Cumulative fade distributions and frequency scaling techniques at 20 GHz from the Advanced Communications Technology Satellite and at 12 GHz from the digital satellite system

Goldhirsh, J.; Musiani, B.H.; Vogel, W.J.

doi:10.1109/5.598413

Cited by 15 publications

(1 citation statement)

References 14 publications

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“…Such rain rates are considered excessive and rare in that they are expected to occur less than 0.02% of the time (or 1.75 hours per year) for the mid-Atlantic coast [Goldhirsh et al, 1997].…”

Section: Influence Of Rain Rate Scattermentioning

confidence: 99%

Signal level statistics and case studies for an over‐the‐horizon mid‐Atlantic coastal link operating at C‐band

Goldhirsh¹,

Musiani²

1999

Radio Science

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Abstract. We examine the results of 1 year of near-continuous measurements for a 128-km over-the-horizon C-band coastal propagation link. The link extends between Dam Neck, Virginia (16 km south of Virginia Beach), and Wallops Island, Virginia (approximately 150 km southeast of Washington, D.C.). The objectives of this effort are to explore the different mechanisms of propagation through an analysis of several case studies and to assess the statistical connectivity over the 1-year period. Case studies involving the linking of environmental information and measured signal levels are analyzed. Propagation factor levels due to evaporation ducts, surface ducts, and scattering from irregularities of the refractive index in the common volume are determined. Cumulative distributions of the measured propagation factor for the annual, fall-winter, and spring-summer periods are presented. Conditional and absolute distributions of propagation factor time durations are also presented and analyzed. It is demonstrated that during the spring-summer period, received signal levels were consistent with ducting and not with troposcatter. The fall-winter levels may be due to troposcatter from irregularities of the refractive index. The months giving the smallest and largest propagation factors were January and June, respectively. IntroductionThere is a continuing need to better understand the propagation conditions associated with ship-to-ship and ship-to-shore communications and radar opera-

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Section: Influence Of Rain Rate Scattermentioning

confidence: 99%

Signal level statistics and case studies for an over‐the‐horizon mid‐Atlantic coastal link operating at C‐band

Goldhirsh¹,

Musiani²

1999

Radio Science

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Millimeter Wave Propagation

Altshuler

2003

Wiley Encyclopedia of Telecommunications

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The propagation characteristics in the millimeter‐region of the electromagnetic spectrum are of particular interest because the waves have a strong interaction with atmospheric gases and particulates, which in turn limits the system performance. However, the availability of large bandwidths make these wavelengths attractive for high data rate communications. Furthermore, high gain, high resolution antennas of moderate size and lightweight, compact system components are indeed applicable for space vehicle instrumentation. The limitations imposed by the atmosphere on millimeter‐wave systems are reviewed. In general, atmospheric effects become more severe as the wavelength becomes shorter.

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Ka‐band link optimization with rate adaptation for Mars and lunar communications

Sun

Gao

Shambayati

et al. 2007

Satell Commun Network

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SUMMARYOn-going development of Ka-band capability for the Deep Space Networks (DSN) will radically increase the bandwidth available to support advanced mission concepts envisioned for future robotic as well as human exploration of Mars and beyond. While Ka-band links can operate at much higher data rate than X-band, they are much more susceptible to fluctuating weather conditions and manifest a significant tradeoff between throughput and availability. If the operating point is fixed, the maximum average throughput for deep space Ka-band link is achieved at about 80% availability, i.e. weather-related outages will occur about 20% of the time. Low availability increases the complexity of space mission operation, while higher availability would require additional link margins that lowers the overall throughput. To improve this fundamental throughput-availability trade-off, data rate adaptation based on real-time observation of the channel condition is necessary.In this paper, we model the Ka-band channel using a Markov process to capture the impact of the temporal correlation in weather conditions. We then develop a rate adaptation algorithm to optimize the data rate based on real time feedback on the measured channel conditions. Our algorithm achieves both higher throughput and link availability as compared to the constant rate scheme presently in use.

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Cumulative fade distributions and frequency scaling techniques at 20 GHz from the Advanced Communications Technology Satellite and at 12 GHz from the digital satellite system

Cited by 15 publications

References 14 publications

Signal level statistics and case studies for an over‐the‐horizon mid‐Atlantic coastal link operating at C‐band

Signal level statistics and case studies for an over‐the‐horizon mid‐Atlantic coastal link operating at C‐band

Millimeter Wave Propagation

Ka‐band link optimization with rate adaptation for Mars and lunar communications

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