HERMES Radio: Energy and Spectral Efficient Transmitter architectures for small satellites

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

As the complexity of nanosatellite missions have increased over time, the data generated on-board nanosatellites have increased multiple folds. As a result, there is a need to downlink large amounts of data. Multiple nanosatellite missions have started using spectral efficient modulation schemes recommended in DVB.S2 and DVB.S2X to make the best use of the available spectrum. One of the main challenges in adopting higher order modulation schemes is to power-efficiently upconvert and amplify the baseband signals. All the lost efficiency in converting the DC power to the RF output is dissipated as heat and the relatively small thermal mass of nanosatellites poses thermal management challenges. As a first step to addressing the challenge of improving the power efficiency of the communication module, optimization techniques to improve the Peak to Average Power Ratio (PAPR) of the modulation schemes (16/32-APSK) are discussed in this paper. The PAPR of 16-APSK reduces by ~2 dB by incorporating filtering techniques discussed in this paper. Further, a well-known efficiency and linearity enhancement technique; Out-phasing/LINC (Linear Amplification using Non-linear Components) is discussed. As a variant of the out-phasing architecture, a novel approach is proposed using two circularly polarized antenna to transmit the constant envelope signals in opposite polarizations and signal combining is performed at the receiver. Simulations results are used to demonstrate how higher efficiencies can be achieved using the proposed architecture.
Original languageEnglish
Title of host publicationProceedings of the 2022 IEEE Aerospace Conference (AERO)
PublisherIEEE
Pages1-10
Number of pages10
ISBN (Electronic)978-1-6654-3760-8
ISBN (Print)978-1-6654-3761-5
DOIs
Publication statusPublished - 2022
Event2022 IEEE Aerospace Conference (AERO) - Big Sky, United States
Duration: 5 Mar 202212 Mar 2022

Publication series

NameIEEE Aerospace Conference Proceedings
Volume2022-March
ISSN (Print)1095-323X

Conference

Conference2022 IEEE Aerospace Conference (AERO)
Country/TerritoryUnited States
CityBig Sky
Period5/03/2212/03/22

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