Using Short Synchronous WOM Codes to Make WOM Codes Decodable
Journal article, 2014

In the framework of write-once memory (WOM) codes, it is important to distinguish between codes that can be decoded directly and those that require the decoder to know the current generation so as to successfully decode the state of the memory. A widely used approach to constructing WOM codes is to design first nondecodable codes that approach the boundaries of the capacity region and then make them decodable by appending additional cells that store the current generation, at an expense of rate loss. In this paper, we propose an alternative method to making nondecodable WOM codes decodable by appending cells that also store some additional data. The key idea is to append to the original (nondecodable) code a short synchronous WOM code and write generations of the original code and the synchronous code simultaneously. We consider both the binary and the nonbinary case. Furthermore, we propose a construction of synchronous WOM codes, which are then used to make nondecodable codes decodable. For short-to-moderate block lengths, the proposed method significantly reduces the rate loss as compared to the standard method.


Nicolas Bitouzé

Telecom Bretagne

University of California

Alexandre Graell i Amat

Chalmers, Signals and Systems, Communication, Antennas and Optical Networks

Eirik Rosnes

University of Bergen

Ceragon Networks AS

Simula Research Laboratory

IEEE Transactions on Communications

0090-6778 (ISSN) 15580857 (eISSN)

Vol. 62 7 2156-2169 6815644

Signal Recovery: Compressed Sensing meets Coding Theory

Swedish Research Council (VR) (2011-5961), 2012-01-01 -- 2015-12-31.

Areas of Advance

Information and Communication Technology

Subject Categories

Communication Systems



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9/6/2018 1