Double-well trap for charged microparticles

We propose a double-well linear Paul trap for particle’s spatial selection according to the charge-to-mass ratio. To perform spatial selection we implemented an experimental setup that permits to detect particles’ positions in the double-well trap from three different view-points: top, front left, and front right. The setup gives an opportunity to monitor the particles’ axial density distribution in real-time. We have shown a strong correlation between axial position of separated localization areas and the DC voltages applied to the rod and end-cap electrodes. We have experimentally determined the critical localization parameters where double-well mode acquires for all the trapped charged microparticles. According to the experimental data and a numerical simulation a upper value of charge-to-mass ratio of the trapped microparticles was estimated.

SYNCHRONIZATION OF THE OFDM MODEM WITH THE ANTENNA ARRAY IN HIGH-POWER INTERFERENCE CONDITIONS

The article proposes a method of time-frequency synchronization of an OFDM mo-dem, the input of which receives signals from the elements of the antenna array. The method is based on the combined action of correlation procedures for entering into communication and spatial selection, which clears the signal from interference based on the criterion of the minimum difference between the received signal and the test combination.

HANDOVER ALGORITHM OF THE MCWILL SYSTEM IN THE MODE OF RADIO CHANNEL RESOURCE ALLOCATION CONFLICT ELIMINATION

Рассмотрен режим хэндовера системы МАКВИЛ, предназначенный для устранения конфликтов распределения ресурсов радиоканала и ориентированный на пространственную селекцию радиосигналов абонентов соседних базовых станций (БС), осуществляемую 8-элементными адаптивными антенными решетками (ААР). Представлен алгоритм управления ААР БС, направленный на ликвидацию конфликтов при максимальных нагрузках. Приведено описание алгоритма пространственной селекции, ориентированного на условия возможного отсутствия трасс прямой видимости и, как следствие, произвольных законов амплитудно-фазовых распределений полей на антеннах. Установлена численная связь между энергетическим запасом на краях зон обслуживания и эквивалентным угловым расстоянием между абонентами, достаточным для бесконфликтного пространственного разделения одинаковых спектрально-временных ресурсов. Показано, что ввод управляемого параметра задержки в режиме синхронизации позволит реализовать в МАКВИЛ пространственное разделение абонентов, обслуживаемых одной БС. The McWiLL system handover mode, designed to eliminate conflicts in the distribution of radio channel resources, focused on the spatial selection of radio signals of subscribers of neighboring base stations, carried out by 8-element adaptive antenna arrays, is considered. An algorithm for controlling the adaptive antenna arrays of base stations, focused on eliminating conflicts at maximum loads, is described. The description of the spatial selection algorithm, focused on conditions of the possible absence of line-of-sight traces and, as a result, arbitrary laws of the amplitude-phase distributions of the fields on antennas, is given. A numerical relationship is established between the energy reserve at the edges of the service areas and the equivalent angular distance between subscribers, sufficient for conflict-free spatial separation of identical spectral-time resources. It is shown that the input of a controlled delay parameter in the synchronization mode will allow the implementation of spatial separation of subscribers served by a single base station in the McWiLL system.