Ka频段宽带IDMA卫星传输系统的性能分析

为了解决当前Ka频段宽带卫星接入体制难以克服的技术瓶颈,将交织区分多址接入(IDMA)技术引入宽带卫星通信系统,充分利用IDMA接入方式在低复杂度和高频谱效率等方面的优势,以期在资源受限的卫星系统中获得更高的用户容量和服务质量。结合Ka频段卫星信道特点建立了宽带IDMA卫星系统仿真模型,阐述了其系统容量计算方法及推导了相关的表达式。仿真和分析表明,与传统CDMA方式相比,宽带卫星IDMA传输机制以较低的星上处理复杂度获得通信性能和用户容量的大幅提高,为下一代多业务、高容量、高速率的宽带卫星通信系统提供了一种有价值的参考方案。

Performance Evaluation for Ka-band IDMA-based Broadband Satellite Communication System

In order to solve the technical bottlenecks in the existing Ka-band broadband satellite systems, IDMA (Interleave-Division Multiple Access) is introduced into broadband satellite communication systems in this paper to get higher capacity and service quality in limited resources by full use of low complexity and high frequency spectrum efficiency of IDMA. Meanwhile a simulation model of IDMA-based broadband satellite communication system is established, and then the expression of system capacity is derived with the combination of Ka-band satellite channels. Analysis and simulation results show that IDMA method leads to better BER performance and higher capacity than CDMA method in broadband satellite communication system, this also provides a valuable reference solution for the next generation of high capacity, more business, and high speed broadband satellite communication system.