非正交多址接入中稀疏多用户检测方法

发布时间：2018-01-06 08:35

本文关键词：非正交多址接入中稀疏多用户检测方法　出处：《西安电子科技大学学报》2017年03期 　论文类型：期刊论文

【摘要】：针对未来5G上行非正交多址接入系统多用户检测中连接用户数大、一定时间内活跃用户少和信号稀疏的特点,利用压缩感知理论和5G非正交多址系统需求,设计了一种码片映射码分多址的非正交多址系统.通过压缩感知技术联合检测出上行非正交多址系统中活跃用户和数据,由于用户不再发送给基站自身活跃状态的信息,也无需提前与基站进行交互,因此大大降低了控制信令的开销和传输时延.仿真结果表明,该系统不仅能够利用压缩感知理论可靠地检测出活跃用户和数据,同时还可以实现过载,在活跃用户较为稀疏情况下,过载率可达300%,大幅提升了频谱利用率.
[Abstract]:Aiming at the characteristics of large number of connected users, less active users and sparse signal in 5G uplink non-orthogonal multiple access system in the future, the theory of compression sensing and the requirement of 5G non-orthogonal multiple access system are used. A non-orthogonal multiple access system based on chip mapping code division multiple access (CDMA) is designed. Active users and data in uplink non-orthogonal multiple access systems are detected by compression sensing technology. Since the user no longer sends the active state information to the base station and does not need to interact with the base station in advance, the overhead of the control signaling and the transmission delay are greatly reduced. The simulation results show that. The system not only can reliably detect active users and data by using compression sensing theory, but also can realize overload. In the case of sparse active users, the overload rate can reach 300%. A significant increase in spectrum efficiency.
【作者单位】：桂林电子科技大学认知无线电与信息处理教育部重点实验室;中国电子科技集团公司第54研究所通信网信息传输与分发技术重点实验室;
【基金】：国家自然科学基金资助项目(61371107,61362006) 无线宽带与信号处理重点实验室基金资助项目(GXKL061501) 北京邮电大学泛网无线通信教育部重点实验室资助项目(KFKT-2014102) 认知无线电与信息处理教育部重点实验室2015年主任基金资助项目(CRKL150111)
【分类号】：TN929.5
【正文快照】： 近年来,随着移动互联网和物联网的飞速发展,未来5G相对于4G频谱效率要求提高5~15倍,连接密度提高10陪以上,达到106/km2,传输时延从4G的50ms降低到1ms量级等.为满足这些要求,一些关键技术相继被提出,如Massive多输入多输出(Multiple-Input Multiple-Output,MIMO)、毫米波传输

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