The U.S. filings for multimedia satellites: a review

Evans, J. V.

doi:10.1002/1099-1247(200005/06)18:3<121::aid-sat679>3.0.co;2-k

Cited by 9 publications

(3 citation statements)

References 1 publication

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“…Broadband satellite constellation networks have been proposed at GEO (geostationary orbit), LEO (lower earth orbit), MEO (medium earth orbit) and HEO (highly elliptical orbit). These satellite systems provide medium and high capacity wireless data services, and are interconnected with the existing terrestrial networks [[6], [7]]. Networking using satellites began by using individual satellites in geostationary orbit (GEO), where the signals were amplified and then uplinked to the GEO satellite.…”

Section: Fast Retransmitmentioning

confidence: 99%

Robust TCP (TCP-R) with Explicit Packet Drop Notification (EPDN) for Satellite Networks

Sathiaseelan

Radzik

2005

Networking - ICN 2005

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Abstract. Numerous studies have shown that packet reordering is common, especially in satellite networks where there are regular handoffs occurring between neighboring satellites. Reordering of packets decreases the TCP performance of a network, mainly because it leads to overestimation of the congestion of the network. We consider satellite networks and analyze the performance of such networks when reordering of packets occurs. We propose a solution that could significantly improve the performance of the network when reordering of packets occurs in the satellite network. We report results of our simulation experiments, which support this claim. Our solution is based on enabling the senders to distinguish between dropped packets and reordered packets.

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Section: Fast Retransmitmentioning

confidence: 99%

Robust TCP (TCP-R) with Explicit Packet Drop Notification (EPDN) for Satellite Networks

Sathiaseelan

Radzik

2005

Networking - ICN 2005

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“…This coincided with a flurry of activity in the US aerospace industry and led to a large number of applications for use of those frequencies [Evans, 2000]. The FCC has been the prime mover at Receiving a license for a satellite constellation requires the licensee to commit to launching the described service and using the allocated frequencies by a specified date.…”

Section: Benefits Of Going To Leomentioning

confidence: 99%

Satellite Constellation Networks

Wood

2003

Internetworking and Computing Over Satellite Networks

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Abstract:Satellite constellations are introduced. The effects of their orbital geometry on network topology and the resulting effects of path delay and handover on network traffic are described. The design of the resulting satellite network as an autonomous system is then discussed.Key words: satellite constellation, network, autonomous system (AS), intersatellite link (ISL), path delay and latency, orbit geometry, Walker, Ballard, star, rosette, Iridium, Teledesic, Globalstar, ICO, Spaceway, NGSO non-geostationary orbit, LEO low earth orbit, MEO medium earth orbit. INTRODUCTIONA single satellite can only cover a part of the world with its communication services; a satellite in geostationary orbit above the Equator cannot see more than 30% of the Earth's surface [Clarke, 1945]. For more complete coverage you need a number of satellites -a satellite constellation. We can describe a satellite constellation as a number of similar satellites, of a similar type and function, designed to be in similar, complementary, orbits for a shared purpose, under shared control. Satellite constellations have been proposed and implemented for use in communications, including networking. Constellations have also been used for geodesy and navigation (the Global Positioning System [Kruesi, 1996] and Glonass [Börjesson, et al., 1999]), for remote sensing, and for other scientific applications.The 1990s were perhaps the public heyday of satellite constellations. In that decade several commercial satellite constellation networks were 14 INTERNETWORKING AND COMPUTING OVER SATELLITE NETWORKSconstructed and came into operation, while a large number of other schemes were proposed commercially to use available frequency bands, then loudly hyped and later quietly scaled back or dropped.1998 saw the long-awaited launch of commercial services using the 66-active-satellite LEO (low-earth-orbiting) Iridium system constructed by Motorola [Leopold and Miller, 1993]. Iridium demonstrated the feasibility of Ka-band radio intersatellite links (ISLs) directly interconnecting satellites for wide-scale intersatellite networking. However, Iridium's commercial feasibility was not demonstrated before its operating company had filed for bankruptcy protection. The widespread adoption of mobile telephony and roaming between cellular networks worldwide, largely due to the European GSM standard, had usurped much of Iridium's expected target 'business traveller' market for voice telephony to satellite handsets during the Iridium system's decade-long design and construction period. Iridium's services were later relaunched by a second company, which did not suffer from the original company's need to repay crippling construction debtsThe 48-active-satellite LEO Globalstar system [Wiedeman and Viterbi, 1993], relying heavily on CDMA-based frequency-sharing technology from Qualcomm, followed Iridium, and found the market for a voice telephony service just as difficult. Its operating company filed for bankruptcy protection in early 2002. As the mass market for satellit...

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“…With increasing demands for higher transmission data rate and sensing resolution, many communication and radar applications in Ku-band are emerging, including broadcasting [1,2], broadband internet services [3][4][5], synthetic aperture radar (SAR) [6][7][8][9][10][11]. In particular, the Ku 12 and 18 GHz bands each have about 2-GHz bandwidth, and they can be used to realize flexible point-to-point (P2P) microwave backhaul link for non-urban areas [12,13].…”

Section: Introductionmentioning

confidence: 99%

A Ku-band transmitter front-end in 65-nm CMOS with >45-dBc image-rejection ratio and >43-dBc LOFT suppression

Duan

Chen

Wang

et al. 2023

IEICE Electron. Express

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This paper presents a fully integrated Ku-band transmitter frontend with high image rejection ratio (IRR), local oscillator feedthrough (LOFT) suppression, gain and output power for point-to-point (P2P) communication. To avoid the bulky off-chip image-rejection filter, the Hartley transmitter structure is employed, in which frequency plan is undertaken to improve the IRR and LOFT performance, and a two-stage polyphase filter (PPF) and an in/quadrature-phase (I/Q) Gilbert mixer are utilized to improve the IRR further. With the capacitive neutralization and transformer-based series power combining techniques, a two-stage power amplifier (PA) is used to obtain high gain and output power. In the LO buffer, a flexible phase inverting cascode structure is used to achieve reliable upsideband operation, and the inductive peaking technique and cross-coupled transistor pair are employed to promote the LO swing. Fabricated in a 65nm CMOS process, the proposed Ku-band transmitter occupies a chip area of 0.98 mm 2 , and consumes 304-mW power consumption from a 1.2-V supply voltage. With measurements, over 15.8-17.9-GHz radio frequency (RF) bandwidth, the transmitter achieves an IRR and LOFT suppression ratio of 45-55 and 43-52 dBc, respectively. Moreover, it exhibits a conversion gain of 28.5 dB, an output 1-dB compression point (OP1dB) of 13.3 dBm and a saturated output power (Psat) of 16 dBm.

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The U.S. filings for multimedia satellites: a review

Cited by 9 publications

References 1 publication

Robust TCP (TCP-R) with Explicit Packet Drop Notification (EPDN) for Satellite Networks

Robust TCP (TCP-R) with Explicit Packet Drop Notification (EPDN) for Satellite Networks

Satellite Constellation Networks

A Ku-band transmitter front-end in 65-nm CMOS with >45-dBc image-rejection ratio and >43-dBc LOFT suppression

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