single codebook construction mechanism to serve multiple antenna configurations without requiring separate dedicated codebooks for each case.
Solution Approach 2:
The patent implements nesting by constructing 8-antenna port codebook entries from nested combinations of 4-antenna and 2-antenna port codebook entries. This nested structure allows the system to maintain compatibility with existing smaller codebooks while extending functionality to support larger antenna configurations, effectively building complex capabilities from simpler, proven components.
Data Source
AI summary
A method for determining a precoding matrix for uplink MIMO transmission is provided. The method includes: determining a codebook coefficient used for constructing an 8-antenna port codebook by using a 4-antenna port codebook and/or a 2-antenna port codebook; according to the codebook coefficient, determining a first precoding matrix required for uplink transmission of a terminal device; and pre-encoding data according to the first precoding matrix, and sending pre-encoded data to a network device.