CASPIAN JOURNAL

MANAGEMENT AND HIGH TECHNOLOGIES

Internal modification of convolutional codes in communication systems with diversity

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Sinitsin Dmitriy V. Internal modification of convolutional codes in communication systems with diversity // Caspian journal : management and high technologies. — 2014. — №3. — pp. 108-118.

Sinitsin Dmitriy V. - postgraduate student, Vladimir State University named after Alexander and Nikolay Stoletovs, 87 Gorky St., Vladimir, 600000, Russian Federation, Dimonych_taran@mail.ru

Convolutional codes and different methods of diversity are simultaneously used today for information transferring. Especially it is interesting in adaptation of convolutional codes in communication systems, using diversity, including frequency and space diversity. For frequency diversity one of the code symbols is transferred in one of the frequency-diverse channels, and other symbol - in other channel and then this symbols are separately demodulated and enter to decoder. For space diversity first code symbol corresponds vertically - polarized wave, second code symbol - horizontally - polarized wave are developed. Efficiency of these methods are estimated with using computer modeling. Some graphics were obtained. Also method of adaptation for system with feedback, which used quad bridges for management of signals on transfer side, is developed. Some ways of technical implementation of this methods are described.

Key words: прием-передача информации, сверточное кодирование, частотное разнесение, пространственное разнесение, поляризационное разнесение, система с обратной связью, отношение «сигнал/шум», квадратурный мост, receive - transmit of information, convolutional coding