Channel State Information Feedback Using Dual Codebook Quantization
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Solution Overview
Problem
In 5G communication systems, especially in Frequency Division Duplexing (FDD) systems, the limited feedback size leads to quantization errors when acquiring channel state information, particularly in multiple-user multiple-antenna channels, resulting in deteriorated system performance due to excessive feedback overhead.
Innovation Solution
A method involving the use of multiple codebooks for channel state information quantization, specifically employing first and second quantization processes using different codebooks, and selecting the best feedback based on comparison results to reduce overhead while maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If channel state information is quantized using a single codebook with limited feedback size, then feedback overhead is reduced, but quantization errors increase and system performance deteriorates
Solution Approach 1:
The patent segments the channel state information feedback process into two distinct quantization stages: first quantization using a first codebook and second quantization using a second codebook. This segmentation allows the system to process and compress channel information in multiple passes, achieving better accuracy than single-stage quantization while maintaining controlled feedback overhead through the hierarchical structure of the two codebooks.
2Measurement precision
If multiple codebooks are used for channel state information quantization, then quantization accuracy improves, but feedback overhead and processing complexity increase
Solution Approach 1:
The patent divides the quantization process into two separate stages using different codebooks, where each stage handles specific aspects of channel state information. This segmentation allows the system to achieve higher accuracy by capturing different dimensions of channel characteristics in each quantization stage, while the modular structure manages complexity by processing information in manageable steps rather than requiring a single complex codebook.
Data Source
AI summary
The disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A feedback transmission method for a receiving device in a multiple input multiple output system according to one embodiment comprises: a step of measuring channel state information; a first quantization step of quantizing the channel state information using a first codebook; a second quantization step of quantizing the channel state information using second and third codebooks which are different from the first codebook; and a step of feeding back the channel state information on the basis of a selection result of one of the first and second quantization steps.