新型机会式NOMA协作多播方案

Novel opportunistic cooperative multicast scheme for NOMA

将认知无线电技术应用于非正交多址接入(NOMA)协作多播系统,研究了将用户作为中继的可行性,提出了一种带参数的多播候选集的二级协作传输方案。该方案先由基数q选出候选集,再根据主用户和候选次用户之间的信道增益选出最佳的转发节点。仿真结果表明,通过合理选择构造参数q,所提方案在减少次用户分集增益损失的同时,能够大幅提高主用户的分集增益。在N个多播用户组成的NOMA协作多播场景中,将主用户的分集增益从2提升到min(N-q+2, q+1),满足主用户可靠性的要求。

The cognitive radio technology was applied to non-orthogonal multiple access(NOMA)cooperative multicast system,the feasibility of using users as relays was studied,and a two-level cooperative transmission scheme with parameterized multicast candidate sets was proposed.Specifically,the scheme first selected the candidate set according to the cardinality q,and then selected the best forwarding node based on the channel gain between the primary users and the candidate secondary users.Simulation results show that,through the reasonable selection of the cardinality q,the proposed scheme can greatly reduce the diversity gain of the secondary users while simultaneously increasing the diversity gain of the primary users.In NOMA cooperative multicast scenario composed of N multicast users,the proposed scheme can increase the diversity gain of the primary users from 2 to min(N-q+2,q+1)to meet their reliability requirements.