基于可重构智能表面的信息调制与空分多址

Information Modulation and Space Division Multiple Access Based on Reconfigurable Intelligent Surface

为了减小当前大规模天线系统中高射频成本和高功耗带来的发展限制,将可重构智能表面(Reconfigurable Intelligent Surface,RIS)技术引入新型发射机设计中,提出了一种基于可重构智能表面的信息调制与空分多址方案。通过控制RIS反射系数实现信息的调制,同时形成指向多个用户包含不同信息的空间波束,实现多用户空分多址,具有低硬件复杂度、低成本、低功耗、易集成等优点。以双用户双流发送为例,基于二进制粒子群算法给出了方案的具体实现,并进行了仿真评估。仿真结果表明,该方案能完成面向双用户的双流信号同时同频的2幅移键控(Amplitude Shift Keying,ASK)调制,并通过空分多址发送给两个用户。

To solve the problem of high radio frequency cost and power consumption in current large-scale antenna systems,the research on reconfigurable intelligent surface(RIS)technology is introduced in new transmitter designing.An RIS-based information modulation and space division multiple access scheme is proposed,which has low hardware complexity,low cost,power efficiency and easy integration.Information is modulated by controlling RIS reflection coefficients,and multi-beam containing different information for multi-users,is formed simultaneously,which realizes space division multiple access for multi-user.Taking dual-stream transmission for dual-user as an example,the implementation of the scheme is given based on binary particle swarm optimization algorithm,and relevant simulation evaluation is carried out.The simulation results show that the proposed scheme can complete the 2 amplitude shift keying(ASK)modulation of dual-current signal at the same frequency for dual users,and send it to the users through space division multiple access.