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

作　　者：周杲 范平志[1] 郝莉[1] ZHOU Gao;FAN Ping-zhi;HAO Li(Sichuan Provincial Key Lab of Information Coding & Transmission School of Information Science and Technology,Southwest Jiaotong University, Chengdu 610031, China)

机构地区：[1]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

出　　处：《通信学报》2017年第9期46-54,共9页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61032002;No.60872014);高校学科创新引智计划("111"计划)基金资助项目(No.111-2-14)~~

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。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.

关 键 词：正交频分复用 矢量正交频分复用 多载波直接序列码分多址 多载波码分多址 

分 类 号：TN[电子电信]