Alon, Noga and Bruck, Jehoshua and Naor, Joseph and Naor, Moni and Roth, Ron M. (1992) Construction of asymptotically good low-rate error-correcting codes through pseudo-random graphs. IEEE Transactions on Information Theory, 38 (2). pp. 509-516. ISSN 0018-9448 http://resolver.caltech.edu/CaltechAUTHORS:ALOieeetit92
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A novel technique, based on the pseudo-random properties of certain graphs known as expanders, is used to obtain novel simple explicit constructions of asymptotically good codes. In one of the constructions, the expanders are used to enhance Justesen codes by replicating, shuffling, and then regrouping the code coordinates. For any fixed (small) rate, and for a sufficiently large alphabet, the codes thus obtained lie above the Zyablov bound. Using these codes as outer codes in a concatenated scheme, a second asymptotic good construction is obtained which applies to small alphabets (say, GF(2)) as well. Although these concatenated codes lie below the Zyablov bound, they are still superior to previously known explicit constructions in the zero-rate neighborhood.
|Additional Information:||© Copyright 1992 IEEE. Reprinted with permission. Manuscript received October 10, 1990. This work was done while N. Alon was on sabbatical from Tel-Aviv University. This work was presented in part at the IEEE International Symposium on Information Theory, Budapest, Hungary, June 24-28, 1991.|
|Subject Keywords:||Expanders, Justesen codes, Zyablov bound, independent sets|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||07 Dec 2006|
|Last Modified:||26 Dec 2012 09:20|
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