CSI Feedback Quantization Reducing MIMO Overhead
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Solution Overview
Problem
Existing methods for quantized channel state information (CSI) feedback in MIMO systems are inefficient due to high algorithm complexity and feedback overhead, which affect transmission performance.
Innovation Solution
A new method and apparatus for CSI quantized feedback that determines the maximum value of CSI matrix elements, performs M-bit and Nb-bit quantization, and transmits the quantization amplitude and matrix, reducing complexity and overhead while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantized CSI feedback is implemented using existing methods, then transmission performance is improved, but algorithm complexity and feedback overhead increase
Solution Approach 1:
The patent segments the CSI feedback process into two independent parts: (1) quantization of the maximum amplitude value Alpha, and (2) quantization of the normalized channel matrix elements. This segmentation allows each part to be optimized separately, reducing overall complexity while maintaining feedback accuracy for transmission performance
Solution Approach 2:
The patent extracts the amplitude information (Alpha) from the channel matrix H and separates it from the normalized channel coefficients. By taking out Alpha and quantizing it independently with dedicated bits, the system achieves more efficient representation that reduces feedback overhead while preserving the quality needed for accurate channel state reconstruction at the receiver
2Reliability
If quantized CSI feedback is implemented using existing methods, then transmission performance is improved, but feedback overhead increases
Solution Approach 1:
The patent changes the parameter representation by separating the amplitude parameter Alpha from the normalized channel coefficients. By allocating a specific number of bits (NAlpha) to represent Alpha and using remaining bits for the normalized matrix elements, the system optimizes the information distribution to reduce total feedback overhead while maintaining the quality required for accurate channel state reconstruction
Data Source
AI summary
The present disclosure provides a method and apparatus for transmitting and receiving Channel State Information. The said transmitting method includes calculating the maximum value mH(k) of real part and imaginary part of each element in CSI matrix Heff(k) of the sub-carrier; carrying out M bit quantization to mH(k) to obtain the quantization amplitude MH(k); calculating the linear portion MHlin(k) of MH(k); using MHlin(k) for carrying out Nb bit quantization to real part and imaginary part of each element in Heff(k) respectively to obtain the quantized CSI matrix Heff(k); Nb being a positive integer; and transmitting said quantization amplitude MH(k) and said quantized CSI matrix Heffq(k).