Verifying a concept of adaptive communication with LEO satellites using SDR-based simulations

AbstractThe paper is related to an adaptive satellite communication system for data transmission from small, low cost, low Earth orbit satellites. Tests run in a set-up consisting of a number of software-defined radio (SDR) modules operating as a satellite, a ground station, and a satellite channel simulator, have shown that by changing modulation scheme and code rate one can obtain increase of amount of data which can be downloaded from a satellite during a single pass over a ground station approximately by a factor of 2. To determine data rates obtainable in an SDR system using a common personal computer as a digital signal processing device, execution times of particular processing steps involved in the reception process were measured.

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DEVELOPMENT OF A SPACE TECHNOLOGY CAPACITY BUILDING INITIATIVE AT THE FEDERAL UNIVERSITY OF TECHNOLOGY, AKURE, NIGERIA

FUTA JOURNAL OF ENGINEERING AND ENGINEERING TECHNOLOGY ◽

10.51459/futajeet.2021.15.1.267 ◽

2021 ◽

Vol 15 (1) ◽

pp. 38-52

Author(s):

Folasade Dahunsi ◽

Oluwasina Aderinwale ◽

Abayomi Adesida ◽

Abiola Alayande ◽

J. Ojo ◽

...

Keyword(s):

Capacity Building ◽

Satellite Communication ◽

Spatial Information ◽

Low Cost ◽

Data Communication ◽

Positive Development ◽

Space Technology ◽

Ongoing Research ◽

Ground Station ◽

Means Of Transmission

Satellite communication is a wireless means of transmission of intelligible signals/information. When properly utilized it will bring about a great and positive development on the economic growth of any nation. The Federal Government of Nigeria made a giant step in the communication sector by launching five satellites into space: NigeriaSat-1, NigComSat- 1, NigeriaSat-2r, NigeriaSat-X and NigComSat-1R. With adequate spatial information, informed decisions can be made by stakeholders and adequate steps taken to ensure the growth of the nation. Demand for training capacity building in space technology is increasing. Unfortunately, space technology is a relatively expensive field with ongoing research for affordable training approaches. This paper presents methods of building capacity by developing Demo Satellites that receive telemetry data with radiofrequency and internet of things communication protocol. Web Dashboard was developed for remote monitoring of ground station and for exploring mobility in data communication, Localization was achieved to also track the Demo Satellites and the ground station in real-time. It is shown that the implementation of a low-cost capacity building programme is not only possible but a goal that should be aimed at. Multiple segments in the design of the schematics produced can be reused. It presents a pioneer satellite constellation prototype that displays the capabilities of a satellite in solving some of the countryâ€™s challenges and creating awareness on space research and its trends.

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A reconfigurable software defined ultra-wideband impulse radio transceiver

Advances in Radio Science ◽

10.5194/ars-8-67-2010 ◽

2010 ◽

Vol 8 ◽

pp. 67-73 ◽

Cited By ~ 4

Author(s):

M. D. Blech ◽

A. T. Ott ◽

P. Neumeier ◽

M. Möller ◽

T. F. Eibert

Keyword(s):

Software Defined Radio ◽

Matched Filter ◽

Digital Signal ◽

Impulse Radio ◽

Ultra Wideband ◽

Modulation Scheme ◽

Digital To Analog Converter ◽

Shift Keying ◽

Reconfigurable Software ◽

Radio Transceiver

Abstract. An ultra-wideband (UWB) software defined radio (SDR) implementation is presented. The developed impulse radio (IR) transceiver employs first order bandpass (BP) sampling at a conversion frequency which is four times the channel bandwidth. The subsampling architecture directly provides the RF signal avoiding any non-ideal mixer stages and reduces the requirements of digital signal processing implemented in a field programmable gate array (FPGA). The transmitter consists basically of a multi-Nyquist digital to analog converter (DAC), whereas the implemented matched filter (MF) receiver prototype employs a standard digitizing oscilloscope. This design can be adaptively reconfigured in terms of modulation, data rate, and channel equalization. The reconfigurable design is used for an extensive performance analysis of the quadrature phase shift keying (QPSK) modulation scheme investigating the influence of different antennas, amplifiers, narrowband interferers as well as different equalizer lengths. Even for distances up to 7 m in a multipath environment robust communication was achieved.

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