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

发布时间：2018-03-11 07:53

  本文选题：正交频分复用　切入点：矢量正交频分复用　出处：《通信学报》2017年09期 　论文类型：期刊论文

【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]:In order to solve the problem of poor performance and relatively low spectral efficiency in multi-rate multi-carrier spread spectrum multiple access system, the matrix permutation principle and the decomposition property of r-cyclic channel matrix are used. An adaptive multi-rate DFT scrambling vector multicarrier code division multiple access (MAC) AMR-DFT-VMC-CDMA system model is proposed. On the basis of theoretical analysis, the relationship between the BER and the frame length of the transmitted signal is considered. An adaptive parameter adjustment algorithm is proposed to ensure long transmission frame length. The simulation results show that the proposed system has better performance than the traditional multi-rate multi-carrier spread spectrum system in fading channel. It not only meets the requirements of frame length under certain channel utilization, but also ensures the improvement of spectrum efficiency and the flexibility of multi-rate and multi-user information transmission.
【作者单位】： 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;
【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)~~
【分类号】：TN929.5
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本文编号：1597257