Radio Channel Capacity with Directivity Control of Antenna Beams in Multipath Propagation Environment

The basic technology that will determine the expansion of the technical capabilities of fifth generation cellular systems is a massive multiple-input-multiple-output. Therefore, assessing the influence of the antenna beam orientations on the radio channel capacity is very significant. In this case, the effects of mismatching the antenna beam directions are crucial. In this paper, the methodology for evaluating changes in the received signal power level due to beam misalignment for the transmitting and receiving antenna systems is presented. The quantitative assessment of this issue is presented based on simulation studies carried out for an exemplary propagation scenario. For non-line-of-sight (NLOS) conditions, it is shown that the optimal selection of the transmitting and receiving beam directions may ensure an increase in the level of the received signal by several decibels in relation to the coaxial position of the beams. The developed methodology makes it possible to analyze changes in the radio channel capacity versus the signal-to-noise ratio and distance between the transmitter and receiver at optimal and coaxial orientations of antenna beams for various propagation scenarios, considering NLOS conditions. In the paper, the influence of the directional antenna use and their direction choices on the channel capacity versus SNR and the distance between the transmitter and receiver is shown.

Formation of the necessary configuration of the detection zone by radar means with superscanning on the example of the port section of Novorossiysk

В статье рассматривается способ применения методов сверхбыстрого сканирования в радиолокационных технических соседствах обнаружения систем охраны объектов транспортной инфраструктуры. В основе предлагаемого подхода использована возможность формирования требуемого ракурса зондирования пространства однопозиционной системой со сверхбыстрым сканированием луча антенны в угловом секторе обзора. Опыт эксплуатации систем охраны показывает, что для обеспечения зон безопасности морских терминалов, гидротехнических сооружений, акваторий морских портов и т.п. существенным является организация пространственных зон контроля. Разработана математическая модель формирования требуемой конфигурации зоны обнаружения радиолокационным средством со сверхсканированием на примере участка порта Новороссийск. Полученные аналитические зависимости законов сверхсканирования позволяют учесть сценарии различных ситуаций нарушения безопасности, по которым тревожными считаются факты появления или движения объектов в запрещённом направлении относительно условно заданных границ контролируемой территории. The article considers a method of applying ultra-fast scanning methods in radar technical neighborhoods for detecting security systems for transport infrastructure objects. The proposed approach is based on the possibility of forming the required perspective of space sensing by a single-position system with ultra-fast scanning of the antenna beam in the angular sector of the view. The experience of operating security systems shows that the organization of spatial control zones is essential for ensuring the security zones of sea terminals, hydraulic structures, seaports, etc. A mathematical model of the formation of the required configuration of the detection zone by radar means with superscanning is developed on the example of the port of Novorossiysk section. The obtained analytical dependences of the laws of superscanning allow us to take into account scenarios of various security violation situations, according to which the facts of the appearance or movement of objects in the prohibited direction relative to the conditionally defined boundaries of the controlled territory are considered alarming.