Title :
Performance of bilayer-lengthened LDPC codes under joint decoding
Author :
Azmi, Marwan H. ; Yuan, Jinhong
Author_Institution :
Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales, Sydney, NSW, Australia
Abstract :
This paper presents an LDPC code design for decode-and-forward (DF) relay systems. Our design is based on the graphical family of the bilayer-lengthened LDPC codes (BL-LDPC) when joint decoding is performed over the overall expanded graph. To design the BL-LDPC codes under joint decoding, we use the framework of the multi-edge type LDPC (MET-LDPC) codes to represent and optimize the codes. The optimum overall expanded graph of the BL-LDPC codes is found using differential evolution. We demonstrate that a properly designed expanded BL-LDPC code performs asymptotically within 0.1222 dB and 0.10775 dB from the theoretical limits.
Keywords :
graph theory; parity check codes; bilayer-lengthened LDPC codes; decode-and-forward relay systems; differential evolution; joint decoding; optimum overall expanded graph; Australia; Channel capacity; Conferences; Decoding; Design optimization; Diversity methods; Information theory; Parity check codes; Protocols; Relays;
Conference_Titel :
Information Theory Workshop, 2009. ITW 2009. IEEE
Conference_Location :
Taormina
Print_ISBN :
978-1-4244-4982-8
Electronic_ISBN :
978-1-4244-4983-5
DOI :
10.1109/ITW.2009.5351172
