Grouped CDD Precoding for MIMO Signal Quality
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional MIMO-OFDM systems fail to adaptively choose a CDD precoding code word that meets the varying channel conditions and service requirements of user terminals, particularly for those moving at high speeds, leading to suboptimal signal transmission quality.
Innovation Solution
User terminals are grouped based on channel attributes and service requirements, with tailored precoding code words and cyclic delays assigned to each group, allowing for customized CDD precoding that better fits the specific needs of each group, thereby improving signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single precoding code word and cyclic delay are used for all user terminals in the cell, then the device complexity is reduced and ease of operation is improved, but the adaptability to different channel conditions and service requirements deteriorates
Solution Approach 1:
The invention segments user terminals into different groups based on their channel attributes and service requirements. Each group is assigned a specific precoding code word and cyclic delay from the codebook, rather than using a single configuration for all users. This segmentation allows the system to adapt to different channel conditions while maintaining manageable complexity through group-based configuration.
Solution Approach 2:
The invention applies local quality by tailoring the precoding code word and cyclic delay to match the specific channel characteristics of each user group. Different groups receive different precoding configurations that are locally optimized for their particular channel conditions, service requirements, and mobility patterns, thereby improving overall system adaptability.
2Adaptability or versatility
If user terminals are divided into groups with tailored precoding code words and cyclic delays, then the adaptability to channel conditions and service requirements is improved, but the device complexity and computational burden increase
Solution Approach 1:
The invention segments user terminals into different groups based on their channel attributes and service requirements. Each group is assigned a specific precoding code word and cyclic delay from the codebook, rather than using a single configuration for all users. This segmentation allows the system to adapt to different channel conditions while maintaining manageable complexity through group-based configuration.
Solution Approach 2:
The invention changes the precoding parameters (code word index and cyclic delay value) according to the group to which each user terminal belongs. By adjusting these parameters based on channel conditions and service requirements, the system achieves better adaptability without requiring completely new processing architectures.
3Ease of operation
If conventional CDD precoding is used without grouping, then the ease of operation is maintained, but the signal quality and spectrum utilization rate deteriorate for high-speed users
Solution Approach 1:
The invention applies local quality by tailoring the precoding code word and cyclic delay to match the specific channel characteristics of each user group. Different groups receive different precoding configurations that are locally optimized for their particular channel conditions, service requirements, and mobility patterns, thereby improving overall system adaptability.
Solution Approach 2:
The invention introduces dynamics by making the precoding configuration dependent on user mobility characteristics and channel conditions. High-speed users receive different precoding parameters compared to low-speed users, allowing the system to dynamically adapt to changing channel conditions and maintain signal quality for mobile users.
Data Source
AI summary
A method of data processing includes the steps of: dividing user terminals into groups based on channel attributes and service requirements of the user terminals and setting a precoding code word and a cyclic delay for each of the groups; and determining which group a user terminal corresponding to the data to be processed belongs to and processing the data to be processed by the Cyclic Delay Diversity (CDD) precoding based on the precoding code word and the cyclic delay of the group. A data processing apparatus includes a grouping module and a CDD preceding module. By the method and apparatus above, the signal quality in the MIMO system can be improved.