vestiftИзвестия Национальной академии наук Беларуси. Серия физико-технических наукProceedings of the National Academy of Sciences of Belarus. Physical-technical series1561-83582524-244XThe Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"10.29235/1561-8358-2019-64-3-332-346vestift-457Research ArticleРАДИОЭЛЕКТРОНИКА И ПРИБОРОСТРОЕНИЕRADIOELECTRONICS AND INSTRUMENT-MAKINGПространственно-временное разнесение сигналов в системах с широкополосным множественным доступом и кодовым разделением каналовSpace-time diversity signal processing employed by W-CDMA systemsТузлуковВ. П.TuzlukovV. P.

Тузлуков Вячеслав Петрович – доктор физико-математических наук, профессор, заведующий кафедрой технической эксплуатации авиационного и радиоэлектронного оборудования

ул. Уборевича, 77, 220096, Минск

Vyacheslav P. Tuzlukov – D. Sc. (Physics and Mathematics), Professor, Head of the Department of Technical Maintenance of Aviation and Radio Electronic Equipment

77, Uborevich Str., 220096, Minsk

slava.tuzlukov@mail.ruБелорусская государственная академия авиацииBelarussian State Aviation Academy201905102019643332346Copyright © Тузлуков В.П., 20192019Тузлуков В.П.Tuzlukov V.P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestift.belnauka.by/jour/article/view/457

Разнесение сигналов, передаваемых от базовой станции (центра управления полетом) к мобильной станции или летательному аппарату, например беспилотнику, используя систему с множественным доступом и кодовым разделением каналов, предоставляет возможность получать такую же вероятность ошибки на бит, как и в случае разнесенного приема сигналов без усложнения структуры антенной решетки приемной антенны летательного аппарата. Предварительное кодирование совместно с предварительной фильтрацией передаваемых сигналов с учетом знания информации о параметрах канала связи c многолучевым излучением передаваемого сигнала, порождающим замирания, выполняемое передающим устройством базовой станции, может применяться для обеспечения многолучевого распространения передаваемого сигнала без необходимости использования многоканального приемного устройства для разнесенных сигналов бортовой аппаратурой летательного аппарата. Мы изучаем возможность реализации нескольких методов разнесения сигналов, передаваемых от центра управления полетом к летательному аппарату, используя систему с широкополосным множественным доступом и кодовым разделением каналов. Мы также исследуем оптимальный метод для сочетания разнесения передаваемых сигналов и предварительного кодирования, который дает возможность получить вероятность ошибки на бит очень близкую к оптимальной вероятности ошибки на бит при оптимальном сложении разнесенных сигналов по всем пространственным и частотным каналам разнесенного приема. Мы используем алгоритм долгосрочного прогнозирования параметров канала связи с целью адаптации рассматриваемых методов к условиям быстрого изменения во времени параметров канала связи с замираниями при многолучевом излучении передаваемых сигналов.

Transmit diversity under transmission of signals from the base station to mobile station using the code-division multiple-access (CDMA) system allows us obtaining the performance gains close to the mobile station receiver diversity without complexity of the mobile station receiver antenna array. The multipath diversity can be achieved using the pre-RAKE precoding at the transmitter that could be employed and there is no need to install the RAKE receiver at the mobile station. We investigate several transmitter diversity techniques employed by wideband CDMA (W-CDMA) systems. We also study a possibility to combine transmitter diversity and precoding that achieves the gain of maximum ratio combining of all space and frequency diversity branches jointly with long-term prediction algorithm. It was demonstrated that the performance of the space-time pre-RAKE method approaches the performance of the maximum ratio combining for all space and frequency diversity branches. It is shown that all closed loop methods depend on the long range prediction to approximate the ideal performance in the fast fading environment.

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The authors declare that there are no conflicts of interest present.