Title :
Rate-Compatible Protograph-Based LDPC Codes for Inter-Symbol Interference Channels
Author :
Thuy Van Nguyen ; Nosratinia, Aria ; Divsalar, Dariush
Author_Institution :
Dept. of Electr. Eng., Univ. of Texas at Dallas, Richardson, TX, USA
Abstract :
This letter produces a family of rate-compatible protograph-based LDPC codes approaching the independent and uniformly distributed (i.u.d.) capacity of inter-symbol interference (ISI) channels. This problem is highly nontrivial due to the joint design of structured (protograph-based) LDPC codes and the state structure of ISI channels. We describe a method to design nested high-rate protograph codes by adding variable nodes to the protograph of a lower rate code. We then design a family of rate-compatible protograph codes using the extension method. The resulting protograph codes have iterative decoding thresholds close to the i.u.d. capacity. Our results are supported by numerical simulations.
Keywords :
channel capacity; intersymbol interference; iterative decoding; numerical analysis; parity check codes; ISI channels; extension method; i.u.d. capacity; independent and uniformly distributed capacity; inter-symbol interference channels; iterative decoding thresholds; lower rate code; nested high-rate protograph codes; numerical simulations; rate-compatible protograph-based LDPC codes; state structure; structured LDPC codes; Design methodology; Encoding; Iterative decoding; Joining processes; Partial response channels; Payloads; LPDC; inter-symbol interference; protograph; rate-compatible;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2013.060513.130498
