基于广义近似消息传递的扰码多址卫星接收技术

Generalized approximate message passing based SrCMA satellite receiver

为了解决卫星互联网中各类终端设备对传输速率和频谱资源的需求剧增问题,针对非正交多址卫星互联网,设计了一种基于广义近似消息传递的优化卫星接收机。考虑非正交多址中的多用户检测,基于图模型建立因子图,利用因子图建立系统的消息传递模型并提出消息传递算法。基于广义近似消息传递算法,进一步降低传统基于消息传递的多用户检测器的复杂度。在卫星环境下,研究广义近似消息传递信号接收性能。仿真结果表明,所提算法能有效地解决星地之间的多用户信号共存问题,同时降低算法的运算复杂度。

In order to satisfy the requirements of the transmission rate and spectrum resource for various terminals and equipment in the satellite internet,a generalized approximation-based message passing optimization satellite receiver was designed.Considering the multi-user detection in the satellite network using the non-orthogonal multiple access,a factor graph was established based on the graph model,and the factor graph was used to analyze the message passing model of the system and a message passing algorithm was proposed.Based on the generalized approximate message passing method,the complexity of the traditional multi-user detector based on message passing was further reduced.Under satellite channel condition,generalized approximate messaging satellite receivers were studied.The simulation results show that the proposed algorithm can effectively solve the signal coexistence problem of multi-users,and reduce the computational complexity of the algorithm.