Parametric System Engineering Analysis of Capability-Based Small Satellite Missions

Ekpo, Sunday

doi:10.1109/jsyst.2019.2919526

Cited by 25 publications

(16 citation statements)

References 18 publications

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“…The gain shown in Fig. 8 is 40 dB at the band ripple factor across the required end subsystems [30].…”

Section: And Discussionmentioning

confidence: 94%

“…receiver sens operating frequency. This appears to justify the choice of the 50 MHz bandwidth for satellite video signals transmission [22], [30] characterization, the allowable temperature drift is ome equipment allow for up to 3 ambient temperature. For any given fabricated MMIC LNA that is characterized, 0.1 to 0.2 dB is the allowable loss margin for linear (S loss of above 1 that there is a need to enhance the receiver sensitivity by performing a component reconfiguration in near real…”

Section: Iv2mentioning

confidence: 99%

“…14), the 50 MHz margin yields the best itivity threshold [8] over the X operating frequency. This appears to justify the choice of the 50 MHz bandwidth for satellite video signals transmission [22], [30] characterization, the allowable temperature drift is equipment allow for up to 3 ambient temperature. For any given fabricated MMIC LNA that is characterized, 0.1 to 0.2 dB is the allowable loss margin for linear (S dB is unacceptable.…”

Section: Band Receiver Sensitivity Simulationmentioning

confidence: 99%

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8-12 GHz pHEMT MMIC Low-Noise Amplifier for 5G and Fiber-Integrated Satellite Applications

Uko

Ekpo

2020

IREASE

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The fifth-generation (5G) radio access technology promises to revolutionise integrated earth-space communications applications for ubiquitous, seamless and broadband services. The assigned sub-6 GHz and millimetre-wave 5G frequencies require the sensitivity of the receiver front-end subsystem(s) to detect and amplify the desired signal at a noise floor of less than -90 dBm for a cost-effective infrastructure deployment. This paper presents a broadband Monolithic Microwave Integrated Circuit (MMIC) Low-Noise Amplifier (LNA) design based on a 0.15 µm gate length Indium Gallium Arsenide (InGaAs) pseudomorphic high electron mobility transistor (pHEMT) technology for 5G and fiber-integrated satellite communications applications. The designed three-stage 8-12 GHz LNA implements a common-source topology. The MMIC LNA subsystem performance demonstrates an industry-leading in-band gain response of 40 dB; a noise figure of 1.0 dB; and a power dissipation of 43 mW. For a constant bandwidth receiver, the sensitivity changes by approximately 1.5 dB over the operating satellite signal frequency. Similarly, for a variable bandwidth receiver, the sensitivity changes by approximately 1.5 dB over the channel bandwidth. Moreover, the sensitivity margin of the designed LNA is 40 dB and this holds a great promise for real-time radio access component-level reconfiguration applications.

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“…The gain shown in Fig. 8 is 40 dB at the band ripple factor across the required end subsystems [30].…”

Section: And Discussionmentioning

confidence: 94%

Section: Iv2mentioning

confidence: 99%

Section: Band Receiver Sensitivity Simulationmentioning

confidence: 99%

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8-12 GHz pHEMT MMIC Low-Noise Amplifier for 5G and Fiber-Integrated Satellite Applications

Uko

Ekpo

2020

IREASE

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“…The proposed HPDC can be realised within a monolithic microwave integrated circuit (MMIC) low-noise amplifier for adaptive satellite-cellular convergence applications [11], [12]. The novel research findings from the HPDC design holds great promise for advanced capabilitybased reconfigurable R.F transceiver and regenerative satellite transponder frontends [13]- [19]. Moreover, the HPDC is an excellent R.F architecture for hybrid beamformer development for 5G MIMO antenna integration.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Power Divider and Combiner for Passive RFID Tag Wireless Energy Harvesting

Zafar

Ekpo

George³

et al. 2022

IEEE Access

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This paper presents three-and five-ports radio frequency (R.F) hybrid power divider combiner (HPDC) designs with multiband characteristics operating at 2.4 GHz (ISM, IEEE 802.11b,g); 5.8 GHz (IEEE 802.11n, a and 802.11ac); and 6 GHz (IEEE 802.11ax) wireless standards for energy-efficient 5G-enabled passive Internet of Things (IoTs) sensors; energy harvesting (E.H); passive radio frequency identification (RFID) tags; multiple-input multiple-output (MIMO) antenna beamforming; and data communication applications spanning D.C to the 6-GHz frequency range. The presented HPDC designs operate at a centre-design frequency of 3 GHz on a Rogers RO4350 substrate. The designed novel HPDC demonstrates a good match between the ports, high isolation between the output ports, and equal power distribution between the output ports. Furthermore, the obtained return and isolation losses are less than -10 dB for the Wi-Fi 6E standards. The reported findings hold an excellent promise for R.F energy harvesting and utilisation, adaptive intelligent energy-efficient data communication, and seamless, ubiquitous satellite-cellular convergence connectivity applications. INDEX TERMS5G Communication; Energy harvesting; Power divider and combiner; Passive RFID tags; Wi-Fi; Satellite.

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“…A detailed explanation of the factors affecting the link is available in [11]. However, the main challenge for LEO link budgets is not the calculation of the attenuation and atmospheric losses [12], but how to integrate those with the spacecraft mobility over the Earth's surface [13], [14].…”

Section: Introductionmentioning

confidence: 99%

Link Budget Analysis for LEO Satellites Based on the Statistics of the Elevation Angle

et al. 2022

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Link budgets are widely applied to evaluate communication links for low Earth Orbit (LEO) satellites. However, approaches to calculate the received power from LEO satellites have followed similar procedures to those for Geostationary (GEO) satellites and other fixed distance wireless systems, ignoring the satellite mobility that causes continuous changes in the path length and in the elevation angle. Link budgets found in the literature for LEO communication systems have commonly opted to characterize the best and worst-cases of the received signal; however, this common approach tells little about how often those cases occur, and little can be inferred about the expected received power and its measures of dispersion. This article introduces an innovative methodology to evaluate LEO link budgets using the long term statistics and probabilities of occurrence of the elevation angle, which is characterized in this work through a random variable. This characterization of the elevation angle through a random variable allows the calculation of the expected value of the received power, its standard deviation, quantiles, among other quantities. The received power is essential to calculate other link indicators such as the carrier-to-noise ratio (C/N), and with the proposed methodology it can be now calculated considering the path length and elevation angle variability that occur for LEO satellites.

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Parametric System Engineering Analysis of Capability-Based Small Satellite Missions

Cited by 25 publications

References 18 publications

8-12 GHz pHEMT MMIC Low-Noise Amplifier for 5G and Fiber-Integrated Satellite Applications

8-12 GHz pHEMT MMIC Low-Noise Amplifier for 5G and Fiber-Integrated Satellite Applications

Hybrid Power Divider and Combiner for Passive RFID Tag Wireless Energy Harvesting

Link Budget Analysis for LEO Satellites Based on the Statistics of the Elevation Angle

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