Multi-Antenna Precoding Matrix Selection Using Path Loss Information
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Solution Overview
Problem
Current wireless communication systems, particularly in MIMO technology, face inefficiencies in throughput enhancement due to the use of standardized precoding matrices that do not account for loss information of transmission paths or frequency domains, leading to suboptimal signal processing and reception quality.
Innovation Solution
A wireless communication user equipment and method that determines a precoding matrix based on loss information of transmission paths and frequency domains by transmitting a sounding reference signal, receiving a transmit precoding matrix indicator and rank indicator, and allocating gains to each transmission path to optimize multi-antenna transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a standardized precoding matrix is used for multi-antenna transmission, then device complexity is reduced and ease of operation is improved, but spectral efficiency and data rate reliability deteriorate due to inability to account for transmission path loss information and frequency domain variations
Solution Approach 1:
The patent applies parameter changes by determining precoding matrices with different parameters for different frequency domains (resource block groups) rather than using a single standardized matrix. The precoding matrix determination unit selects or determines precoding matrices based on frequency-specific channel conditions, transmission path loss information, and rank indicators, thereby adapting the precoding parameters to match the actual transmission characteristics of each frequency domain.
Solution Approach 2:
The patent implements local quality by applying different precoding matrices to different resource block groups (frequency domains) based on their specific channel conditions. Each frequency domain receives a precoding matrix optimized for its local transmission characteristics, including path loss and channel state, rather than applying a uniform standardized matrix across all frequencies.
2Productivity
If gain allocation based on transmission path loss information is implemented, then spectral efficiency and signal quality are improved, but device complexity and signal processing complexity increase
Solution Approach 1:
The patent applies preliminary action by having the transmission path loss information acquisition unit obtain path loss information for each transmission path in advance, before the actual data transmission. This pre-acquired loss information is then used by the precoding matrix determination unit to select or determine appropriate precoding matrices and by the gain allocation unit to allocate gains to different transmission paths, avoiding the need for complex real-time calculations during transmission.
Solution Approach 2:
The patent uses gain allocation as an intermediary mechanism to simplify the relationship between path loss information and precoding matrix selection. The gain allocation unit processes the path loss information and generates gain values that are applied to the transmission signals, acting as an intermediate step that bridges the gap between raw path loss data and the final precoded transmission, thereby reducing the complexity of direct path loss compensation.
Data Source
AI summary
An operating method of a wireless communication user equipment may include transmitting a sounding reference signal (SRS) to a base station, receiving, from the base station, a transmit precoding matrix indicator (TPMI) indicating a precoding matrix and a rank indicator (RI) indicating a rank value, selecting a precoding matrix, based on the TPMI and the RI, allocating a gain to each of a plurality of transmission paths, based on the precoding matrix and loss information of each of the plurality of transmission paths, and transmitting a physical uplink shared channel (PUSCH) through the plurality of transmission paths.