CSI Feedback Precoding for Higher-Throughput Wireless Links
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in maximizing data throughput through precoding methods, particularly in optimizing beamforming techniques for millimeter wave bands, where signal attenuation is significant, and existing precoders do not fully leverage channel state information feedback for enhanced performance.
Innovation Solution
A wireless communication device and method that utilizes sounding reference signals (SRS) and channel state information (CSI) feedback to generate feedback information including rank indicators (RI) and channel quality indicators (CQI), enabling the base station to design precoders that maximize channel capacity and beamforming gains, thereby improving data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If codebook-based precoding methods are used, then device complexity is reduced, but data throughput and beamforming gains are insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the wireless communication device measures the reference signal, estimates the channel, and feeds back channel state information (including RI and CQI) to the base station. This feedback enables the base station to design optimized precoders that maximize channel capacity, resolving the contradiction by allowing complex precoder design only when needed based on actual channel conditions.
Solution Approach 2:
The patent changes the parameters used for precoder design by incorporating both the measured channel state and the relationship between different precoders (first precoder from SRS-based channel and second precoder from reference signal). This parameter optimization enables higher data throughput while managing complexity through intelligent parameter selection.
2Productivity
If higher-resolution precoders are used to optimize channel capacity, then data throughput increases, but measurement and detection difficulty increases
Solution Approach 1:
The patent performs preliminary channel measurement using reference signals before data transmission. The wireless communication device measures the reference signal and estimates the channel in advance, providing accurate channel state information to the base station. This preliminary measurement action enables the use of higher-resolution precoders without increasing the difficulty of real-time detection and measurement.
3Measurement precision
If SRS-based precoding is used, then uplink channel estimation is improved, but downlink channel accuracy may be insufficient without additional feedback
Solution Approach 1:
The patent implements a feedback mechanism where the wireless communication device measures the reference signal, estimates the channel, and feeds back channel state information (including RI and CQI) to the base station. This feedback enables the base station to design optimized precoders that maximize channel capacity, resolving the contradiction by allowing complex precoder design only when needed based on actual channel conditions.
Solution Approach 2:
The patent uses the relationship between the first precoder (SRS-based) and the second precoder (reference signal-based) as an intermediary to transfer channel information. By measuring this relationship, the wireless communication device can infer downlink channel characteristics from uplink SRS measurements, reducing information loss while maintaining measurement precision.
Data Source
AI summary
A operating method of a wireless communication device includes transmitting a sounding reference signal (SRS) to a base station; receiving, from the base station, a first reference signal to which a second precoder is applied; generating feedback information including at least one of a rank indicator (RI) and a channel quality indicator (CQI), based on at least one of: (i) a relationship between the second precoder and a first precoder applied to a first physical downlink shared channel (PDSCH) by the base station based on the SRS; and (ii) a channel estimated by using the first reference signal; transmitting the generated feedback information to the base station; and receiving a second PDSCH to which at least one of the first precoder, the RI, and the CQI is applied.