Impact of Noise Figure on a Satellite Link Performance

Ekpo, Sunday; George, Danielle

doi:10.1109/lcomm.2011.072011.111073

Cited by 36 publications

(30 citation statements)

References 8 publications

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“…From (11), the total in-orbit PERs of capability-based microsatellites for planetary missions in LEO are similar to the estimating relationships presented in case studies 1 and 2 in (12) and (13).…”

Section: Planetary Missionsupporting

confidence: 68%

“…Based on the database of past spacecraft missions, the communication and planetary spacecraft would require at least 56 and 122 W, respectively, for an appreciable mission accomplishment [1]. From (11), the total in-orbit PERs of capability-based microsatellites for communication missions in LEO are similar to the case studies 1 and 2 in (12) and (13). Table IV shows the HASS power budget analysis for a communication mission.…”

Section: B Communication Missionmentioning

confidence: 88%

“…Single-use, computer-aided models for conceptual design represent a system engineering design process tool for the entire spacecraft modules and their respective integrated subsubsystems and subsystems [2], [3], [11]- [13]. This approach allows for a more detailed analysis of the spacecraft subsystems and their interdependencies than the back-of-the-envelope technique.…”

Section: Satellite System Engineeringmentioning

confidence: 99%

“…A link design involves the development of a comprehensive budget based on the parameters that characterize a given satellite communication system network. The following parameters define a satellite communication link: data rate, maximum bit error rate, frequency, modulation and coding, symbol rate, transmitter, antenna gains, system gains and losses, and receiver noise for achieving a given spacecraft mission's required link margin [13]. Carrier link margin and data link margin constitute the two main satellite links margins that characterize the uplink and downlink performances of spacecraft communication system networks [13].…”

Section: A Communication Link Design Parametersmentioning

confidence: 99%

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Parametric System Engineering Analysis of Capability-Based Small Satellite Missions

Ekpo

2019

IEEE Systems Journal

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To achieve appropriate link budget and system engineering analyses of capability-based small satellites missions, an objective assessment and computation of the component-, subsystem-, and system-levels parameters requirements must be carried out. This paper presents the measurement-derived parametric models for the system engineering analysis of communication, meteorology, planetary, and other small satellite programs with recourse to the initial mission, conceptual design, and postmission objectives. Mass and power margins are the critical resources under investigation besides the link contingencies and operational times. The case study spacecraft systems engineering analyses indicate a transmit power for data transmission uplink and downlink of at least 33 dBm for the generic communication, meteorology, and planetary missions applications. The presented parametric models also reveal a signal-to-noise ratio of at least 16 dB per radio communication link for worst case noise floor and path loss. For a 30-W power utilization, a two-power communicationoverpower mode mission operates for an extra 8.3 min compared with a three-power payload-overpower mode mission. This holds a great promise for the development of adaptive subsystems for reconfigurable multiband, and multistandard transponders for multipurpose missions and postmission applications.

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Section: Planetary Missionsupporting

confidence: 68%

Section: B Communication Missionmentioning

confidence: 88%

Section: Satellite System Engineeringmentioning

confidence: 99%

Section: A Communication Link Design Parametersmentioning

confidence: 99%

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Parametric System Engineering Analysis of Capability-Based Small Satellite Missions

Ekpo

2019

IEEE Systems Journal

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“…Wideband low noise amplifiers with low DC power dissipation have been playing a crucial role in various applications like ultra-wideband (UWB) communication, imaging, and software-defined radios [1,2,3]. Over the past few years, a new class of MMIC amplifiers have emerged based on pHEMT technology, with the advantage of both low noise figure and high gain performance [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

4–20 GHz low noise amplifier MMIC with on-chip switchable gate biasing circuit

Chen¹,

Wang²,

Chen³

et al. 2017

IEICE Electron. Express

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A broadband low-noise amplifier (LNA) MMIC with a novel onchip switchable gate biasing circuit is proposed. The biasing circuit is able to switch on/off the low noise amplifier and compensate the variation of threshold voltage (V th ) and temperature, hence improving the robustness of the amplifier over a wide operating frequency range. The switching frequency is up to 1 MHz, and the fluctuations of on-state quiescent current and power gain of the amplifier are within ²7.9% and ²0.8% when the threshold voltage varies from −0.15 V to 0.15 V. The power gain variation is stabilized within ²1.25 dB by the biasing network, while the temperature changes from −55°C to 125°C. Realized in 0.15 µm E-mode pHEMT technology with size of 2.0 mm × 1.3 mm, the LNA provides a typical gain of 24 dB while maintaining input and output return loss better than 10 dB and the noise figure (NF) of the LNA smaller than 1.6 dB from 4 GHz to 20 GHz.

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