一种过载系统下的非正交多用户检测方法

为了提高系统容量、频谱效率和传输速率,可以允许接收端的天线数小于发送端的天线数,即所谓的系统过载情况.而业界提出的针对第五代通信网络的功率域非正交多址接入(PDNOMA,Power Domain Non-Orthogonal Multiple Access)方式,通过功率域叠加复用可以增加用户接入数量.该研究结合系统过载和用户非正交叠加复用,介绍了过载的非正交多用户系统的基本原理,并在接收端提出一种多用户检测方法,基于迭代干扰消除的串行干扰消除算法(IICSIC,Iterative Interference Cancellation based Successive Interference Cancellation).仿真表明:与PDNOMA系统的串行干扰消除(SIC,Successive Interference Cancellation)算法和过载系统的迭代干扰消除(IIC,Iterative Interference Cancellation)方法相比较,所提的方法性能明显较好.

A Non-Orthogonal Multiuser Detection Method for Overloaded Systems

In order to improve the system capacity, spectrum efficiency and transmission rate, the number of antennas at the receiver end can be smaller than that at the transmitter end, which is called "overloaded system". The power domain non-orthogonal multiple access (PDNOMA) proposed for the fifth generation communication network can increase the number of user access by power domain multiplexing. Taking into consideration the overloaded system and the PDNOMA, this paper introduces the basic principles of an overloaded PDNOMA and proposes an iterative interference cancellation based the successive interference cancellation (IICSIC) method for multiuser detection. A simulation experiment has shown that compared with SIC (successive interference cancellation) or IIC (iterative interference cancellation) of the overloaded system, the proposed scheme performs better.