New York: Springer-Verlag, Stepanov, S.
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Codes on Algebraic Curves. New York: Kluwer, Vermani, L. Elements of Algebraic Coding Theory.
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An Introduction to Coding Theory, 2nd ed. Weisstein, E.
Weisstein, Eric W. Explore thousands of free applications across science, mathematics, engineering, technology, business, art, finance, social sciences, and more.
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There are simplifications to reduce the computational load. They rely on searching only the most likely paths. Although not optimum, they have generally been found to give good results in low noise environments. Convolutional codes are used in voiceband modems V.
Cryptography or cryptographic coding is the practice and study of techniques for secure communication in the presence of third parties called adversaries. Modern cryptography exists at the intersection of the disciplines of mathematics , computer science , and electrical engineering. Applications of cryptography include ATM cards , computer passwords , and electronic commerce.
Cryptography prior to the modern age was effectively synonymous with encryption , the conversion of information from a readable state to apparent nonsense. The originator of an encrypted message shared the decoding technique needed to recover the original information only with intended recipients, thereby precluding unwanted persons from doing the same. Modern cryptography is heavily based on mathematical theory and computer science practice; cryptographic algorithms are designed around computational hardness assumptions , making such algorithms hard to break in practice by any adversary.
It is theoretically possible to break such a system, but it is infeasible to do so by any known practical means. These schemes are therefore termed computationally secure; theoretical advances, e. There exist information-theoretically secure schemes that provably cannot be broken even with unlimited computing power—an example is the one-time pad —but these schemes are more difficult to implement than the best theoretically breakable but computationally secure mechanisms.
A line code also called digital baseband modulation or digital baseband transmission method is a code chosen for use within a communications system for baseband transmission purposes.
NSF Award Search: Award# - Problems in Algebraic Coding Theory
Line coding is often used for digital data transport. Line coding consists of representing the digital signal to be transported by an amplitude- and time-discrete signal that is optimally tuned for the specific properties of the physical channel and of the receiving equipment. The waveform pattern of voltage or current used to represent the 1s and 0s of a digital data on a transmission link is called line encoding. The common types of line encoding are unipolar , polar , bipolar , and Manchester encoding. Another concern of coding theory is designing codes that help synchronization.
A code may be designed so that a phase shift can be easily detected and corrected and that multiple signals can be sent on the same channel. Another application of codes, used in some mobile phone systems, is code-division multiple access CDMA. Each phone is assigned a code sequence that is approximately uncorrelated with the codes of other phones. At the receiver, a demodulation process is performed to recover the data.
The properties of this class of codes allow many users with different codes to use the same radio channel at the same time. To the receiver, the signals of other users will appear to the demodulator only as a low-level noise. Another general class of codes are the automatic repeat-request ARQ codes. In these codes the sender adds redundancy to each message for error checking, usually by adding check bits. If the check bits are not consistent with the rest of the message when it arrives, the receiver will ask the sender to retransmit the message.
All but the simplest wide area network protocols use ARQ. There is an extensive field of research on this topic because of the problem of matching a rejected packet against a new packet.
Algebraic Coding Theory
Is it a new one or is it a retransmission? Typically numbering schemes are used, as in TCP. September Group testing uses codes in a different way. Consider a large group of items in which a very few are different in a particular way e. The idea of group testing is to determine which items are "different" by using as few tests as possible. Information is encoded analogously in the neural networks of brains , in analog signal processing , and analog electronics.
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Aspects of analog coding include analog error correction,  analog data compression  and analog encryption. Neural coding is a neuroscience -related field concerned with how sensory and other information is represented in the brain by networks of neurons. The main goal of studying neural coding is to characterize the relationship between the stimulus and the individual or ensemble neuronal responses and the relationship among electrical activity of the neurons in the ensemble.
From Wikipedia, the free encyclopedia. Main article: Data compression. Main article: Error detection and correction. Main article: Linear code. Main article: Block code. Main article: Convolutional code. Main article: Cryptography. Main article: Line code. This article or section may contain misleading parts. Please help clarify this article according to any suggestions provided on the talk page. August Telecommunication portal.
Data Communications and Networks. Digital Signal Processing, Vol. Fourier Analysis on Finite Groups and Applications. Cambridge University Press.
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