Wireless Data Redistribution for Pilot Symbol Utilization
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Solution Overview
Problem
In MU-MIMO systems, the accuracy of channel estimation degrades as data moves further from pilot symbols, leading to inefficient use of pilot symbols and increased error rates due to empty resource blocks.
Innovation Solution
A wireless communications device with an empty resource block detection section and a data redistribution section that identifies and redistributes data near pilot symbols in empty resource blocks, optimizing the use of pilot symbols and improving error rate characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is distributed to resource blocks according to channel adaptive scheduling in MU-MIMO system, then resource utilization is improved, but empty resource blocks are generated when data sizes differ, causing pilot symbol underutilization and degraded channel estimation accuracy
Solution Approach 1:
The patent applies dynamics by making the resource block allocation flexible and adaptive. Instead of static allocation, the system dynamically adjusts data distribution based on terminal data sizes and channel states. The base station performs channel adaptive scheduling that continuously adapts resource allocation to current channel conditions and data sizes, transforming the rigid resource block structure into a dynamic allocation system that eliminates empty resource blocks while maintaining high resource utilization.
Solution Approach 2:
The patent changes the parameter of resource block allocation from fixed to variable based on data size. By modifying the allocation parameters according to actual data sizes of different terminals, the system adjusts the number and position of resource blocks assigned to each terminal. This parameter change ensures that resource blocks are fully utilized without creating empty blocks, thereby maintaining pilot symbol effectiveness and channel estimation accuracy.
2Area of stationary object
If pilot symbols are inserted at constant intervals in all resource blocks, then channel estimation coverage is improved, but accuracy degrades for data far from pilot symbols and empty resource blocks waste pilot symbol resources
Solution Approach 1:
The patent applies local quality by making pilot symbol insertion density and position adaptive to local data distribution. Instead of uniform pilot insertion across all resource blocks, the system adjusts pilot symbol placement based on where data is actually located. In resource blocks with data, pilots are positioned to optimize local estimation accuracy. In empty resource blocks, pilots are either removed or repositioned to serve adjacent data regions, creating locally optimized pilot configurations that improve accuracy without sacrificing coverage.
Data Source
AI summary
A wireless communications device that transmits a multiplexed signal of a plurality of data sets of different sizes to a communications terminal includes an empty resource block detection section, which detects empty resource blocks of the data sets each of which does not use any of a predetermined number of resource blocks, from among the plurality of data sets whereto the predetermined number of resource blocks are allocated in the time direction and the frequency direction; and a data redistribution section that redistributes a part of data that is distributed in resource blocks, with respect to the data sets whereto resource including empty resource blocks are allocated, in the vicinity of pilot symbols that are disposed within the empty resource blocks. It is possible to effectively utilize the function of all the pilot symbols and improve error rate characteristics.