Description: 随着第三代移动通信（3G）时代的
来临，以手机及汽车终端为主要载具的
卫星移动电视已成为近年来全球广播电
视及通信市场新一轮发展的热点之一。-With the third generation mobile communication (3G) era of mobile phones and automotive terminals in the main vehicle for the satellite mobile TV has become in recent years, the global communications market radio and television and the development of a new round of one of the hot spots. Platform: |
Size: 269312 |
Author:陈勋 |
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Description: 设计并实现了一种将GPS 全球卫星定位系统、GSM短消息服务系统、GIS 地理信息系统相结合的车辆定位、导航、调度指
挥系统. 该系统采用GPS/ DRS 相结合的定位方式,通过GSM网实现移动车辆与监控中心的双向通信,并结合电子地图实现车
辆的定位、导航、实时监控等功能. 系统具有人机界面友好、性能稳定可靠、使用方便等特点,并具有一定的社会经济效益.-Designed and implemented to GPS global satellite positioning system, GSM Short Message Service System, GIS Geographic Information System a combination of vehicle positioning, navigation, scheduling the chain of command. The system uses GPS/DRS means the combination of positioning, through the GSM network mobile vehicle monitoring center and two-way communication, combined with the realization of electronic map of the location of vehicles, navigation, real-time monitoring functions. system with man-machine interface is friendly, stable and reliable performance, ease of use, etc., and have certain social and economic benefits. Platform: |
Size: 289792 |
Author:任宏涛 |
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Description: 软件无线电技术是用于卫星导航和第三代移动通信(3G) 数据处理和计算的最优解决方案。运用基于FPGA的So PC 嵌入式设计方法构造软件无线电系统,提高了对动态实时信号的处理能力。设计完成无线通信体系结构,以及ADC 模数转换,数字下变频,CPU 中央处理器,DSP 运算单元,PCI 桥以及数据控制等模块的详细组成。相对于目前常规系统,该系统在功耗和体积方面可节省30 以上,对高速数据流的处理和计算能力有显著提高,可以应用于Cellular/ PCS 基站,GPS 抗干扰接收机,相控阵接收机,频谱分析和3G无线通信等领域。-Software radio technology is used for satellite navigation and third-generation mobile communication (3G) data processing and computing the optimal solution. So PC using FPGA-based embedded design methods to create software-defined radio system to improve the dynamic real-time signal processing capabilities. Wireless communications architecture design is completed and the ADC analog-digital conversion, digital down conversion, CPU CPU, DSP computing unit, PCI bridge, and data control module, the detailed composition. Relative to the current conventional systems, the system can save power consumption and size are more than 30 of the high-speed data stream processing and computing power has significantly increased, can be applied to Cellular/PCS base stations, GPS anti-jamming receivers, phased array receivers, spectrum analysis, and 3G wireless communications and other fields. Platform: |
Size: 516096 |
Author:x |
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Description: Up until the end of the 20th century, there was a fairly clear division between the cellular industry and other telecommunication
industries which offered basic telephone, television, radio, computer and Internet services. Most mobile operators used
second generation (2G) digital wireless technologies to enable voice communications and limited data services, while most
wireline, cable and satellite systems provided the bulk of the other telecommunication services. In spite of its initial limitations,
cellular communications have been a tremendous success, surpassing fixed line connections worldwide in 2001, just 12
years after its market introduction. This has been especially evident in developing markets where, due to their lower
deployment costs and greater network flexibility, wireless technologies have become the primary means of communication
for millions of people, spurring the economic and social development of these markets. Platform: |
Size: 1053696 |
Author:redami |
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Description: 地面移动卫星信道仿真程序 考虑雨衰 阴影 和多径影响-Land mobile satellite communication channel simulation program to consider the shadow of rain attenuation and multipath effects Platform: |
Size: 1024 |
Author:张晓娟 |
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Description: 航天科技集团所属的重庆巴山仪器厂新推出的移动卫星通信系统，填补了在汽车、火车及船舰等移动载体上追踪同步卫星技术的一项空白。-Aerospace Science and Technology Group' s Chongqing Bashan Instrument Factory, the new mobile satellite communication system, fill in cars, trains and ships and other mobile carriers synchronous satellite technology to track a blank. Platform: |
Size: 3072 |
Author:nix |
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Description:
Additionally, the access point may connect to a costly resource (e.g., a satellite link), or an external network that is susceptible to intrusion. For such reasons and others that concern data availability and response time, MANET applications should check for the existence of the desired data inside the network before attempting to connect to the external data source. An example would be a node that is searching for data that have been requested before by other nodes and are now cached and available to the rest of the nodes. Another example is where there is a group of nodes that have data which may be of interest to other nodes and are willing to share them. These scenarios and others suggest that efficient data search techniques be developed for allowing mobile nodes to find the desired data. Thus the client will search the list of data from server side to have a communication.
Platform: |
Size: 1983488 |
Author:sathiyaraj124 |
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Description: The Multichannel Aviation Satellite Communications System (MCS SATCOM) is a worldwide mobile communications system providing continuous VOICE and DATA COMMUNICATION SERVICES to and from the Aircraft.In addition to the Airborne Avionics (referred to as an Aircraft Earth Station), the total MCS SATCOM system
consists of the Space Segment (satellite network), Ground Earth Stations (GESs) and Public as well as Private Voice and Data terrestrial telecommunication network Platform: |
Size: 431104 |
Author:firetooth |
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Description: 31.19解码器- RS code is the BCH code of multi-systerm, after a long time of development, the theory and technology of RS code has been rather mature that it can rectify burst error and random error at the same time, especially burst error. It is widely used in deep space communication, satellite communication, data transmission and saving, mobile communication, document transmission, digital audio and video transmission. Platform: |
Size: 25600 |
Author:贺文忠 |
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Description: 3GPP组织发布的卫星移动通信标准还停留在3G阶段。对卫星LTE系列标准的研究，如通信协议和流程，常使用网络仿真方式。对EPS系统、开源网络仿真工具NS一3中的LTE仿真模型LENA给出了简要介绍，重点讨论了LENA模型与真实LTE系统的差异，并针对卫星移动通信环境存在大时延、高误码、信道衰落有别于地面等特点，分析和总结了利用LENA模型进行星上LTE系统仿真需要完善之处，为研究和制定卫星I肛移动通信系统标准打下了基础。(The standard of satellite mobile communication released by 3GPP is still in the 3G stage. Research on satellite LTE series standards, such as communication protocols and flows
It often uses network simulation. The LTE simulation model LENA in the EPS system and the open source network simulation tool NS 3 is briefly introduced. The difference between the LENA model and the real LTE system is emphatically discussed. In view of the characteristics of the satellite mobile communication environment, such as large delay, high error code, and the fading of the channel are different from the ground, the LENA model is analyzed and summarized for the on-board LT. E system simulation needs improvement, which lays the foundation for studying and formulating the standard of I anal mobile communication system.) Platform: |
Size: 2376704 |
Author:xizeyi123 |
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