Title :
Construction of Short Block Length IRA Codes Based on Modified IPEG Algorithm
Author :
Hu, Junfeng ; Zhang, Hailin
Author_Institution :
State Key Lab. of ISN, Xidian Univ., Xi´´an
Abstract :
Based on the particular structure of irregular repeat-accumulate (IRA) codes, a weight function is given for codeword weight computing. Then, we propose a modification to the improved progressive-edge-growth (IPEG) algorithm. The modified IPEG algorithm gives degree-2 variable nodes more protection and tries to avoid low weight code-words corresponding to weight-one and weight-two encoder inputs. Simulation results show that the proposed algorithm improves the performance of short block length IRA codes at high signal-to-noise ratio (SNR) region with no sacrifice in low-SNR performance.
Keywords :
block codes; parity check codes; codeword weight computing; improved progressive-edge-growth algorithm; irregular repeat-accumulate codes; modified IPEG algorithm; short block length IRA codes; signal-to-noise ratio; Computational modeling; Delay; Encoding; Floors; Iterative decoding; Parity check codes; Protection; Signal to noise ratio; Sparse matrices; Wireless communication;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2008. WiCOM '08. 4th International Conference on
Conference_Location :
Dalian
Print_ISBN :
978-1-4244-2107-7
Electronic_ISBN :
978-1-4244-2108-4
DOI :
10.1109/WiCom.2008.344
