Present-day digital data transmission systems should provide a high accuracy for information transmission, maintaining, at the same time, the maximal rate. The systems that apply spectral-effective signal modulation methods enabling to reasonably use the selected section of the frequency spectrum. The orthogonal frequency-division multiplexing (OFDM) is among spectral-effective. This kind of modulation uses its own signal constellation at each subcarrier when transmitting information. The system noise immunity generally depends on the signal point arrangement of a signal constellation. At low noise and interference levels, the signal point arrangement increases, which leads to an increase in the information rate. As the noise and interference level increases, the signal point arrangement decreases, which leads to the transmission rate decrease. In the digital information transmission systems, particularly interesting are asymmetric signal constellations, applying which enable generally improve the system operation quality. Therefore, studying signal constellations is a vital problem nowadays. In this paper, we address the structure and the operation principle of a generator for signal constellations, implemented in the NI LabVIEW software. Using such a generator enables to create signal constellations with an extended configuration, which provides a possibility to investigate the system noise immunity by applying symmetric and asymmetric diagrams (maps).
Universal Generator for Signal Constellations
Lect.Notes Mechanical Engineering
Proceedings of 10th International Conference on Recent Advances in Civil Aviation ; Kapitel : 22 ; 255-267
2022-10-20
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
NTRS | 1985
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