ADI-code ( English Alternate digit inversion code - “Code with bitwise alternating inversion” [1] ) is one of the methods of linear coding [2] ( physical coding , channel coding, digital coding, signal manipulation [3] , pulse code modulation [4] ). Encoding is used to transmit data at a distance from the transmitter to the receiver via a communication channel, for example, over fiber. It is a bipolar, two-level code, in which the polarity of the signal at the output of the encoder is inverted on every second repetitive binary digit [1] . With synchronous data transmission, there are situations when the transmitter and receiver are out of sync, which leads to transmission errors of the bit sequence. Digital transmission systems use transmitter and receiver synchronization techniques in the process of data transmission by inputting a bit deterministic sequence, but this sequence is redundant , but to avoid redundancy, special linear coding is used, which avoids receiver out-of-sync with the transmitter, due to the fact that the receiver will be synchronize at times when the signal state changes (a transition from one energy level to another occurs). When using ADI coding, a signal is generated during data transmission, which increases the likelihood of the receiver synchronizing with the transmitter during the signal transmission, because when transmitting a sequence consisting of a long sequence of logical "zeros" or logical "ones", the signal level is inverted [ 1] .
Content
Benefits
- Issues of disrupting receiver and transmitter synchronization are resolved when there is a long sequence in the data consisting of logical “zeros” or “ones”;
- Ease with digital implementation.
Disadvantages
- Not self-synchronizing code
Application
- In fiber optic communication lines
See also
- Linear coding
- Channel coding
- Physical coding
- Manchester II
- NRZ (straight)
- PAM-5
- MLT-3
- 4B3T
- Rz
- AMI
- Miller Code
- Manipulation
Notes
- ↑ 1 2 3 Slepov N.N. Synchronous digital networks SDH. - M .: Eco-Trend, 1998. - 148 p. - ISBN 5-88405-002-X .
- ↑ Berlin A.N. Switching in communication systems and networks. - M .: Eco-trend, 2006. - 344 p. - ISBN 5-88405-073-9 .
- ↑ Sergienko A. B. Digital signal processing. - SPb. : Peter, 2002. - 608 p. - ISBN 5-318-00666-3 .
- ↑ Dunsmore, Brad, Scander, Toby. Handbook of telecommunication technologies. - Williams, 2004. - 640 p. - ISBN 5-8459-0562-1 .
Literature
- Patel, Arvind Motibhai (1988). "five. Signal and Error-Control Coding. In Mee, C. Denis; Daniel, Eric D. Magnetic Recording. II: Computer Data Storage (1st ed.). McGraw-Hill Book Company. ISBN 0-07-041272-3 .
- Goldstein Boris Solomonovich. Access network protocols. - BHV-Petersburg. - 2005.
- Transfer of discrete messages: Textbook for universities / V.P. Shuvalov, N.V. Zakharchenko, V.O. Shvartsman et al .; Ed. V.P. Shuvalov. - M .: Radio and communication, —1990—464 ISBN 5-256-00852-8
- Slepov N. N. Synchronous digital networks SDH. - M .: Eco-Trend, −1998, 148c. ISBN - 5-88405-002-X
- Grahame Smillie. Analogue and Digital Communication Techniques. - 1999. pp. - 312. ISBN 978-0-340-73125-3