Noise Reduction for Digital Communications—The Masterpiece, a Modified Costas Loop
- 1 Retired from Ericsson Hungary, Budapest, Hungary
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 (quadrature amplitude modulation) 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. In our times, this topic has a special importance because by application of our Masterpiece, all dangerous field strengths from 5G and WiFi, could be decreased by orders of magnitude. The Masterpiece can break the Shannon formula.
- Proakis, J.G. (2001) Digital Communications. McGraw-Hill, New York.
- Best, R.E., Kuznetsov, N.V., Leonov, G.A., Yuldashev, M.V. and Yuldashev, R.V. (2016) Tutorial on Dynamic Analysis of the Costas Loop. Annual Reviews in Control, 42, 27-49. https://doi.org/10.1016/j.arcontrol.2016.08.003
- Ladvánszky, J. (2017) A Costas Loop with Differential Coding. International Journal of Contemporary Research and Review, 8, 20308-20314.
- Ladvánszky, J. (2018) A Costas Loop Variant for Large Noise. Journal of Asian Scientific Research, 8, 144-151. https://doi.org/10.18488/journal.2.2018.83.144.151
- Hilt, A. Maury, G. and Cabon, B. (1999) Radio-Frequency Interference in Digital Communication Links. Journal of Communications, 50, 36-43.
- Ladvánszky, J. Quantum Communications Are at Hand—The Hungarian Concept. In Press.
- Ladvánszky, J. and Kovács, B. (2018) Methods and Apparatus for Signal Demodulation. Ericsson Patent, 2018.03.01. P74032 WO1; PCT Application Date: 3/1/2018; Application Nr. PCT/SE2018/050198.