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面向卫星通信与导航的下一代多址接入
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作者 侯天为 关达 孙昕 《中兴通讯技术》 北大核心 2024年第1期55-59,共5页
面向卫星通信与导航(SCAN)系统多样复杂的应用场景,下一代多址接入(NGMA)技术可以提供更高的通信速率、更多的接入数量和更广的覆盖面积。面向SCAN系统,对基于多功能NGMA、基于多资源NGMA和基于多技术NGMA展开研究,分析了现有的NGMA技术... 面向卫星通信与导航(SCAN)系统多样复杂的应用场景,下一代多址接入(NGMA)技术可以提供更高的通信速率、更多的接入数量和更广的覆盖面积。面向SCAN系统,对基于多功能NGMA、基于多资源NGMA和基于多技术NGMA展开研究,分析了现有的NGMA技术对SCAN系统的性能增益。最后,总结SCAN-NGMA面临的挑战,展望了未来发展的方向,为SCAN-NGMA架构的进一步演进提供了参考依据。 展开更多
关键词 ngma SCAN 多功能ngma 多资源ngma 多技术ngma
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Should There Be a Limit to Number Of People Allowed to Climb Mount Qomolangma?
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《Beijing Review》 2019年第23期46-47,共2页
Every summer, there is a surge of climbers seeking to make use of the precious window of good weather to summit Mount Qomolangma, the highest mountain in the world. With the number of climbers rising every year, overc... Every summer, there is a surge of climbers seeking to make use of the precious window of good weather to summit Mount Qomolangma, the highest mountain in the world. With the number of climbers rising every year, overcrowding on the top of the world has given rise to the incredible phenomen on of 'traffic jams"―ong queues of climbers from different countries and regions awaiting their turn to reach the top and then descend. The long wait in below freezing temperatures in the rarified atmosphere is tuming increasingly perilous with some climbers meeting their death due to altitude sickness, excessive oxygen depletion and exhaustion. 展开更多
关键词 LIMIT to NUMBER Of PEOPLE Allowed CLIMB MOUNT Qomola ngma
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