Извините, этот техт доступен только в “Американский Английский”. For the sake of viewer convenience, the content is shown below in the alternative language. You may click the link to switch the active language.
THE EFFECT OF INCREASING THE BANDWIDTH
OF A TWO-CHANNEL RECEIVER ON NOISE-IMMUNITY
Alexander G. Ilyin, Kazan National Research Technical University named after A.N. Tupolev-KAI «(KNITU-KAI), Kazan, Russia, iag29@yandex.ru
Khafaga Ali S. Mahdi, Kazan National Research Technical University named after A.N. Tupolev-KAI «(KNITU-KAI), Kazan, Russia, alisalahelect1985@gmail.com
Abstract
This work discusses the effect of increasing the bandwidth of a two-channel receiver on the noise-immunity of the receiving system at low signal-to-noise ratios (S/N = 0….3). The dependency of the probability of false alarms on the signal-to-noise ratio at different ratios of the receiver bandwidth to the carrier frequency of the signal was given. It is notorious that the noise level increases with the increasing bandwidth of the receiving device, thereby reducing the sensitivity and noise-immunity of the receiving system when receiving pulse signals. In most practical cases, this problem is solved by increasing the signal-to-noise ratio at the input of the receiving device by increasing the power of the transmitter and using linear filtering on the receiving side. However, if we consider that the signal-to-noise ratio is low, the search for new methods to solve this problem is more relevant than ever. Differences in the structures of input processes were used as additional information features and identified using nonlinear converters. It should be emphasized that a phase switch was used as a nonlinear converter. The principle of its operational concept was to change the spectrum of the input process by switching the phase by 180 degrees when the envelope passes through zero. Our research proves that phase jumps in a mixture of signal and noise can be used as secondary information signs. Consequently, a conventional phase detector can be used in the second channel of the receiver. The viability of this idea has been tested in practice, so the main objective of this work was to investigate the possibility of using the above approaches to receiving short radio pulses in narrowband digital communication systems and the effect of increasing the bandwidth of a two-channel receiver on the noise immunity of the receiving system at low signal-to-noise ratios.
Keywords: Phase detector, noise immunity, radio pulse, narrowband noise, broadband noise.
References
- A.G. Ilyin (2005). Increase of noise immunity and transmission capacity of radio engineering and optoelectronic systems based on amplitude-phase transformation of signal and noise. Kazan: Ed.KNITU-KAI Tupolev, 192 p.
- A.G. Ilyin, A.S.M. Khafaga, V. Yunusova (2021). Modeling the Narrowband and Wideband Noise at the Output of Nonlinear Converters. (2021, March). 2021 Systems of Signals Generating and Processing in the Field of on Board Communications, pp. 1-4. IEEE.
URL: https://ieeexplore.ieee.org/document/9416064. DOI:10.1109/IEEECONF51389.2021.9416064 - A.G. Ilyin, G.I. Ilyin, V.S. Baina (2013). The Question of noise immunity of real receiving devices. Vestnik n of KSTU im. A.N. Tupolev. No. 4.
- F.I. Ageev, V.V. Voznuk, M.Y. Khudik (2021). Technique of increase of noise stability of data transmission systems with binary phase-shifted noise-type signals in the conditions of action of noises with different spectral structure. TRUDYMAI, (118). URL: http://trudymai.ru/published.phpID=158242. DOI: 10.34759 / trd-2021-118-08
- V.V. Voznyuk, E.V. Kutsenko (2018). Noise immunity of radio communication systems with binary phase-shift keyed broadband signals under the influence of retransmitted compensation noise such as direct signal inversion. URL: https://www.elibrary.ru/download/ elibrary_34972944_15241525.pdf.
- A.G. Ilyin, A.S. Khafaga (2017). Simulation of the passage of a mixture of narrow-band noise and a useful signal through a phase detector. Collection of scientific papers on the results of the international scientific-practical conference «Prospects and development technologies in the field of technical sciences». February 25, Nizhny Novgorod. Vol. II, pp. 24-26.
- Khafaga Ali .S. Mahdi (2021). Performance Analysis and Comparison of narrowband noise passing through filter types (Elliptic) and (Butterworth). Journal of Physics: Conference Series. Vol. 1973. No. 1. IOP Publishing, 2021. URL: https://iopscience.iop.org/article/10.1088/ 1742-6596/1973/1/012009/pdf DOI:10.1088/1742-6596/1973/1/012009
- V.I. Borisov, V.M. Zinchuk (2008). Interference immunity of radio communication systems. Probability-time approach. Moscow: RadioSoft. 260 p.
Information about authors:
Alexander G. Ilyin, Doctor of Technical Sciences, prof. Electronic and Quantum Information Transmission Systems, Kazan National Research Technical University named after A.N. Tupolev-KAI (KNITU-KAI), Kazan, Russia
Khafaga Ali S. Mahdi, postgraduate student, Electronic and quantum systems of information transmission, Kazan National Research Technical University named after A.N. Tupolev-KAI (KNITU-KAI), Kazan, Russia