LOS MIMO Precoding Codebooks for Antenna-Aware Precoder Selection
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G NR, face challenges in optimizing precoder selection for line-of-sight (LOS) multiple-input-multiple-output (MIMO) scenarios, which affect communication efficiency and reliability.
Innovation Solution
A method and apparatus for selecting and utilizing codebook-based precoders based on antenna configurations for LOS MIMO communication, enabling effective communication between base stations and wireless devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If codebook-based precoders are selected for LOS MIMO communication, then spectral efficiency and multiplexing gains are improved, but communication reliability may be compromised due to suboptimal precoder selection in line-of-sight conditions
Solution Approach 1:
The patent modifies the codebook structure by introducing LOS-specific parameters and configuration options that adapt the precoder selection to line-of-sight channel characteristics, thereby improving reliability while maintaining spectral efficiency gains
Solution Approach 2:
The system dynamically selects between different codebook configurations based on LOS detection and channel conditions, allowing adaptive optimization of precoder selection to balance spectral efficiency and communication reliability in real-time
2Device complexity
If existing codebook-based precoding methods are used in LOS MIMO scenarios, then device complexity is reduced through standardized codebooks, but communication efficiency deteriorates due to lack of optimization for line-of-sight conditions
Solution Approach 1:
The patent segments the codebook into multiple configurations tailored for different LOS scenarios, allowing selective application of optimized precoders while maintaining overall system simplicity through structured organization
Solution Approach 2:
The enhanced codebook structure serves multiple functions by accommodating both traditional MIMO and LOS-specific precoding requirements within a unified framework, improving communication efficiency without requiring separate systems
3Ease of operation
If traditional precoder selection methods are applied to LOS MIMO, then ease of operation is maintained through standard procedures, but multiplexing gains are lost due to inadequate adaptation to line-of-sight channel characteristics
Solution Approach 1:
The patent pre-configures LOS-optimized precoders in the codebook based on anticipated line-of-sight channel characteristics, enabling direct selection without complex real-time optimization while capturing multiplexing gains through advance preparation
Data Source
AI summary
A base station may identify a first antenna configuration of the base station and a second antenna configuration of a wireless device. The base station may select one or more codebook-based precoders for communication with the wireless device with LOS MIMO. The one or more codebook-based precoders may include at least one of a Legendre precoder, a block-DFT precoder, a DFT precoder, a block-Walsh precoder, a Walsh precoder, a block-Legendre precoder, a Kronecker Legendre precoder, a Kronecker block-DFT precoder, or a Kronecker block-Walsh precoder. The base station may transmit, to a wireless device, an indication of a second codebook-based precoder for transmission from the wireless device to the base station with LOS MIMO. The base station and the wireless device may communicate with each other with LOS MIMO based on one or more codebook-based precoders.