Construction of Multiple Access Channel Codes Based on Hash Property
  The aim of this paper is to introduce the construction of codes for a general discrete stationary memoryless multiple access channel based on the the notion of the hash property. Since an ensemble of sparse matrices has a hash property, we can use sparse matrices for code construction. Our approach has a potential advantage compared to the conventional random coding because it is expected that we can use some approximation algorithms by using the sparse structure of codes. 
Jun Muramatsu and Shigeki Miyake
cs.IT math.IT