China Satellite Communications Group Corporation (China Satcom) is a state-owned large-sized key enterprise formally established on Dec. 19, 2001 according to the general deployment of the State Council on telecommuni...China Satellite Communications Group Corporation (China Satcom) is a state-owned large-sized key enterprise formally established on Dec. 19, 2001 according to the general deployment of the State Council on telecommunication system reform. Relying on its complete service system, China Satcom provides various users with specialized and high quality information communication service.展开更多
For digital channelized frequency division multiple access based satellite communication(SATCOM) systems,it is a challenging but critical issue to improve the transponder power and spectrum efficiency simultaneously u...For digital channelized frequency division multiple access based satellite communication(SATCOM) systems,it is a challenging but critical issue to improve the transponder power and spectrum efficiency simultaneously under limited and non-linear high-power amplifier conditions.In this paper,different from the traditional link supportability designs aiming at minimizing the total transponder output power,a maximal sum Shannon capacity optimization objective is firstly raised subject to link supportability constraints.Furthermore,an efficient multilevel optimization(MO) algorithm is proposed to solve the considered optimization problem in the case of single link for each terminal.Moreover,in the case of multiple links for one terminal,an improved MO algorithm involving Golden section and discrete gradient searching procedures is proposed to optimize power allocation over all links.Finally,several numerical results are provided to demonstrate the effectiveness of our proposals.Comparison results show that,by the MO algorithm,not only all links' supportability can be guaranteed but also a larger sum capacity can be achieved with lower complexity.展开更多
根据车载卫星通信终端天线低剖面、多轨道、多模式应用需求,研制了一款Ka频段双波束平板卫通相控阵天线。该天线采用板级集成天线(Antenna on Board,AOB)平板有源相控阵架构以及可扩展的有源天线子阵拼接技术,实现了接收6144阵元、发射...根据车载卫星通信终端天线低剖面、多轨道、多模式应用需求,研制了一款Ka频段双波束平板卫通相控阵天线。该天线采用板级集成天线(Antenna on Board,AOB)平板有源相控阵架构以及可扩展的有源天线子阵拼接技术,实现了接收6144阵元、发射512阵元的双波束相控阵天线高密度集成设计。经加工实测,天线两个波束扫描范围均可达±60°,发射天线等效全向辐射功率大于等于44.33 dBW,接收天线增益与噪声温度比大于等于12.33 dB/K。该天线具有集成度高、剖面低、成本低、生产效率高的特点,为毫米波频段平板架构的多波束有源相控阵天线的工程研制提供了一种可行的参考。展开更多
文摘China Satellite Communications Group Corporation (China Satcom) is a state-owned large-sized key enterprise formally established on Dec. 19, 2001 according to the general deployment of the State Council on telecommunication system reform. Relying on its complete service system, China Satcom provides various users with specialized and high quality information communication service.
基金supportedin part by Natural Science Foundation under grant No.91338108,91438206Co-innovation Laboratory of Aerospace Broadband Network Technology
文摘For digital channelized frequency division multiple access based satellite communication(SATCOM) systems,it is a challenging but critical issue to improve the transponder power and spectrum efficiency simultaneously under limited and non-linear high-power amplifier conditions.In this paper,different from the traditional link supportability designs aiming at minimizing the total transponder output power,a maximal sum Shannon capacity optimization objective is firstly raised subject to link supportability constraints.Furthermore,an efficient multilevel optimization(MO) algorithm is proposed to solve the considered optimization problem in the case of single link for each terminal.Moreover,in the case of multiple links for one terminal,an improved MO algorithm involving Golden section and discrete gradient searching procedures is proposed to optimize power allocation over all links.Finally,several numerical results are provided to demonstrate the effectiveness of our proposals.Comparison results show that,by the MO algorithm,not only all links' supportability can be guaranteed but also a larger sum capacity can be achieved with lower complexity.
文摘根据车载卫星通信终端天线低剖面、多轨道、多模式应用需求,研制了一款Ka频段双波束平板卫通相控阵天线。该天线采用板级集成天线(Antenna on Board,AOB)平板有源相控阵架构以及可扩展的有源天线子阵拼接技术,实现了接收6144阵元、发射512阵元的双波束相控阵天线高密度集成设计。经加工实测,天线两个波束扫描范围均可达±60°,发射天线等效全向辐射功率大于等于44.33 dBW,接收天线增益与噪声温度比大于等于12.33 dB/K。该天线具有集成度高、剖面低、成本低、生产效率高的特点,为毫米波频段平板架构的多波束有源相控阵天线的工程研制提供了一种可行的参考。
