Signal processing algorithm efficiency study in adaptive antenna arrays under different levels of interference

DOI: 10.31673/2518-7678.2019.043443

Abstract

The author has developed simple but pretty effective signal processing gradient algorithm for adaptive antenna arrays deployed in mobile networks. The feature of the algorithm is that it does not require presence of the reference signal, which greatly simplifies its practical implementation. Still, the problems of the algorithm operation in situations of complete interfering signals absence or their very low levels were not elaborated. To resolve this problem, tests were carried out of the algorithm in respective noise situations, which indicated that though certain deviations in the directivity patterns from the optimal ones were observed, they insignificantly impacted feasible signal-to-noise ratio. In this case, the lower interfering signal level was, the greater the respective deviations were. It is proposed to perfect the algorithm by introducing a threshold device, which activates adaptation mode only when interference reaches a certain level.

Keywords: mobile networks, adaptive antenna arrays, gradient adaptation algorithms, computer simulation, signal-to-noise ratio, threshold device.

References
1. Гепко И. А., Олейник В. Ф., Чайка Ю. Д., Бондаренко А. В. Современные беспроводные сети: состояние и перспективы развития. – Киев: «ЕКМО», 2009. – 672 с.
2. Монзинго Р. А., Миллер Т. У. Адаптивные антенные решетки: Введение в теорию: Пер. с англ. – Москва: Радио и связь, 1986. – 448 с.
3. Радиоэлектронные системы: Основы построения и теория. Справочник. Изд. 2-е, перераб. и доп. / Под ред. Ширмана Я. Д. – Москва: Радиотехника, 2007. – 512 с.
4. Уидроу Б., Стирнз С. Адаптивная обработка сигналов: Пер. с англ. – Москва: Радио и связь, 1989. – 440 с.
5. Robert J. Mailloux, Phased Array Antenna Handbook, 3rd ed. Boston: Artech House, 2018.
6. John Volakis, Antenna Engineering Handbook, 5th ed. New York: McGraw-Hill Education, 2018.
7. O.G. Pliushch, “Gradient Signal Processing Algorithm for Adaptive Antenna Arrays Obviating Reference Signal Presence,” presented at the IEEE International Scientific-Practical Conference PIC S&T, Kyiv, Ukraine, October 8–11, 2019, Paper 190.