Optimized Concatenated LDPC Codes for Joint Source-Channel Coding
Maria Fresia, Fernando Perez-Cruz and Vicent Poor
In: IEEE ISIT, July, Seoul Korea.
In this paper a scheme for joint source-channel
coding based on LDPC codes is investigated. Two concatenated
independent LDPC codes are used in the transmitter:
one for source and the other for channel coding, with joint
belief propagation decoder. The asymptotic behavior is analyzed
using EXtrinsic Information Transfer (EXIT) charts and this
approximation is corroborated with illustrative experiments. The
optimization of the degree distributions for our sparse code to
maximize the information transmission rate is also considered.