卫星通信网络信道传输性能优化策略研究

摘要

针对传统卫星通信系统有吞吐量低,误码率高的问题,如何采用动态适应于信道条件的传输方式是提高卫星通信系统性能的关键.针对单一的物理层网络编码不能适应不断变化的信道条件的问题,在数据传输高效性和可靠性要求下,提出了在卫星通信系统中应用自适应物理层网络编码策略,并对AF-PNC、DF-PNC和DNF-PNC在不同调制方式下的传输性能进行了仿真比较.仿真表明上述策略较单一的物理层网络编码方式有着更好的信道适应性和更低的误码率.%In order to meet the requirements of the transmission efficiency and reliability,an adaptive physical network coding strategy-Adaptive PNC was proposed.This changed the situation which the single physical network coding can not adapt to the changing channel conditions.The performances of AF-PNC,DF-PNC and DNF-PNC in the Satellite PNC System were investigated with simulations.The simulation shows that adaptive PNC proposed in this paper has better channel adaptability and lower BER than the single PNC method.