Analog Precoding Matrix Indication for Uplink MIMO
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting uplink transmissions due to limitations in precoding matrix indication methods, which affect the accuracy and efficiency of multiple-input multiple-output (MIMO) operations in 5G and New Radio (NR) networks.
Innovation Solution
The proposed solution involves using an analog precoding matrix indication, where a network node transmits an analog precoding matrix to a user equipment (UE), allowing the UE to determine a precoding matrix for a physical uplink shared channel (PUSCH) transmission, reducing the need for explicit digital signaling and enabling more accurate precoding without quantization limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital precoding matrix indication is used, then the precoding matrix can be explicitly signaled to the UE, but the precision is limited by quantization and the control channel overhead increases
Solution Approach 1:
The patent replaces digital signaling mechanisms with analog signaling by transmitting the precoding matrix indication through the physical downlink shared channel (PDSCH) as part of the downlink data transmission. This analog approach allows the UE to derive the precoding matrix directly from the received signal characteristics without relying on quantized digital indices, thereby eliminating quantization loss and reducing control channel overhead while maintaining high precision.
2Adaptability or versatility
If digital precoding matrix indication is used, then the precoding matrix can be explicitly signaled, but the system flexibility is constrained by discrete signaling options
Solution Approach 1:
The patent substitutes discrete digital signaling with continuous analog signaling through the PDSCH. This enables the system to indicate any precoding matrix within the codebook without being constrained by discrete signaling options, thereby maximizing adaptability and versatility while simplifying the signaling mechanism by integrating it into the existing data channel infrastructure.
3Measurement precision
If analog precoding matrix indication is used, then quantization limitations are eliminated and precision is improved, but the implementation complexity increases
Solution Approach 1:
The patent leverages the existing PDSCH infrastructure to carry the precoding matrix indication, making the downlink data channel serve multiple functions: both data transmission and precoding indication. This multi-functionality approach eliminates the need for separate analog indication channels, thereby improving precision without significantly increasing implementation complexity.
Data Source
AI summary
In some implementations, a user equipment (UE) may receive, from a network node, an analog precoding matrix indication . The UE may transmit, to the network node, a physical uplink shared channel (PUSCH) transmission based at least in part on a precoding matrix, wherein the precoding matrix is based at least in part on the analog precoding matrix indication.