Detector of Free Parts of Radio Frequency Spectrum

 
Zhmylev V. (MIET)
 
Abstract - This article presents hardware and software, with the help of which it is possible to establish communication sessions on temporarily free parts of the radio frequency spectrum. The efficiency of radio frequency spectrum can be improved by using temporarily free parts of the spectrum. Using temporarily free parts of the spectrum also allows to increase noise immunity, for example, working in FHSS (frequency-hopping spread spectrum) mode, etc. Working on a secondary basis, primary users should not be disrupted. For the organization of secondary communication networks it is necessary to implement the detector of free parts of radio frequency spectrum. The decision on a condition of the channel is made, by comparison of a threshold and average energy of the channel. Basis for statistically reliable determination of threshold value is the histogram of energy. The histogram represents experimentally measured density of distribution of average energy in the channel for all channels in all range of frequencies. In this article are presented requirements for the detector. There are many variants of the hardware. Methods of analysis are considered. The algorithm of forming a histogram of average energy and the algorithm for determining the threshold value are described in detail.

Keywords - software defined radio, cognitive radio, secondary communication networks, concept of secondary users, energy detector, analyzer of ether.

Детектор свободных участков радиочастотного спектра

 
Жмылев В. (Национальный исследовательский университет «МИЭТ», г. Зеленоград)
 
Аннотация - В статье рассматриваются программно-аппаратные средства, при помощи которых можно устанавливать сеансы связи на временно свободных участках радиочастотного спектра. Представлены требования, предъявляемые к детектору. Предложены различные варианты аппаратных средств. Рассмотрены способы анализа, применяемые на различных аппаратных средствах. Подробно описан алгоритм формирования гистограммы средней энергии, определения порога принятия решения.

Ключевые слова - программно-конфигурируемое радио, когнитивное радио, вторичные сети связи, концепция вторичных пользователей, детектор энергии, анализатор эфира.