Title :
Protograph-based Raptor-like LDPC codes with low thresholds
Author :
Chen, Tsung-Yi ; Divsalar, Dariush ; Wesel, Richard D.
Author_Institution :
Dept. of Electr. Eng., Univ. of California, Los Angeles, Los Angeles, CA, USA
Abstract :
This paper presents a new construction of punctured-node protograph-based Raptor-like (PN-PBRL) codes that is suitable for long-blocklength applications. As with the Raptor codes, additional parity bits can be easily produced by exclusive-OR operations on the precoded bits, providing extensive rate compatibility. The new construction provides low iterative decoding thresholds that are within 0.45 dB of the capacity for all code rates studied, and the construction is suitable for long blocklengths. Comparing at the same information block size of k = 16368 bits, the PN-PBRL codes are as good as the best known AR4JA codes in the waterfall region. The PN-PBRL codes also perform comparably to DVB-S2 LDPC codes even though the DVBi-S2 codes have longer blocklength and outer BCH codes.
Keywords :
block codes; iterative decoding; parity check codes; AR4JA codes; DVB-S2 LDPC codes; DVBi-S2 codes; PN-PBRL codes; exclusive-OR operations; extensive rate compatibility; information block size; long-block length applications; low iterative decoding thresholds; outer BCH codes; protograph-based Raptor-like LDPC codes; punctured-node protograph-based Raptor-like codes; waterfall region; word length 16368 bit; Bit error rate; Decoding; Digital video broadcasting; Iterative decoding; Optimization;
Conference_Titel :
Communications (ICC), 2012 IEEE International Conference on
Conference_Location :
Ottawa, ON
Print_ISBN :
978-1-4577-2052-9
Electronic_ISBN :
1550-3607
DOI :
10.1109/ICC.2012.6363996
