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基于短期信道信息反馈的密集小小区码本设计 预览

Codebook Design of Dense Small Cell Based on Short-term Channel Information Feedback
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摘要 传统码本方案以Rayleigh衰落信道为模型设计码本,会损失密集小小区信道中由直视径(LOS)分量带来的增益,且传统最优码字反馈开销较大。为此,提出一种基于短期信道信息反馈的密集小小区码本设计方法。利用小小区中由LOS分量带来的增益,采用奇异值分解方法将低秩码本扩展至高阶密集小小区码本。给出基于短期信道信息的密集小小区码字反馈方法,将反馈过程分为长期信道码字反馈和短期信道码字反馈,以节省反馈开销。仿真结果表明,该方法能有效提高系统容量,降低反馈开销。 The traditional codebook scheme uses Rayleigh fading channel as the model to design codebook,which will lose the gain of Line of Sight(LOS)component in dense small cell channel,and the traditional optimal codeword feedback overhead is large.To solve this problem,a design method of dense small cell codebook based on short-term channel information feedback is proposed.Using the gain of LOS component in small cell,Singular Value Decomposition(SVD)method is used to extend low rank codebook to high order dense small cell codebook.At the same time,a dense small cell codeword feedback method based on short-term channel information is presented.The feedback process is divided into long-term channel codeword feedback and short-term channel codeword feedback to save feedback overhead.Simulation results show that the proposed method can effectively improve the system capacity and reduce the feedback overhead.
作者 施振宇 李林森 SHI Zhenyu;LI Linsen(School of Information Security,Shanghai Jiaotong University,Shanghai 200240,China)
出处 《计算机工程》 CAS CSCD 北大核心 2019年第3期113-116,124共5页 Computer Engineering
关键词 小小区 直视径 短期信道信息 码本 有限反馈 small cell Line of Sight(LOS) short-term channel information codebook limited feedback
作者简介 施振宇(1986—),男,硕士研究生,主研方向为通信工程,E-mail:35828773@qq.com;李林森,副教授、博士后。
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