Download e-book for iPad: Block Error-Correcting Codes: A Computational Primer by Sebastià Xambó-Descamps

By Sebastià Xambó-Descamps

ISBN-10: 3540003959

ISBN-13: 9783540003953

Error-correcting codes were integrated in different operating verbal exchange and reminiscence platforms. This booklet covers the mathematical facets of the speculation of block error-correcting codes jointly, in mutual reinforcement, with computational discussions, implementations and examples of all proper recommendations, capabilities and algorithms. This mixed technique allows the analyzing and figuring out of the topic. The electronic significant other of the publication is a non-printable .pdf rfile with links. The examples integrated within the e-book should be run with only a mouse click on and transformed and saved by clients for his or her personal goal.

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Example text

It is important to take into account that the norm | | and the scalar product | are not related as in Euclidean geometry. In the geometrical context we have the formula |x|2 = x|x (by definition of |x|), while in the present context |x| and x|x have been defined independently. In fact they are quite unrelated, if only because the values of the norm are non-negative integers and the values of the scalar product are elements of F. 21. Let C be a linear code of type [n, k] over F = Fq . Fix any integer j such that 1 j n.

Now we will see that the Vandermonde matrix H = V1,n−k (α1 , . . , αn ) = (αji ), 1 i n − k, 1 j n, is a check matrix of C. 26, there is a check matrix of C that has the form Vn−k (α1 , . . , αn )diag (h1 , . . , hn ), with hi = 1/ j=i (αj − αi ), and in the present case we have hi = αi (as argued in a moment), so that V1,n−k (α1 , . . , αn ) = Vn−k (α1 , . . , αn )diag (α1 , . . , αn ) is a check matrix of C. To see that hi = αi , first note that j=i (αj − αi ) is the product of all the elements of F∗ , except −αi .

Moreover, since αi = ni for 0 i t, and 1 = ni=0 ni pi (1 − p)n−i , n Pe = 1 − Pc = i=t+1 n − αi pi (1 − p)n−i . i If p is small, the dominant term in this sum can be approximated by n − αt+1 pt+1 t+1 and the error reduction factor by n − αt+1 pt . t+1 In general the integers αi are difficult to accertain for i > t. Incomplete syndrome-leader decoding If asking for retransmission is allowed, sometimes it may be useful to modify the syndrome-leader decoder as follows: If s is the syndrome of the received vector and the leader es has weight at most t, then we return y−es , otherwise we ask for retransmission.

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Block Error-Correcting Codes: A Computational Primer by Sebastià Xambó-Descamps

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