干扰容忍的北斗卫星通信资源灵活分配技术研究

Flexible interference⁃tolerant communication resource allocation for Beidou satellites

在考虑波束间干扰的情况下,传统通信频率资源分配方法无法对卫星通信资源进行有效利用。文中基于北斗卫星通信系统,提出了一种灵活的频率资源分配方法以响应通信状态变化。首先,根据每个波束的通信请求,在集群边界上的相邻波束之间部分地分配相同的子信道,在波束内干扰影响较小的范围内使用这些子信道。其次,对每个集群边界处相邻波束之间相同子信道组合进行优化,以最大化卫星通信系统的吞吐量。然后,对灵活性分析模型进行了扩展,将灵活性指数计算为每个评估点的吞吐量与请求速率之比的平均值,可以在系统所处环境变化的情况下对系统的灵活性进行定量评估。最后,对所提出的方法进行了性能评估。仿真结果表明,在系统周围状态变化的情况下,与传统方法相比所提出的方法将灵活性指数提高了15%,可以比传统方法更灵活地分配资源,验证了该方法的有效性。

The traditional communication frequency resource allocation method cannot effectively use satellite communication resources with the inter⁃beam interference.Targeting the Beidou satellite communication system,this paper proposes a flexible frequency resource allocation method to respond to the change of communication state.First,according to the communication request of each beam,parts of the adjacent beams on the cluster boundary share the same subchannel,and use it in the range where the interference within the beams is less affected.Second,the shared subchannel combination between the adjacent beams at the boundary of each cluster is optimized to maximize the throughput of the satellite communication system.Third,the flexibility analysis model is extended,and the flexibility index is calculated as the average ratio of the throughput to the request rate of each evaluation point.This index can quantitatively evaluate the flexibility of the system when the environment changes.Finally,the performance of the proposed method is evaluated.The simulation results show that when the state around the system changes,the proposed method increases the flexibility index by 15%compared with the traditional method,and can allocate resources more flexibly than the traditional method,which verifies the effectiveness of the method.