New PDF release: Algebraic Coding Theory

By Elwyn R Berlekamp

ISBN-10: 9814635898

ISBN-13: 9789814635899

This can be the revised variation of Berlekamp's well-known publication, "Algebraic Coding Theory", initially released in 1968, in which he brought a number of algorithms that have therefore ruled engineering perform during this box. this kind of is an set of rules for interpreting Reed-Solomon and Bose–Chaudhuri–Hocquenghem codes that for that reason turned often called the Berlekamp–Massey set of rules. one other is the Berlekamp set of rules for factoring polynomials over finite fields, whose later extensions and gildings grew to become time-honored in symbolic manipulation structures. different novel algorithms better the elemental equipment for doing quite a few mathematics operations in finite fields of attribute . different significant learn contributions during this e-book integrated a brand new type of Lee metric codes, and unique asymptotic effects at the variety of info symbols in lengthy binary BCH codes.

chosen chapters of the publication grew to become a regular graduate textbook.

either working towards engineers and students will locate this publication to be of significant value.

Readership: Researchers in coding conception and cryptography, algebra and quantity conception, and software program engineering.

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Extra info for Algebraic Coding Theory

Sample text

Second, we observe that if there were two different gcd's of r<- 2> and r<- 1>, then each must divide the other. In the domain of integers, this implies uniqueness of the gcd. , an element of F. This nonuniqueness may be removed by normalizing the gcd's to monic polynomials, whose leading coefficients are 1. We can then assert that any two polynomials over F have a unique monic gcd. Iff is a polynomial which has no divisors except scalars and scalar multiples of itself, then f is said to be an irreducible polynomial.

For this reason, the syndrome of any error pattern of weight 2 will be different from any column of the :JC matrix. It is also nonzero. Any pattern of two channel errors must cause a decoding failure. Thus, the extended Hamming codes are able to correct all channel-error patterns of weight ~ 1, and detect all channel-error patterns of weight 2. Although the columns of the :JC matrix of a Hamming code may be arranged in any order, some arrangements lead to much simpler instrumentations than others.

For if we apply the division algorithm to the dividend f(x), using x - ~for the divisor, we shall obtain a quotient q(x) and a remainder r. Since the remainder will have degree smaller than the divisor, the remainder must be a constant, independent of x. 15. obtaining r= f(~), as claimed. From A polynomial of degree d over the field F has at most d roots in any field containing F. 15 Some readers no doubt consider this assertion so obvious as to question the need of any proof of the sort we have just given.

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Algebraic Coding Theory by Elwyn R Berlekamp

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