Error floor analysis for an ensemble of easily implementable irregular (2048, 1024) LDPC codes

The following paper describes a design process for constructing semirandom LDPC codes with characteristics that are suitable for a relatively simple implementation for both the encoding and decoding operation. The paper will focus on two particular code ensembles - both rate-1/2 (2048, 1024) designs with a specified irregular degree distribution. These code parameters were chosen simply because they satisfied a project design constraint, but the process described can be extended to most other low-density designs. Some new insights into the codepsilas performance curve behavior in the low error region under message passing decoding are presented.