共查询到17条相似文献,搜索用时 109 毫秒
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基于WRC-19 1.13议题研究框架和国内6 GHz以上IMT-2020(5G)候选频段的兼容性分析要求,针对24.65~25.25 GHz频段IMT-2020(5G)系统对卫星广播系统的干扰进行研究。采用蒙特卡洛的仿真方法,比较了静止轨道卫星经度分别在东经59°、85°、113°时,IMT-2020(5G)系统基站对卫星广播系统上行馈线链路的集总干扰情况。通过仿真分析,评估了5G系统对不同轨位卫星两类载波的集总干扰水平。研究结果表明,在该频段,IMT-2020(5G)系统不会对卫星广播系统产生有害干扰,相关研究结果可为未来毫米波频段IMT-2020(5G)系统频率规划以及保护卫星广播系统提供技术依据。 相似文献
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根据国际电信联盟(International Telecommunication Union,ITU)的相关建议和报告以及技术特性,提出了一种用于分析26 GHz频段IMT-2020(5G)系统与卫星间业务(Inter-Satellite Service,ISS)兼容共存性的方法.方法将全球较大面积部署的国际移动通信系统(International Mobile Telecommunications,IMT)基站合理地建模为一定数量的中心站,从时间和空间两个维度开展分析.其中,时间分析以全球范围的IMT-2020(5G)基站为对象; 空间分析以中国大陆范围的IMT-2020(5G)基站为对象,还考虑了实际的城市人口数量.分析结果表明,在26 GHz频段部署IMT系统,与卫星间业务具有兼容共存的空间. 相似文献
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随着近年来5G网络建设的快速发展,由于其分配频率与卫星固定业务(FSS)标准C波段频率相邻,从而导致移动通信基站对卫星信号接收造成干扰的案例时有发生.本文从几种常见的移动通信基站干扰类型出发,对其成因、现象和排除的措施加以阐述,对解决相应干扰问题具有一定的参考价值. 相似文献
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针对我国Ka频段使用卫星固定业务的非对地静止卫星轨道(Non-Geostationary Satellite Orbit,NGSO)星座系统对对地静止卫星轨道(Geostationary Satellite Orbit,GSO)系统的干扰问题开展研究.在梳理国际电联技术建议书和《无线电规则》的基础上,通过理论分析和仿真计算等手段,对不同链路场景下NGSO星座系统对GSO系统在Ka频段的干扰问题进行分析计算.研究结果表明,在NGSO星座系统与GSO系统上下行通信有重叠部分的频段,其对GSO系统都会产生严重干扰.最后给出降低干扰的措施与建议.为我国未来拟使用Ka频段的NGSO星座系统对GSO系统的干扰分析提供参考. 相似文献
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Jos Mauro P. Fortes 《International Journal of Satellite Communications and Networking》2006,24(1):73-95
This paper focuses on the protection of Fixed Service (FS) receivers from the aggregate interference produced by the satellites of multiple highly elliptical orbit satellite systems (HEOs). It analyzes the protection given to FS receivers operating in the 18 GHz frequency band by different power flux‐density (pfd) masks. These masks establish the maximum allowable pfd produced by each HEO satellite at the Earth's surface. The protections offered by four different pfd masks are analysed in two interfering environments, each containing three HEO systems. Two types of HEO system, with different orbital characteristics, are considered: one having satellites that operate only in the northern hemisphere and another having satellites that operate in both hemispheres. To reflect the multiplicity of possibilities concerning the geographical location and technical characteristics of the victim FS receiver (e.g. latitude, longitude, azimuth and elevation of its receiving antenna, antenna gain, receiver noise temperature, etc.) a large amount of results and curves is usually generated by the studies, making it difficult to draw general conclusions on the protection offered by the pfd masks under analysis. In looking for alternative ways of presenting the obtained results, a new variable was defined: the interference in excess. This new variable was defined in a way so that its probability distribution function reflects the protection given to an FS receiver located at a given latitude with a given receiving antenna elevation angle. It indicates the protection of an FS receiver for which the location longitude and the azimuth of the pointing direction of its receiving antenna are randomly chosen. This allows the large amount of results to be compacted into a small number of more representative curves from which general conclusions on the protection offered by the different pfd masks are easily drawn. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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根据信息产业部无线电管理局信部无(2000)88号文件要求,3400-3430MHz/3500-3530MHz的2×30MHz的频率拟供FDD方式中的高速无线接入使用.经过技术试验及电磁兼容分析,若证明3.5FGHz频段固定无线接入系统(FWA)系统与卫星C扩展频段有频率共用之可能,并确定了共用条件后,可根据FWA系统的技术发展与市场需求,研究和确定FWA系统如何在3400-3600MHz频段内实现与卫星系统的频率公用.若证明两者之间不可兼容,或为避免相互干扰,FWA系统将于2005年底前退出3400-3600MHz频段.本文将对FWA系统与卫星固定业务的兼容性进行分析. 相似文献
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阐述了5G系统毫米波焦点频段(26 GHz频段)全球频谱划分与现有应用概况,对全球研究动态与主要国家和地区的初步观点进行了梳理与总结。结合本频段现有无线电业务应用情况,重点剖析了开展频谱兼容性研究的关键场景、研究方法与主要挑战。最后,对5G系统有助于兼容共存的特征进行了归纳,为后续研究指明了方向。相关内容可为该频段5G频率规划提供借鉴。 相似文献
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Anna Carolina Finamore José Mauro P. Fortes 《International Journal of Satellite Communications and Networking》2008,26(3):211-230
This paper focuses on the protection of fixed service (FS) receivers from the aggregate interference produced by the satellites of multiple highly elliptical orbit satellite systems (HEOs). It analyzes the protection given to FS receivers operating in the 18 GHz frequency band by the power flux‐density (pfd) mask contained in Article 21 of the 2003 edition of the Radio Regulations [International Telecommunication Union, 2003.]. This mask establishes the maximum allowable value for the pfd produced by any of the satellites of a non‐geostationary system at the Earth's surface. The protection offered to FS receivers by this mask is analyzed in four interfering environments, each containing three identical HEO systems. Four types of HEO systems, with different orbital characteristics, are considered: three having satellites that operate only in the northern hemisphere and one having satellites that operate in both hemispheres. All satellite antennas are assumed to radiate 0.3° spot beams. Each HEO satellite is modelled so that the maximum pfd it produces at the Earth's surface just meets the RR Article 21 mask and the analysis takes into account the roll‐off characteristics of the satellite antenna beams. To reflect the multiplicity of possibilities concerning the geographical location and technical characteristics of the victim FS receiver (e.g. latitude, longitude, azimuth and elevation of its receiving antenna, antenna gain, receiver noise temperature, etc.) a number of cases were evaluated. The concept of interference in excess [Int. J. Satellite Commun. Networking 2006; 24 : 73–95] was used to combine the results corresponding to FS receivers located at the same latitude and having the same receiving antenna elevation angle but for which the location longitude and the azimuth of the pointing direction of its receiving antenna are randomly chosen. Results are expressed in terms of the cumulative distribution function of the interference in excess. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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José Mauro P. Fortes Juan Otalora Goicochea 《International Journal of Satellite Communications and Networking》2012,30(4):147-162
This paper presents a compatibility analysis involving space research service lunar mission uplink transmissions and the inter‐satellite links of non‐geostationary orbit systems operating in the 22‐GHz band. Three points differentiate this analysis from the currently available studies: (1) the mathematical model used here allows for the consideration of the time varying nature of the inclination of the Moon orbital plane; (2) besides the usual unconditional interference cumulative distribution functions, this analysis also considers the conditional cumulative distribution functions given that the victim satellite is receiving interference, important to characterize the interference affecting users that, because of their location, are most of the time using satellites, which are under interference; and (3) instead of dynamic time simulation, the analytical method in Recommendation ITU‐R S.1529 is used to determine the various cumulative distribution functions involved. Four scenarios are examined in the paper. Their main differences concern the number and location of the space research service transmitting Earth stations and the strategy under which they are active (transmitting). In all scenarios, cumulative distribution functions of the ratio I/N were determined for both the in‐band and the out‐of‐band interference cases. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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On the protection of fixed service receivers from the interference generated by non‐GSO satellite systems operating in the 3.7‐4.2 GHz band 下载免费PDF全文
Isabela Cunha Maia Nobre Jose Mauro Fortes 《International Journal of Satellite Communications and Networking》2018,36(5):383-401
In this work, the current power‐flux density limits in Article 21 of the ITU‐R Radio Regulations for non‐geostationary satellite orbit (GSO) systems operating in the 3.7‐4.2 GHz band are analyzed. These limits aim the protection of fixed service receivers, operating in the same frequency band, from the interference produced by non‐GSO satellite systems. The analysis was motivated by Resolution 157 of the World Radiocommunication Conference 2015, that recognized the need for a revision of Article 21 with a view to enabling non‐GSO systems to operate in these fixed‐satellite service frequency bands while ensuring that existing primary services are protected. In the analysis, 5 different circular Walker Delta type satellite constellation structures, adequately chosen, are considered, and the results show that the current power‐flux density (pfd) limits may impose undue constraints to non‐GSO systems operating in this band. Therefore, a methodology to investigate a more adequate pfd limiting mask is presented and used to generate an alternative mask. An evaluation of the proposed pfd mask shows that it does not impose unnecessary constraints to the non‐GSO satellite systems. This, along with other facts, indicates that the proposed pfd limits are, indeed, much more adequate than the current ones. 相似文献
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K. Vasu Babu Sudipta Das Syed Samser Ali Mohammed EL Ghzaoui Boddapati Taraka Phani Madhav Shobhit K. Patel 《International Journal of Communication Systems》2023,36(6):e5442
A small size neutralization line integrated flower-shaped MIMO antenna is designed and analyzed for sub-6 GHz type 5G NR frequency bands like n79 (4400–5000 MHz), n78 (3300–3800 MHz), n77 (3300–4200 MHz), and WLAN (5150–5825 MHz) applications. The novel approach of theory of characteristic mode analysis (TCMA) is introduced to provide physical insight of the designed structure and its characteristics behavior. Due to the suggested modifications in the geometry, the isolation among the patches is greatly increased. The overall miniaturized dimension of the MIMO antenna is 25 × 40 mm2. The edge-edge spacing among the elements is 0.0233λ. The prototype antenna is fabricated and measured that shows good agreement compared with simulated results. The designed MIMO antenna without the presence of decoupling structure offers an isolation of 28 dB, gain of 3.6 dBi, and radiation efficiency of 69.7% at the resonant frequency. The proposed MIMO antenna covers a broad range of frequency band from 3.296 to 5.962 GHz with −10 dB impedance bandwidth of 2666 MHz and maintains a good isolation of greater than 50 dB for the entire operating band. The tested radiation efficiency and gain are 85.3% and 6.22 dBi at 3.5 GHz. Moreover, the diversity parameters of the neutralization line integrated MIMO antenna, that is, channel capacity loss (CCL) isolation, mean effective gain (MEG), total active reflection coefficient (TARC) diversity gain (DG), and envelope correlation coefficient (ECC), are analyzed and discussed in this article. 相似文献