Title :
A new Luby transform based wireless broadcast system
Author :
Rajanasree, U. ; Lakshmi, V.S.
Author_Institution :
Electron. & Commun. Eng., SCT Coll. of Eng., Trivandrum, India
Abstract :
Luby Transform (LT) codes are the first realization of a class of erasure codes, usually known as universal erasure codes. LT codes were originally designed for Binary Erasure Channel (BEC), but for the sake of transmitting data reliably over the wireless broadcast channels, LT codes have to be combined with classical channel codes. This paper proposes a new model for LT code based wireless broadcast system by concatenating LT codes with Shannon-limit approaching LDPC codes. The normal Hard decoding scheme of LT codes is replaced with HSHD scheme and iterative channel estimation and decoding is used for LDPC codes. Simulation results show that the iterative channel estimation and decoding combined with HSHD outperforms the other decoding schemes in terms of BER.
Keywords :
broadcast channels; channel estimation; concatenated codes; iterative decoding; parity check codes; transform coding; wireless channels; BEC codes; BER; HSHD scheme; LT codes; Luby transform codes; Shannon-limit approaching LDPC codes; binary erasure channel; erasure codes class; hard decoding scheme; hybrid soft and hard decision decoding; iterative channel estimation; wireless broadcast system; AWGN channels; Channel estimation; Decoding; Iterative decoding; Receivers; Wireless communication; BP decoding; HSHD scheme; LDPC codes; Luby Transform;
Conference_Titel :
Computational Systems and Communications (ICCSC), 2014 First International Conference on
Conference_Location :
Trivandrum
Print_ISBN :
978-1-4799-6012-5
DOI :
10.1109/COMPSC.2014.7032622
