Wireless CSI Feedback Compression Using Sparse MIMO Representations
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in channel state information (CSI) feedback and reference signal transmission, leading to high communication resource consumption and overhead.
Innovation Solution
Implementing methods for configuring and compressing CSI reference signals and feedback in MIMO systems, including spatial and frequency domain basis vector transformations, candidate codebook utilization, and time-domain compression to reduce the amount of information transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional CSI feedback methods are used, then channel state information can be transmitted, but communication resource consumption and overhead increase
Solution Approach 1:
The patent extracts and transmits only the essential components of CSI feedback by identifying and reporting only nonzero elements in the feedback information vector, rather than transmitting the complete CSI data set. This selective extraction reduces the feedback overhead while maintaining the critical information needed for accurate channel state representation.
Solution Approach 2:
The patent transforms the CSI feedback from traditional full-parameter transmission to a compressed representation by changing the parameter set being transmitted. Instead of sending complete channel state matrices, the system transmits reduced parameter sets including only nonzero elements and their positions, fundamentally altering what parameters are communicated.
2Loss of information
If complete CSI information is transmitted, then feedback accuracy is maintained, but information overhead increases
Solution Approach 1:
The patent applies extraction by identifying and removing redundant zero elements from the CSI feedback vector, keeping only the nonzero elements that carry meaningful channel state information. This extraction process maintains feedback completeness for essential information while eliminating unnecessary data transmission.
Solution Approach 2:
The patent uses partial action by transmitting only a subset of the complete CSI information - specifically, only the nonzero elements and their positions rather than the entire feedback vector. This partial transmission is sufficient for accurate channel state recovery while significantly reducing the quantity of information overhead.
3Loss of energy
If CSI feedback compression is applied, then resource overhead is reduced, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing the compression transformation at the transmitter side before transmission, where the system pre-identifies and marks the nonzero elements in the CSI feedback vector. This preliminary processing organizes the data in a compressed format that reduces overhead during transmission while simplifying the receiver's processing requirements.
Data Source
AI summary
This disclosure relates to channel state information reference signal configuration, precoding, and transmission, and channel state information feedback configuration, compression, and transmission in multiple-input and multiple-output (NEMO) wireless communication systems. The various embodiments provide channel state information reference signal and feedback schemes which facilitate a decrease of the amount of information that need to be transmitted and reduce communication resource overhead for channel state information configuration and feedback.