卫星移动通信信道模型研究及基带仿真实现
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摘要
卫星移动通信系统已经成为当前通信领域中发展非常迅速的研究方向和现代通信强有力的手段之一。在卫星移动通信系统的研究开发、工程设计中，卫星移动通信信道传播特性的研究是最重要的要素之一。
本文在对卫星移动通信信道的概率分布模型进行理论分析的基础上，给出了Lutz模型的软件仿真实现的详细过程。为了做到能够尽可能地逼近实际卫星移动通信信道的传播特性和减少信道模型在硬件防真实现时的风险，我们的工作流程是：首先立足于理论分析和软件仿真，然后将理论公式和仿真所得到的数据与实测数据进行对比，最后才应用于具体的硬件实现。
本文包含有以下的主要内容：
· 对卫星移动通信信道传播特性研究中常用的三个概率分布给出了详细的推导过程；以便对这几个在卫星移动通信信道传播特性的研究中常用的概率分布函数有更深的理解，对进一步研究卫星移动通信信道传播特性和对信道的建模提供了更为详尽的理论基础；
· 对卫星移动通信信道传播特性的研究中常用的信道模型进行了理论上的分析和讨论，并对卫星移动通信信道建模的研究工作提出了一定的看法；
· 指出了以前的文献中关于C.Loo模型和Corazza模型的等同性的证明错误；并从接收信号功率的角度出发，通过理论推导及仿真曲线拟合重新证明了在乡村环境下，这两个模型的确是具有等同性的；从而在对乡村环境下的卫星移动通信信道传播特性进行研究时，可以只采用Corazza模型来对实际的信道进行建模，这样可以避免重复的建模工作并提高研究工作的效率和准确性；
· 给出了Lutz模型在MATLAB6.0_Simulink4.0环境下的软件仿真实现的详细过程和整体仿真测试的对比结果，保证了该模型在硬件实现时的可靠性和可行性，从而可以将它们应用于指导模型的硬件仿真实现并可以降低硬件实现时的风险。
Satellite mobile communication system has become one of the hot communication research fields and a useful tool for modern communication. During the work of studying, planning and designing modern mobile communication systems which are based on satellites, the study of propagation characteristics of the satellite mobile channel is one of the most important factors.
In this dissertation, on the basis of theoretical analyses of the probabilistically distributed models of satellite mobile channels, we give the detailed processes of the software simulation of Lutz model. In order to approximate the characteristics of the real satellite mobile channels as well as possible and in order to lower risks in the hardware simulation of the models, firstly, we do the work of theoretical analyses and software simulations ; secondly we compare the data from the theoretical formula and computer simulations with the measured data; finally we apply the conclusions to the hardware simulation of Lutz model.
The main content in this dissertation includes:
·detailed processes of derivations of the there probability distributions which are often used in studying the characteristics of satellite mobile channels are given. It contributes to the deeper comprehesion of these probability distributions , affords more detailed theoretical basis for further studying and simulating satellite mobile channels,
· theoretical analyses and discussions of the models which are often used in the study of the propagating characteristics of satallite mobile channels are given; meantime, some discussions on the work of model simulations are also given,
·incorrect derivation of the equality between C.Loo model and Corazza model in some other papers is pointed out . Via the conception of received power, we derivate that in the rural environments these two models really have the equal relationship by the way of theoretical derivation and simulatant fittings. Therefore, it is able to use Corazza model in studying the characteristics of satellite mobile channels in the rural environments and able to avoid the iterant work of modeling ,in order to enhance the efficiency and accuracy of research work,· detailed processes of simulating Lutz model by using MATLAB6.0_Simulink4.0 and the results of comparisions are given. It can ensure the reliability and practicability of the hardware simulation of Lutz model . The conclusions from this dissertation can be used to direct the hardware simulations of models so as to lower risks .
本文在对卫星移动通信信道的概率分布模型进行理论分析的基础上，给出了Lutz模型的软件仿真实现的详细过程。为了做到能够尽可能地逼近实际卫星移动通信信道的传播特性和减少信道模型在硬件防真实现时的风险，我们的工作流程是：首先立足于理论分析和软件仿真，然后将理论公式和仿真所得到的数据与实测数据进行对比，最后才应用于具体的硬件实现。
本文包含有以下的主要内容：
· 对卫星移动通信信道传播特性研究中常用的三个概率分布给出了详细的推导过程；以便对这几个在卫星移动通信信道传播特性的研究中常用的概率分布函数有更深的理解，对进一步研究卫星移动通信信道传播特性和对信道的建模提供了更为详尽的理论基础；
· 对卫星移动通信信道传播特性的研究中常用的信道模型进行了理论上的分析和讨论，并对卫星移动通信信道建模的研究工作提出了一定的看法；
· 指出了以前的文献中关于C.Loo模型和Corazza模型的等同性的证明错误；并从接收信号功率的角度出发，通过理论推导及仿真曲线拟合重新证明了在乡村环境下，这两个模型的确是具有等同性的；从而在对乡村环境下的卫星移动通信信道传播特性进行研究时，可以只采用Corazza模型来对实际的信道进行建模，这样可以避免重复的建模工作并提高研究工作的效率和准确性；
· 给出了Lutz模型在MATLAB6.0_Simulink4.0环境下的软件仿真实现的详细过程和整体仿真测试的对比结果，保证了该模型在硬件实现时的可靠性和可行性，从而可以将它们应用于指导模型的硬件仿真实现并可以降低硬件实现时的风险。
Satellite mobile communication system has become one of the hot communication research fields and a useful tool for modern communication. During the work of studying, planning and designing modern mobile communication systems which are based on satellites, the study of propagation characteristics of the satellite mobile channel is one of the most important factors.
In this dissertation, on the basis of theoretical analyses of the probabilistically distributed models of satellite mobile channels, we give the detailed processes of the software simulation of Lutz model. In order to approximate the characteristics of the real satellite mobile channels as well as possible and in order to lower risks in the hardware simulation of the models, firstly, we do the work of theoretical analyses and software simulations ; secondly we compare the data from the theoretical formula and computer simulations with the measured data; finally we apply the conclusions to the hardware simulation of Lutz model.
The main content in this dissertation includes:
·detailed processes of derivations of the there probability distributions which are often used in studying the characteristics of satellite mobile channels are given. It contributes to the deeper comprehesion of these probability distributions , affords more detailed theoretical basis for further studying and simulating satellite mobile channels,
· theoretical analyses and discussions of the models which are often used in the study of the propagating characteristics of satallite mobile channels are given; meantime, some discussions on the work of model simulations are also given,
·incorrect derivation of the equality between C.Loo model and Corazza model in some other papers is pointed out . Via the conception of received power, we derivate that in the rural environments these two models really have the equal relationship by the way of theoretical derivation and simulatant fittings. Therefore, it is able to use Corazza model in studying the characteristics of satellite mobile channels in the rural environments and able to avoid the iterant work of modeling ,in order to enhance the efficiency and accuracy of research work,· detailed processes of simulating Lutz model by using MATLAB6.0_Simulink4.0 and the results of comparisions are given. It can ensure the reliability and practicability of the hardware simulation of Lutz model . The conclusions from this dissertation can be used to direct the hardware simulations of models so as to lower risks .
引文
[1] 张乃通，张中兆，李英涛等,"卫星移动通信系统（第2版）".电子工业出版社；2000,3；PP26
[2] C.Loo,"A Statistical Model for a Land Mobile Satellite Link".IEEE Trans. on VT.；1985,34(3/8)；PP122－127
[3] G.E. Corazza and F.Vatalaro,"A Statistical Model for Land Mobile Satellite Channels and Its Application to Nongeostationary Orbit Systems". IEEE Trans. on VT.；1994,43(3/8)；PP738－742
[4] E.Lutz，D.Cygan ,M.Dippold,et al,"The Land Mobile Satellite Communication Channel――Recording, Statistical, and Channel Model". IEEE Trans. on VT.；1991,40(2/5)；PP375－385
[5] http://www.mathworks.com/support
[6] 林金朝，杨士中，"阴影环境下陆地移动卫星信道的模型研究".电讯技术，2001,4；PP84－87
[7] 张更新，张杭等，"通信工程丛书－卫星移动通信系统".人民邮电出版社，2001,10；PP79－85
[8] 盛聚，谢式千，潘承毅，"概率论与数理统计（第二版）".高等教育出版社，2000,3；PP134－136
[9] E.Lutz,M.Werner and A.Jahn,"Satellite Systems for Personal and Broadband Communications".Berlin:Springer-Verlag,2000；PP353
[10] 王沫然，"Simulink 4建模及动态仿真".电子工业出版社，2002,1；PP6－8
[11] W.C.Jacke, "Microwave Mobile Communications".New York：Johe Willey & Sons Inc.,1974；PP65－68
[12] C.Loo and N.Secord, "Computer Models for Fading Channels with Applications to Digital Transmission".IEEE Trans. on VT.；1985,34(3/8)；PP700－707
[13] 李英涛，郝川，张中兆等,"卫星移动通信信道模型和误码率特性分析".通信学报；1996,6；PP22-30
[14] 赵冬梅，贺丰，陈振国,"移动卫星通信信道模型的研究".电信快报；1996,10；PP3－6
[15] 赵冬梅，贺丰，陈振国, "移动卫星通信信道的系统仿真".电信快报；1996,11；PP3-7
[16] A.G.Kanatas and P.Constantinou,"City Center High-Elevation Angle Propagation Measurements at L Band for Land Mobile Satellite Systems".IEEE Trans. on VT.；1998,47(3/8)；PP1002－1011
[17] 陈秀廷，段少华，张乃通，"三状态信道模型在卫星移动通信系统中的应用研究".哈尔滨工业大学学报；1998,2(1/30)；PP91－94
[18] 胡剑浩，李涛，吴诗其，"实时低轨卫星移动通信信道模拟器设计".电子科技大学学报；1998,8(4/27)；PP351－356
[20]郝学坤，张更新，"宽带移动卫星通信信道的研究".解放军理工大学学报；2000,12(1/6)；PP15－19
[21]高电波，陈贺新，戴逸松，"陆地移动卫星通信信道确定性仿真模型分析".长春邮电学院学报；2001,(3,4/19)；PP14－19
[22]高电波，戴逸松，"卫星移动通信信道模型研究及仿真分析".电波科学学报；2001,12(4/16)；PP508－512
[23]高电波，戴逸松，陈贺新，"陆地移动卫星通信信道的统计特性研究".通信学报；2001,12(12/22)；PP117－123
[24]郭道省，甘仲民，张邦宁等，"卫星移动通信的信道特点及仿真模型".系统仿真学报；2001,7(4/13)；PP505－507
[25]F.P.Fontán,M.Vázquez-Castro,C.E.Cabado,et al,"Statistical Modeling of the LMS Channel".IEEE Trans. on VT.；2001,50(6/10)；PP1549－1567
[26]肖琨,吴诗其，"一种适用于非城市区域的卫星移动信道统计模型".电子学报；2002,7；PP999－1002
[2] C.Loo,"A Statistical Model for a Land Mobile Satellite Link".IEEE Trans. on VT.；1985,34(3/8)；PP122－127
[3] G.E. Corazza and F.Vatalaro,"A Statistical Model for Land Mobile Satellite Channels and Its Application to Nongeostationary Orbit Systems". IEEE Trans. on VT.；1994,43(3/8)；PP738－742
[4] E.Lutz，D.Cygan ,M.Dippold,et al,"The Land Mobile Satellite Communication Channel――Recording, Statistical, and Channel Model". IEEE Trans. on VT.；1991,40(2/5)；PP375－385
[5] http://www.mathworks.com/support
[6] 林金朝，杨士中，"阴影环境下陆地移动卫星信道的模型研究".电讯技术，2001,4；PP84－87
[7] 张更新，张杭等，"通信工程丛书－卫星移动通信系统".人民邮电出版社，2001,10；PP79－85
[8] 盛聚，谢式千，潘承毅，"概率论与数理统计（第二版）".高等教育出版社，2000,3；PP134－136
[9] E.Lutz,M.Werner and A.Jahn,"Satellite Systems for Personal and Broadband Communications".Berlin:Springer-Verlag,2000；PP353
[10] 王沫然，"Simulink 4建模及动态仿真".电子工业出版社，2002,1；PP6－8
[11] W.C.Jacke, "Microwave Mobile Communications".New York：Johe Willey & Sons Inc.,1974；PP65－68
[12] C.Loo and N.Secord, "Computer Models for Fading Channels with Applications to Digital Transmission".IEEE Trans. on VT.；1985,34(3/8)；PP700－707
[13] 李英涛，郝川，张中兆等,"卫星移动通信信道模型和误码率特性分析".通信学报；1996,6；PP22-30
[14] 赵冬梅，贺丰，陈振国,"移动卫星通信信道模型的研究".电信快报；1996,10；PP3－6
[15] 赵冬梅，贺丰，陈振国, "移动卫星通信信道的系统仿真".电信快报；1996,11；PP3-7
[16] A.G.Kanatas and P.Constantinou,"City Center High-Elevation Angle Propagation Measurements at L Band for Land Mobile Satellite Systems".IEEE Trans. on VT.；1998,47(3/8)；PP1002－1011
[17] 陈秀廷，段少华，张乃通，"三状态信道模型在卫星移动通信系统中的应用研究".哈尔滨工业大学学报；1998,2(1/30)；PP91－94
[18] 胡剑浩，李涛，吴诗其，"实时低轨卫星移动通信信道模拟器设计".电子科技大学学报；1998,8(4/27)；PP351－356
[20]郝学坤，张更新，"宽带移动卫星通信信道的研究".解放军理工大学学报；2000,12(1/6)；PP15－19
[21]高电波，陈贺新，戴逸松，"陆地移动卫星通信信道确定性仿真模型分析".长春邮电学院学报；2001,(3,4/19)；PP14－19
[22]高电波，戴逸松，"卫星移动通信信道模型研究及仿真分析".电波科学学报；2001,12(4/16)；PP508－512
[23]高电波，戴逸松，陈贺新，"陆地移动卫星通信信道的统计特性研究".通信学报；2001,12(12/22)；PP117－123
[24]郭道省，甘仲民，张邦宁等，"卫星移动通信的信道特点及仿真模型".系统仿真学报；2001,7(4/13)；PP505－507
[25]F.P.Fontán,M.Vázquez-Castro,C.E.Cabado,et al,"Statistical Modeling of the LMS Channel".IEEE Trans. on VT.；2001,50(6/10)；PP1549－1567
[26]肖琨,吴诗其，"一种适用于非城市区域的卫星移动信道统计模型".电子学报；2002,7；PP999－1002