Institute of Electrical & Electronic Engineers
A practical approach to designing Distributed Joint Source Channel (DJSC) codes for correlated binary sources using LDPC codes is presented. In this approach, both distributed compression and channel error protection are achieved by optimally puncturing bits of a systematic channel code to match the source correlation and channel error probability. This requires the design of a channel code with a specific Unequal Error Protection (UEP) property. Towards this end, the authors present a linear-programming based algorithm for optimizing an irregular LDPC code for a given level of source correlation and channel noise.