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Noise reduction for digital communications – A modified Costas loop

Ladvánszky, János (2020) Noise reduction for digital communications – A modified Costas loop. INFOCOMMUNICATIONS JOURNAL, 12 (4). pp. 2-5. ISSN 2061-2079

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Abstract

An efficient way of noise reduction has been presented: A modified Costas loop called as Masterpiece. The basic version of the Costas loop has been developed for SSB SC demodulation, but the same circuit can be applied for QAM demodulation as well. Noise sensitivity of the basic version has been decreased. One trick is the transformation of the real channel input into complex signal, the other one is the application of our folding algorithm. The result is that the Masterpiece provides a 4QAM symbol error rate (SER) of 6*10-4 for input signal to noise ratio (SNR) of -1 dB. In this paper, an improved version of the original Masterpiece is introduced. The complex channel input signal is normalized, and rotational average is applied. The 4QAM result is SER of 3*10-4 for SNR of -1 dB. At SNR of 0 dB, the improved version produces 100 times better SER than that the original Costas loop does.

Item Type: Article
Subjects: H Social Sciences / társadalomtudományok > HE Transportation and Communications
Q Science / természettudomány > QA Mathematics / matematika > QA75 Electronic computers. Computer science / számítástechnika, számítógéptudomány
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 31 Jan 2021 05:48
Last Modified: 30 Jun 2021 23:24
URI: http://real.mtak.hu/id/eprint/120303

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