Smart Beamforming for Direct Access to 5G-NR User Equipment from LEO Satellite at Ka-Band

Study how spatial diversity can help in massive IoT and develp signal processing access for MIMO beamformingNon-Terrestrial Networks (NTN), in particular LEO Satellite Networks, are expected to play a key role in extending and complementing terrestrial 5G networks in order to provide services to air, sea and un-served or under-served areas. This work proposes the implementation of a novel scheme called Resource Sharing Beamforming Access (RSBA), which seems a promising solution to deal with scenarios where Bit Error Rate (BER), probability of collision and/or achievable rate are important aspects of study. Given the system architecture presented in this work, RSBA will be proposed as solution in the 5G-NR Sat-IoT scenario. As it is expected, a huge amount of IoT devices will be transmitting in the uplink, and being the case of Non-Orthogonal-Multiple-Access (NOMA), the risk of collisions between devices will increase. The idea, after assessing the channel impairments of a direct link between a LEO Satellite and a NB-IoT device, it to study how spatial diversity via smart beamforming at the receiver will reduce the probability of collision between the devices, and thus increasing the number of users that can access to the media

Hybrid Satellite-Terrestrial Communication Networks for the Maritime Internet of Things: Key Technologies, Opportunities, and Challenges

With the rapid development of marine activities, there has been an increasing number of maritime mobile terminals, as well as a growing demand for high-speed and ultra-reliable maritime communications to keep them connected. Traditionally, the maritime Internet of Things (IoT) is enabled by maritime satellites. However, satellites are seriously restricted by their high latency and relatively low data rate. As an alternative, shore & island-based base stations (BSs) can be built to extend the coverage of terrestrial networks using fourth-generation (4G), fifth-generation (5G), and beyond 5G services. Unmanned aerial vehicles can also be exploited to serve as aerial maritime BSs. Despite of all these approaches, there are still open issues for an efficient maritime communication network (MCN). For example, due to the complicated electromagnetic propagation environment, the limited geometrically available BS sites, and rigorous service demands from mission-critical applications, conventional communication and networking theories and methods should be tailored for maritime scenarios. Towards this end, we provide a survey on the demand for maritime communications, the state-of-the-art MCNs, and key technologies for enhancing transmission efficiency, extending network coverage, and provisioning maritime-specific services. Future challenges in developing an environment-aware, service-driven, and integrated satellite-air-ground MCN to be smart enough to utilize external auxiliary information, e.g., sea state and atmosphere conditions, are also discussed

Millimeter communication propagation program, volume III Final report, 1 Nov. 1964 - 1 Nov. 1965

Annotated bibliography for millimeter wave communication propagation program for space-earth communication

Abstracts on Radio Direction Finding (1899 - 1995)

The files on this record represent the various databases that originally composed the CD-ROM issue of "Abstracts on Radio Direction Finding" database, which is now part of the Dudley Knox Library's Abstracts and Selected Full Text Documents on Radio Direction Finding (1899 - 1995) Collection. (See Calhoun record https://calhoun.nps.edu/handle/10945/57364 for further information on this collection and the bibliography). Due to issues of technological obsolescence preventing current and future audiences from accessing the bibliography, DKL exported and converted into the three files on this record the various databases contained in the CD-ROM. The contents of these files are: 1) RDFA_CompleteBibliography_xls.zip [RDFA_CompleteBibliography.xls: Metadata for the complete bibliography, in Excel 97-2003 Workbook format; RDFA_Glossary.xls: Glossary of terms, in Excel 97-2003 Workbookformat; RDFA_Biographies.xls: Biographies of leading figures, in Excel 97-2003 Workbook format]; 2) RDFA_CompleteBibliography_csv.zip [RDFA_CompleteBibliography.TXT: Metadata for the complete bibliography, in CSV format; RDFA_Glossary.TXT: Glossary of terms, in CSV format; RDFA_Biographies.TXT: Biographies of leading figures, in CSV format]; 3) RDFA_CompleteBibliography.pdf: A human readable display of the bibliographic data, as a means of double-checking any possible deviations due to conversion

Radio Occultation Method for Remote Sensing of the Atmosphere and Ionosphere

Non

Solar Radio Burst Effects on Global Positioning System Receivers

This thesis presents a series of studies investigating solar radio burst effects on Global Positioning System (GPS) receivers along with supporting instrumentation and analysis techniques. Solar radio bursts are a space weather phenomenon with its origins at the sun. Although solar radio bursts have been widely studied since the 1960s and have been known to cause notable problems for radio communication systems such as cell phone networks (Lanzerotti et al., 1999) their impact on GPS was underestimated and largely ignored by the community. Recent large solar radio burst events in conjunction with accurate carrier-to-noise measurements from GPS receivers has allowed for the first precise qualitative and quantitative analysis of their impact. To the receiver, a solar radio burst is a wide-band radio interference source that causes an effective decrease in the received carrier-to-noise ratio. The analysis of moderate events on 7 September 2005 allowed for the prediction that larger solar radio bursts would present a significant challenge to GPS availability as soon as the next solar maximum in 2011-2012 (Cerruti et al., 2006). The future came sooner than expected when the record setting solar radio burst of 6 December 2006 caused wide-spread outages of GPS receivers. The event exceeded 1,000,000 SFU, was about ten times larger than any previously reported event, and was all the more surprising since the solar radio bursts occurred near solar minimum. These events had a drastic impact on several critical GPS systems utilized by the scientific community, the Federal Aviation Administration, oil-rig operations, orbiting satellites, and surveying. The size of the December 2006 bursts strongly suggests that the historical record may be inaccurate and raises the possibility for even more intense solar radio bursts during the next solar maximum that will significantly impact the operation of GPS receivers.Office of Naval Research Grant N00014-04-1010