基于DFT-SV-OFDM的自适应多速率DFT加扰矢量码分多址系统研究

周杲; 范平志; 郝莉

doi:10.11959/j.issn.1000-436x.2017182

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基于DFT-SV-OFDM的自适应多速率DFT加扰矢量码分多址系统研究

学术论文 | 更新时间：2024-06-05

- 基于DFT-SV-OFDM的自适应多速率DFT加扰矢量码分多址系统研究
- DFT-SV-OFDM based adaptive multi-rate DFT scrambling vector code division multiple access
- 通信学报 2017年38卷第9期页码：46-54
- 作者机构：
  
  西南交通大学信息科学与技术学院信息编码与传输四川省重点实验室，四川成都 610031
- 作者简介：
  
  [ "周杲（1973-），女，浙江定海人，西南交通大学讲师，主要研究方向为正交频分复用、多址接入、无线通信传输技术等。" ]
  [ "范平志（1955-），男，四川广汉人，博士，西南交通大学教授、博士生导师，主要研究方向为编码理论、无线通信、高移动性通信技术等。" ]
  [ "郝莉（1971-），女，北京人，博士，西南交通大学教授、博士生导师，主要研究方向为MIMO预编码与检测、协作通信、多址接入等。" ]
- 基金信息：
  
  国家自然科学基金资助项目(61032002);国家自然科学基金资助项目(60872014);高校学科创新引智计划（“111”计划）基金资助项目(111-2-14)
- DOI：10.11959/j.issn.1000-436x.2017182
  中图分类号： TN92
- 网络出版日期：2017-09，
  
  纸质出版日期：2017-09-25
- 稿件说明：
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周杲, 范平志, 郝莉. 基于DFT-SV-OFDM的自适应多速率DFT加扰矢量码分多址系统研究[J]. 通信学报, 2017,38(9):46-54.

Gao ZHOU, Ping-zhi FAN, Li HAO. DFT-SV-OFDM based adaptive multi-rate DFT scrambling vector code division multiple access[J]. Journal on communications, 2017, 38(9): 46-54.
周杲, 范平志, 郝莉. 基于DFT-SV-OFDM的自适应多速率DFT加扰矢量码分多址系统研究[J]. 通信学报, 2017,38(9):46-54. DOI： 10.11959/j.issn.1000-436x.2017182.

Gao ZHOU, Ping-zhi FAN, Li HAO. DFT-SV-OFDM based adaptive multi-rate DFT scrambling vector code division multiple access[J]. Journal on communications, 2017, 38(9): 46-54. DOI： 10.11959/j.issn.1000-436x.2017182.

摘要

为解决多速率多载波扩频多址系统存在的信道衰落条件下性能下降以及频谱效率相对较低的问题，利用矩阵置换原理和 r 循环信道矩阵的分解特性，提出一种自适应多速率 DFT 加扰矢量多载波码分多址接入（AMR-DFT-VMC-CDMA）系统模型。在理论分析的基础上，综合考虑一定信道利用率条件下，信道误码率与发送信号帧长的相互制约关系，提出自适应参数调整算法以确保足够长的传输帧长。仿真结果表明，该系统在衰落信道下相比传统的多速率多载波扩频系统具有更好的性能，且通过调整参数，既满足了一定信道利用率下对帧长的要求，保证了频谱效率提高，又可以灵活完成多速率多用户的信息传输。

Abstract

Multipath interference would degrade the performance of multi-rate systems based on OFDM and CDMA

which spectrum efficiency was also lower relatively.To improve the performance and spectrum efficiency

a novel adaptive multi-rate DFT scrambling vector multi-carrier CDMA (AMR-DFT-VMC-CDMA) was proposed based on the theory of matrix permutation and r-cyclical matrix decomposition characteristics.Meanwhile

by theoretical analysis

the parameters of the system could be adaptively adjusted to ensure frame length long enough to break the restriction between channel bit error rate and data frame length on a certain channel utilization condition.The simulation results show that compared with the traditional multi-rate

multi-subcarrier and spreading system

the new system could achieve multi-rate and multi-user information transmission flexibly with better performance and better spectrum efficiency in fading channels.Moreover

it can satisfy the requirement of frame length under certain channel utilization by adjusting the parameters.

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Keywords

references

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