面向卫星通信的混合多址通信接收方案研究

Research on Hybrid Multiple Access Communication Reception Program

卫星通信场景中,随着卫星通信的发展,频谱资源日益紧缺,利用率过低。卫星信道的开放性且过长的卫星链路使得卫星传输隐蔽性差,难以保证信号的安全传输。为了应对频谱资源紧张与安全传输的需求,借鉴非正交多址(Non Orthogonal Multiple Access,NOMA)的思想,叠加传输扩频信号与非扩频信号,在接收端设计分离方案,并设计循环迭代消除流程。仿真表明,所提方案可以保证信息的安全传输,且分离后的误码率损失可以通过循环迭代改善,符合实际应用。

In the context of satellite communication scenarios,as satellite communication continues to evolve,spectrum resources are becoming increasingly scarce,resulting in low utilization rates.The openness and the excessively long satellite links lead to poor concealment of satellite transmissions,thus making it difficult to ensure the security of signal transmission.To meet the requirement of spectrum resource constraints and secure signal transmission,this paper draws inspiration from the concept of NOMA(NonOrthogonal Multiple Access),by overlaying spread spectrum signals with non-spread spectrum signals,and designing separation programs at the receiving end and a cyclic iterative cancellation process.Simulation results demonstrate that the proposed program can ensure the secure transmission of information and the bit error rate loss after separation can be improved through cyclic iteration,which is in line with practical applications.