Improved Nearly-MDS Expander Codes

A construction of expander codes is presented with the following three properties: (i) the codes lie close to the Singleton bound, (ii) they can be encoded in time complexity that is linear in their code length, and (iii) they have a lineartime bounded-distance decoder. By using a version of the decoder that corrects also erasures, the codes can replace MDS outer codes in concatenated constructions, thus resulting in lineartime encodable and decodable codes that approach the Zyablov bound or the capacity of memoryless channels. The presented construction improves on an earlier result by Guruswami and Indyk in that any rate and relative minimum distance that lies below the Singleton bound is attainable for a significantly smaller alphabet size.

• Type: Journal
• Year: 2006
• Where: CORR
• Authors: Ron M. Roth, Vitaly Skachek
• Keywords: CORR 2006, Education, Lineartime Bounded-distance Decoder, MDS Outer Codes, Time Complexity