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5G新空口及未来系统中CSI反馈码本综述

A review of codebooks for CSI feedback in 5G new radio and beyond

Ziao Qin, Haifan Yin

AI总结:

本文综述了5G NR标准中CSI反馈码本的发展历程、各类码本的设计动因与反馈机制等,指出未来演进的待解挑战,为研究者从标准与产业视角理解CSI反馈方案提供参考。

摘要:

自2009年长期演进(Long-Term Evolution,LTE)首个版本发布以来,码本一直是无线通信标准不可或缺的组成部分。它们为多天线系统获取信道状态信息(channel state information,CSI)提供了高效途径。如今,码本不再局限于一组预定义的预编码器,而是指代一种日趋复杂的CSI反馈框架。本文对5G新空口(New Radio,NR)标准中的码本进行了综述,梳理了码本的发展时间线与演进趋势,详细阐述了每类码本的设计动因、对应的反馈机制以及预编码矩阵指示符的格式,并给出了若干见解以帮助理解这些码本的底层设计逻辑与直观思路。最后,本文指出了码本在标准未来演进中仍待解决的若干挑战。总体而言,本文对5G NR中的码本进行了全面综述,旨在帮助研究者从标准与产业视角理解CSI反馈方案。

英文摘要:

Codebooks have been indispensable for wireless communication standard since the first release of the Long-Term Evolution in 2009. They offer an efficient way to acquire the channel state information (CSI) for multiple antenna systems. Nowadays, a codebook is not limited to a set of pre-defined precoders, it refers to a CSI feedback framework, which is more and more sophisticated. In this paper, we review the codebooks in 5G New Radio (NR) standards. The codebook timeline and the evolution trend are shown. Each codebook is elaborated with its motivation, the corresponding feedback mechanism, and the format of the precoding matrix indicator. Some insights are given to help grasp the underlying reasons and intuitions of these codebooks. Finally, we point out some unresolved challenges of the codebooks for future evolution of the standards. In general, this paper provides a comprehensive review of the codebooks in 5G NR and aims to help researchers understand the CSI feedback schemes from a standard and industrial perspective.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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