基于迭代分组均衡的SC-FDMA-IDMA非正交多址接入系统  

Non-orthogonal multiple-access system SC-FDMA-IDMA with iterative block equalization

作　　者：刘德良[1,2] 黄强[3] 徐大专[2] 

机构地区：[1]中国人民解放军理工大学通信工程学院,江苏南京210007 [2]南京航空航天大学信息科学与技术学院,江苏南京210007 [3]中国电子科技集团第二十八研究所,江苏南京210007

出　　处：《通信学报》2014年第8期48-55,共8页Journal on Communications

基　　金：国家自然科学基金资助项目(61301157)~~

摘　　要：SC-FDMA-IDMA非正交多址接入结合了SC-FDMA和IDMA 2种技术,这种结合使SC-FDMA-IDMA有可能继承这2种技术各自不同的优点,例如容量大、峰平功率比(PAPR)低、多用户信号检测简单等。但由于用户信号采用SC-FDMA这种特殊的单载波调制方式进行传输,当信道的频率选择性比较严重时,系统性能将快速下降。为此推导了适应于SC-FDMA-IDMA系统的迭代分组判决反馈均衡(IB-DFE)算法,以提高系统抗频率选择性衰落的能力。仿真研究表明,采用IB-DFE均衡算法后,相对于采用高阶调制的单用户SC-FDMA系统,在相同的传输效率下采用低阶调制的多用户SC-FDMA-IDMA系统的性能有了很大的提高。As a new non-orthogonal multiple-access scheme, SC-FDMA-IDMA combines two technologies of SC-FDMA and IDMA together. This combination makes SC-FDMA-IDMA have the probability to inherit different advantages of these two technologies such as large system capacity, low peak-to-average power ratio （PAPR） and simple multiuser detection. However, because SC-FDMA for the transmission of different users＇ signal is a special form of single carrier modulation, the system performance may degrade quicldy when the frequency selectivity of channel is serious. So the iterative block decision feedback equalization （IB-DFE） algorithm applied to the SC-FDMA-IDMA system is derived in order to enhance the ability of anti：frequency selective fading. Simulation results show that comparing with the sin- gle-user SC-FDMA system with high-order modulation, the multiuser SC-FDMA-IDMA system with low-order modulation has great performance improvement after adopting the IB-DFE algorithm on condition that these two systems have the same transmission efficiency.

关 键 词：SC-FDMA-IDMA 多用户检测 迭代分组判决反馈均衡 

分 类 号：TN911[电子电信—通信与信息系统]