Uplink MIMO Precoding Matrix Selection for Eight-Antenna Ports
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Solution Overview
Problem
Existing MIMO systems face challenges in supporting increased antenna ports and transmission layers, leading to increased codeword overhead and the need for improved precoding matrix selection and indication schemes.
Innovation Solution
A method and apparatus for determining a precoding matrix for uplink MIMO transmission involving sending an SRS of eight antenna ports, receiving indication information, and precoding data using a target precoding matrix, or sending an SRS and receiving indication information to determine a target precoding matrix, which includes channel estimation and TPMI/codeword coefficient indexing to support eight-antenna-port transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antenna ports is increased from four to eight to support enhanced transmission requirements, then system capacity and transmission performance are improved, but codeword overhead increases
Solution Approach 1:
The precoding matrix indication is segmented into two parts: a first indication information (TPMI) indicating a precoding matrix from a codebook, and a second indication information (coherence group indicator) indicating a coherence group. This segmentation allows the system to efficiently indicate precoding matrices for eight antenna ports by dividing the indication into manageable components, reducing overall overhead while supporting enhanced transmission capacity.
Solution Approach 2:
Instead of directly indicating all precoding matrix parameters for eight antenna ports, the patent inverts the approach by indicating a coherence group first (which groups antenna ports with similar channel characteristics), and then indicating a precoding matrix within that group. This inverted indication strategy reduces overhead by exploiting the coherence structure of the channel.
2Productivity
If the number of uplink transmission layers is increased from four to L to support more data streams, then system throughput is improved, but precoding matrix selection complexity increases
Solution Approach 1:
The patent performs preliminary action by pre-defining coherence groups that associate specific sets of antenna ports with corresponding precoding matrices. This preliminary organization allows the network device to quickly select appropriate precoding matrices for different transmission layers without complex real-time calculations, thereby supporting increased throughput while managing selection complexity.
Solution Approach 2:
The patent changes the parameter representation by introducing coherence group indicators alongside TPMI values. Instead of using a single large-index parameter to select from all possible precoding matrices for eight ports, the system uses a two-parameter approach (coherence group + matrix index within group), which reduces the search space and simplifies matrix selection for multiple transmission layers.
Data Source
AI summary
A method for determining a precoding matrix for uplink MIMO transmission includes sending an SRS of eight antenna ports to a network device; receiving indication information sent by the network device, where the indication information is used for determining a target precoding matrix required for uplink transmission; and precoding data according to the target precoding matrix, and sending the precoded data to the network device.