Eight-Antenna Codebook Generation via Rotation Matrix
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Solution Overview
Problem
Existing codebooks for eight-antenna systems in LTE-A do not effectively adapt to dual-polarization channels, leading to inefficiencies in data transmission across various correlation scenarios.
Innovation Solution
A method for generating a codebook that includes obtaining a rotation matrix and rank-4 codewords for four-antenna systems, then using these to create rank-8 codewords for eight-antenna systems, which can adapt to dual-polarization and single-polarization channels by multiplying inverse matrices and using extended codewords.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a codebook for eight-antenna is designed by using Kronecker product of codebooks for two-antenna and four-antenna, then a full rank codebook can be generated, but the codebook does not adapt to characteristics of dual-polarization channel
Solution Approach 1:
The patent changes the structural parameters of the codebook by introducing a rotation matrix R8 that operates on the eight-antenna signal space. This rotation matrix is designed to account for the correlation characteristics between dual-polarization antennas, transforming the standard Kronecker product codebook into a version that adapts to dual-polarization channel conditions while maintaining full rank properties
2Ease of manufacture
If existing codebook design methods are used for eight-antenna systems, then codebook generation is simplified, but computational complexity increases and performance degrades in dual-polarization scenarios
Solution Approach 1:
The patent segments the eight-antenna codebook design into two parts: first generating a base codebook using the Kronecker product of two-antenna and four-antenna codebooks, then applying a rotation matrix R8 to transform this base codebook. This segmentation allows the design to maintain simplicity in codebook generation while improving performance through the additional rotation transformation that accounts for dual-polarization characteristics
Data Source
AI summary
A method for generating a codebook and a method and an apparatus for data transmission are provided. The method includes: receiving a label of a codeword sent by a User Equipment (UE); selecting the codeword identified by the label from the codebook for eight-antenna; and coding data to be sent by using the codeword. The codebook for eight-antenna includes at least one rank-8 codeword for eight-antenna. The rank-8 codeword for eight-antenna is generated by multiplying an inverse matrix of a rotation matrix for eight-antenna with an eight-dimensional matrix formed by rank-4 codewords for four-antenna; or generated by extending rank-4 codewords for eight-antenna, where the rank-4 codeword for eight-antenna is generated according to codewords for four-antenna. Therefore, the codeword in the codebook for eight-antenna is applicable to scenarios including dual-polarization strong correlation, dual-polarization weak correlation, single-polarization strong correlation, and single-polarization weak correlation, etc.