摘要
针对现有正交多址技术不能满足5G海量连接的场景对更高容量的需求,对非正交多址接入技术进行研究。首先对非正交多址接入技术进行介绍,非正交多址接入技术多用户数据不正交,且占用相同的时频资源进行发送,在该项技术中,接收机的设计算法尤为重要。之后对干扰消除接收机进行了研究,研究了MMSE-SIC算法,但该算法在用户负载大时,时延较大。结合并行干扰消除技术的优点提出了准并行干扰消除算法,该算法相较于MMSE-SIC时延减小近50%,但性能下降较大。针对高负载场景提出改进干扰消除算法,在保证性能下降不大时,缩短了高负载情况下系统时延。
Due tomass connectionsin5G mobile communication system, orthogonal muhiple access can＇t meet the requirement of higher channel capacity,then the research on non-orthogonal multiple access is needed. Firstly, the non-orthogonal multiple access is introduced.Multi-user data are not orthogonal,and occupy the same time-frequency resource for transmission.The core of the technology is the algorithm of the receiver. This paper mainly investigates interference cancellation algorithm. The MMSE-SIC receiver has good performance,but it brings great time delay when there are many users.Then the quasi parallel interference cancellationalgorithm with lower time delay is given, but the performance is bad. Finally, an improved interference cancellation algorithm is introduced. It has a littlecapacityloss,but reduces the time delaysignificantly when the user load is high.
出处
《无线电通信技术》
2016年第5期6-9,共4页
Radio Communications Technology
基金
国家自然科学基金项目(61401120)
关键词
非正交多址接入
串行干扰消除
准并行干扰消除
MMSE
Non-Orthogonal Multiple Access system
Successive Interference Cancellation
Quasi Parallel InterferenceCancellation
MMSE
