低轨道卫星移动通信系统
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星段提供包括海洋和极地在内的全球覆盖,是地面网在某些地区的延伸,同时可用于缓解地面网的通信拥塞,使得无需增加地面网的无线频谱即能支持更多的用户和更大的通信量。市场的巨大需求、卫星通信的实时性、终端的小型化等要求促成了中、低轨道(MEO:Median Earth Orbit;LEO:Low Earth Orbit)卫星移动通信的发展。MEO/LEO卫星移动通信的特点是中、低轨道卫星快速围绕地球旋转,即使终端没有移动,它与卫星间的通信链路也在不停地改变,用户和卫星的双重移动性与卫星用户呼叫业务的多样性,以及移动终端运动模式的变化,使得卫星移动通信系统中的信道分配与切换控制变得更为复杂,并且有其独特之处,如卫星在规定轨道上运行,终端与卫星间通信链路的改变具有可预测性、规律性和周期性等特征。由于卫星移动通信系统所具有的独特优势,人们对它能够提供的业务也提出了多种要求,包括通过卫星终端进行话音、多媒体业务、可视电话等通信,Internet业务,如E-mail、WWW浏览、电子商务等在移动网上的应用也更为普遍。信息、教育类业务具有很好的应用前景。这些业务对无线基础设施的要求有:可靠的无线网络保证用户可以在任意时刻、任意地点使用所需的Leabharlann Baidu务;支持多播;具有位置管理能力;在多个异构网中具有漫游能力;安全性要求:鉴权和通信保密;自动协商能力;业务质量要求,如时延、丢信率等;
通过对低轨道卫星无线通信信道的基本特点的研究,文章具体从无线信道的缺点进行分析,并进行了matlab仿真模拟,得出信号经过多径信道的幅频特性,多径信道对不同频率信号的衰减情况不同,即具有频率选择性,以及信号经过多径信道的衰减情况,以及码元间隔对传输信号的影响,信号的码元间隔必须远大于信号的时延差,才能尽量的减小码间干扰。
KEY WORDS: LEO satellite,Channel,Channel characteristics
第1章绪论
1.1课题研究背景
卫星移动通信系统扩大了陆地移动通信系统地理覆盖和业务覆盖的范围,可以为空中、海面和复杂地理结构的地面区域的各类移动终端提供服务,特别适用于航海、航空、低业务量地区、地面网覆盖有限的应用环境。在军民两用、平战结合、应急通信等方面具有不可替代的作用和重要意义。例如,为了保证覆盖用户可能的各种操作环境,全球化个人通信网采用层次型的多重蜂窝结构,其中卫
Through the low orbit satellite studies the basic characteristics of wireless channel, the article specifically from wireless channel faults is analyzed, and the matlab simulation, it is concluded that the signal after a multipath channel amplitude frequency characteristics, multipath channel attenuation is different on different frequency signal, which has the frequency selectivity, as well as the attenuation of the signal through the multipath channel, and the influence of element spacing to transmission signal, the signal of the symbol interval must be greater than the signal delay is poor, can try to reduce intersymbol interference.
摘要
作为一种国家关键的基础通信设施,以及全球移动通信的有机组成部分,卫
星移动通信系统在国家安全、紧急救援、互联网、远程教学、卫星电视广播以及个人移动通信等方面得到了广泛的应用。新一代宽带卫星通信系统可以提供个人电信业务、多信道广播、互联网的远程传送,是全球无缝个人通信、互联网空中高速通道的必要手段。近年来卫星通信新技术不断发展,特别是低轨道卫星移动通信系统受到了人们的广泛关注,其研究与应用已成为各国的战略发展重点。无线资源管理是低轨卫星移动通信系统研究中的一项重要内容,这主要是由于卫星系统的资源是非常昂贵的,因此如何合理而有效地管理并利用卫星系统的资源已成为关键。
关键词:低轨卫星通信,信道,信道特性
Abstract
As a national key infrastructure communication, as well as an organic part of the global mobile communications, Star mobile communication system in national security,emergency rescue, Internet, satellite TV broadcasting, remote teaching and personal mobile communication has been widely used in such aspects. A new generation of broadband satellite communication system can provide personal telecommunication business, multicasting, remote transmission, the Internet is a global seamless personal communications, high-speed Internet air passage means necessary. Satellite communication technology development in recent years, especially in low orbit satellite mobile communication system has received the widespread attention, its research and application has become a national strategic priorities. Wireless resource management is the study of Leo satellite mobile communication system is an important content, this is mainly due to the satellite system resources is very expensive, therefore how to reasonable and effective management and use of the resources of satellite system has become a key.
通过对低轨道卫星无线通信信道的基本特点的研究,文章具体从无线信道的缺点进行分析,并进行了matlab仿真模拟,得出信号经过多径信道的幅频特性,多径信道对不同频率信号的衰减情况不同,即具有频率选择性,以及信号经过多径信道的衰减情况,以及码元间隔对传输信号的影响,信号的码元间隔必须远大于信号的时延差,才能尽量的减小码间干扰。
KEY WORDS: LEO satellite,Channel,Channel characteristics
第1章绪论
1.1课题研究背景
卫星移动通信系统扩大了陆地移动通信系统地理覆盖和业务覆盖的范围,可以为空中、海面和复杂地理结构的地面区域的各类移动终端提供服务,特别适用于航海、航空、低业务量地区、地面网覆盖有限的应用环境。在军民两用、平战结合、应急通信等方面具有不可替代的作用和重要意义。例如,为了保证覆盖用户可能的各种操作环境,全球化个人通信网采用层次型的多重蜂窝结构,其中卫
Through the low orbit satellite studies the basic characteristics of wireless channel, the article specifically from wireless channel faults is analyzed, and the matlab simulation, it is concluded that the signal after a multipath channel amplitude frequency characteristics, multipath channel attenuation is different on different frequency signal, which has the frequency selectivity, as well as the attenuation of the signal through the multipath channel, and the influence of element spacing to transmission signal, the signal of the symbol interval must be greater than the signal delay is poor, can try to reduce intersymbol interference.
摘要
作为一种国家关键的基础通信设施,以及全球移动通信的有机组成部分,卫
星移动通信系统在国家安全、紧急救援、互联网、远程教学、卫星电视广播以及个人移动通信等方面得到了广泛的应用。新一代宽带卫星通信系统可以提供个人电信业务、多信道广播、互联网的远程传送,是全球无缝个人通信、互联网空中高速通道的必要手段。近年来卫星通信新技术不断发展,特别是低轨道卫星移动通信系统受到了人们的广泛关注,其研究与应用已成为各国的战略发展重点。无线资源管理是低轨卫星移动通信系统研究中的一项重要内容,这主要是由于卫星系统的资源是非常昂贵的,因此如何合理而有效地管理并利用卫星系统的资源已成为关键。
关键词:低轨卫星通信,信道,信道特性
Abstract
As a national key infrastructure communication, as well as an organic part of the global mobile communications, Star mobile communication system in national security,emergency rescue, Internet, satellite TV broadcasting, remote teaching and personal mobile communication has been widely used in such aspects. A new generation of broadband satellite communication system can provide personal telecommunication business, multicasting, remote transmission, the Internet is a global seamless personal communications, high-speed Internet air passage means necessary. Satellite communication technology development in recent years, especially in low orbit satellite mobile communication system has received the widespread attention, its research and application has become a national strategic priorities. Wireless resource management is the study of Leo satellite mobile communication system is an important content, this is mainly due to the satellite system resources is very expensive, therefore how to reasonable and effective management and use of the resources of satellite system has become a key.