Abstract
The physical and logical organization of most existing communication systems provides for additional options (transmission of known preambles, the presence of an additional synchronization channel) that simplify synchronization. At the same time, in the practical implementation of radio communication systems, it is necessary to solve the problems of developing additional synchronization mechanisms that can reduce the time it takes to synchronize to reduce energy consumption and increase channel capacity. Thus, the existing problem of the asynchrony of the generators of physically remote radio stations is relevant. One of the possible solutions is asynchronous signal reception with the direct sequence spread spectrum. It allows converting the original binary signal into a pseudo-random sequence for modulating the carrier. The current article is devoted to the characterization of this method and has the following items presented: the transmitter and receiver block diagram, sufficient to explain the proposed method; methods for compensating for effects arising from the asynchrony of the transmitter and receiver generators. Since synchronization is generated according to the correlation peaks that correspond to the data bits, it is possible to set the frequency of the chips on the transmitter to jitter artificially and supplement the pseudo-random sequence with several random chips, which complicates the unauthorized detection of the transmitted signal.
Highlights
The physical and logical organization of most existing communication systems provides for additional options that simplify synchronization
In the practical implementation of radio communication systems, it is necessary to solve the problems of developing additional synchronization mechanisms that can reduce the time it takes to synchronize to reduce energy consumption and increase channel capacity
The current article is devoted to the characterization of this method and has the following items presented: the transmitter and receiver block diagram, sufficient to explain the proposed method; methods for compensating for effects arising from the asynchrony of the transmitter and receiver generators
Summary
Физическая и логическая организация большинства существующих систем связи предусматривает наличие дополнительных опций (передача известных преамбул, наличие дополнительного канала синхронизации), упрощающих синхронизацию. При практической реализации систем радиосвязи необходимо решение задач разработки дополнительных синхронизационных механизмов, способных сократить время вхождения в синхронизм для уменьшения расхода энергии и увеличения пропускной способности канала. Существующая проблема асинхронности генераторов физически удаленных радиостанций является актуальной. Одним из возможных вариантов ее решения является асинхронный прием сигналов с прямым расширением спектра, позволяющим преобразовывать исходный двоичный сигнал в псевдослучайную последовательность для модуляции несущей. Характеристике данного метода посвящена статья, в которой представлены: структурная схема передатчика и приемника, достаточная для пояснения предлагаемого метода; методы компенсации эффектов, возникающих из-за асинхронности генераторов передатчика и приемника. Ключевые слова: системы радиосвязи, прямое расширение спектра, двоичный сигнал, асинхронный прием сигналов. В. Применение метода асинхронного приема сигналов с прямым расширением спектра // Радиопромышленность.
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