A Course in Error-Correcting Codes (EMS Textbooks in by Jørn Justesen and Tom Høholdt PDF

By Jørn Justesen and Tom Høholdt

This booklet is written as a textual content for a path aimed toward complex undergraduates. just some familiarity with user-friendly linear algebra and likelihood is without delay assumed, yet a few adulthood is needed. the scholars might focus on discrete arithmetic, desktop technological know-how, or conversation engineering. The booklet can be an appropriate creation to coding conception for researchers from similar fields or for execs who are looking to complement their theoretical foundation. It provides the coding fundamentals for engaged on tasks in any of the above components, yet fabric particular to at least one of those fields has now not been incorporated. Chapters disguise the codes and interpreting equipment which are at the moment of so much curiosity in examine, improvement, and alertness. they provide a comparatively short presentation of the basic effects, emphasizing the interrelations among diverse equipment and proofs of all vital effects. a chain of difficulties on the finish of every bankruptcy serves to study the implications and provides the scholar an appreciation of the innovations. additionally, a few difficulties and recommendations for initiatives point out path for additional paintings. The presentation encourages using programming instruments for learning codes, imposing deciphering tools, and simulating functionality. particular examples of programming workout are supplied at the book's domestic web page. disbursed in the Americas through the yankee Mathematical Society.

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Extra resources for A Course in Error-Correcting Codes (EMS Textbooks in Mathematics)

Example text

1. I (X; Y ) = H (Y ) − H (Y |X) = H (X) − H (X|Y ). This follows immediately from the definition and is a convenient way of calculating I . 2). The term H (Y |X) can be found from the transition probabilities of the channel, and H (Y ) is found from the output distribution, which is obtained by multiplying the input distribution by the transition matrix. To use the second form we need to calculate H (X|Y ) from the reverse transition probabilities. 2. The capacity of a discrete channel, C(Y |X) is the maximum of I with respect to P(X).

Actually even an error pattern of weight d2 may be equally close to the zero word and to several nonzero words, but that usually happens only in relatively few cases. 7) we do not specify the value of the error patterns outside the w positions under consideration. Thus if there are several errors in other positions, it is more likely that the vector is also close to another codeword, and vectors of high weight are clearly counted many times (but of course they have small probability). We can get a better bound by keeping track of the weight of the entire error pattern.

The finite field F16 The polynomial x 4 + x + 1 ∈ F2 [x] is irreducible and can therefore be used to construct F16 . The elements are the binary 4-tuples : (0, 0, 0, 0) . . (1, 1, 1, 1). These can also be considered as all binary polynomials of degree at most 3. If we calculate the powers of (0, 1, 0, 0) which corresponds to the polynomial x we get: x 0 = 1 , x 1 = x, x 2 = x 2 , x 3 = x 3 , x 4 = x + 1, x 5 = x 2 + x, x 6 = x 3 + x 2 , x 7 = x 3 + x + 1, x 8 = x 2 + 1, x 9 = x 3 + x, x 10 = x 2 + x + 1, x 11 = x 3 + x 2 + x, x 12 = x 3 + x 2 + x + 1, x 13 = x 3 + x 2 + 1, x 14 = x 3 + 1, x 15 = 1.

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