【摘要】 针对大容量地球同步轨道(GEO)卫星系统目的关口站距用户远、同步耗时长、下行传输效率低等问题,提出基于多波束GEO卫星的大容量互联网接入系统。所提方案星上进行非再生式信号处理、基带程控交换、闭环同步控制、信令信息处理和信道调度管理以及下行链路采用时分复用传输方式。对于支持大量分散或移动用户接入互联网的应用,业务质量显著改善,且因信道利用率大大提高,实际运行时的用户容量、数据吞吐率也可能更大。仿真结果表明多频-准正交时分复用传输方式的性能更好,且根据我们已进行过的有关单元的现场可编程门阵列设计实现经验,所提系统现实可行。更多还原

【Abstract】 To overcome the problems of destination gateway far away from users,slow synchronization and low transmission efficiency of large geo-synchronous Earth orbit( GEO) satellite system,an Internet access system with large capacity based on multi-beam antenna GEO satellite was proposed. It employed on-board non-regenerating processing,baseband programcontrolled circuit switching,close-loop synchronization controlling,signaling processing,channel scheduling,and the time division multiplexing transmission scheme in the downlink. For a large number of distributed or mobile users to access the Internet,the proposed scheme can provide better quality of service and higher ratio of channels utilization; meanwhile,the user capacity and data throughput will become greater in practical running. The simulation results show that multi-frequency quasi-orthogonal time division multiplexing has a better performance and the scheme is feasible according to our similar field programmable gate array design experience.更多还原