User-Specific Extra-LTF Signaling for Accurate Channel Estimation
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Solution Overview
Problem
Existing radio communication technologies face challenges in improving channel estimation accuracy, particularly in scenarios with varying modulation and coding schemes among multiple users, leading to increased signal errors.
Innovation Solution
Incorporating an extra reference signal (extra-LTF) in the control signal for each destination apparatus, allowing for improved channel estimation accuracy by determining extra-LTF assignment based on required accuracy and performing maximal ratio combining of channel estimates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional channel estimation methods are used in multi-user radio communication, then device complexity is reduced, but channel estimation accuracy deteriorates due to varying modulation and coding schemes among users
Solution Approach 1:
The patent segments the control signal into user-specific portions, where each user receives a customized control signal containing appropriate reference signals (LTFs) matched to their specific modulation and coding scheme. This segmentation allows each user to have optimized channel estimation without requiring the entire system to use the most complex configuration, thus improving channel estimation accuracy while controlling overall device complexity.
2Measurement precision
If extra reference signals are added to improve channel estimation accuracy, then measurement precision improves, but loss of information increases due to additional signaling overhead
Solution Approach 1:
The patent applies local quality by adding extra reference signals (LTFs) selectively only to users who require improved channel estimation accuracy based on their specific modulation and coding scheme requirements. Users with simpler schemes do not receive additional LTFs, thus avoiding unnecessary signaling overhead. This localized enhancement improves channel estimation accuracy where needed while minimizing information loss through selective application.
3Measurement precision
If uniform reference signal allocation is used for all users, then device complexity is reduced, but measurement precision deteriorates because different users have different channel conditions and modulation schemes
Solution Approach 1:
The patent implements dynamic reference signal allocation where the number and type of LTFs assigned to each user are adjusted based on their specific modulation and coding scheme, channel conditions, and performance requirements. This dynamic allocation allows the system to optimize channel estimation accuracy for each user individually while adapting to varying communication conditions, rather than using a static uniform allocation approach.
Data Source
AI summary
The present invention improves channel estimation accuracy in wireless communication. This communication device comprises: a control circuit that sets, to a control signal, information relating to an additional reference signal for each destination device; and a transmission circuit that transmits the control signal.