卫星通信系统两步随机接入技术研究

为了实现卫星通信系统低延迟高可靠接入,研究了两步随机接入技术中的信道设计及接收端检测算法.针对卫星场景提出了一种两步随机接入信道设计方案,对两步随机接入信道中数据部分的信道结构以及前导和数据之间的映射方式进行了设计.针对传统最小均方串行干扰消除(Minimum Mean Squared Error-Successive Interference Cancellation,MMSE-SIC)算法中存在误差传播问题导致解码性能降低的问题,提出了一种多判决排序串行干扰消除(Multi-decision Ordered Successive Interference Cancellation,MD-OSIC)算法,以提升多用户发起接入时数据部分检测的可靠性.仿真结果验证了所设计信道及检测算法在典型卫星通信场景下应用的可行性.

Research on two-step random access technology of satellite communication system

In order to realize low latency and high reliability access of satellite communication system,a channel design scheme and detection algorithm for two-step random access scheme are studied.A two-step random access channel design scheme is proposed for satellite communication scenario.In this scheme,the channel structure of the data part and the mapping between the preamble and the data are designed.In order to reduce the impact of error propagation in the traditional minimum mean squared error-successive interference cancellation(MMSE-SIC) algorithm,the multi-decision ordered SIC(MD-OSIC) algorithm is proposed to improve the reliability of data detection when multiple users initiate uplink random access.Simulation results validate the feasibility of the designed channel and detection algorithm in a typical satellite communication environment.