Precoding Codebook Subdivision for Pilot Overhead Reduction
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Solution Overview
Problem
In next-generation cellular communications, the increasing number of antennas on network devices leads to high pilot signal overheads during channel measurement, reducing communication efficiency and system throughput.
Innovation Solution
A precoding information obtaining method that divides a precoding codebook into multiple sub-codebooks, reducing the number of pilot signals sent by the network device in each resource block group, thereby minimizing pilot overheads and optimizing the communication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas on the network device is increased to improve system throughput, then the communication capacity is improved, but the pilot signal overhead increases and communication efficiency is reduced
Solution Approach 1:
The precoding codebook is divided into multiple sub-codebooks, each corresponding to a specific antenna port range. This segmentation allows the terminal to perform channel measurement and feedback for only one sub-codebook at a time, significantly reducing the number of pilot signals required compared to measuring the entire codebook, thus resolving the contradiction between system throughput improvement and pilot overhead reduction
2Measurement precision
If the number of pilots sent by the network device in each resource block is increased to improve channel measurement accuracy, then the communication quality is improved, but the pilot signal overhead increases and communication efficiency is reduced
Solution Approach 1:
The patent extracts only the necessary portion of the codebook for measurement by dividing it into sub-codebooks. The terminal performs channel measurement on a reduced set of precoding vectors corresponding to one sub-codebook, thereby maintaining adequate channel measurement accuracy while significantly reducing the quantity of pilot signals required
Data Source
AI summary
Embodiments of the present invention provide a precoding information obtaining method and a device. The method includes: separately precoding, by a network device by using N sub-codebooks, a pilot group including K pilots to obtain N precoded pilot groups, where the sub-codebooks are subsets of a precoding codebook, the precoding codebook includes M precoding vectors, each sub-codebook includes K precoding vectors; sending, by the network device, a precoded pilot group to a terminal device in each of W RB groups; and receiving, by the network device, precoding information fed back by the terminal device for any one of W precoded pilot groups. According to the precoding information obtaining method and the device, a quantity of pilot signals sent by the network device in each RB group is reduced, and pilot overheads in each RB group are reduced.