Title :
Iterative multi-channel equalization and LDPC decoding for underwater acoustic coherent communications
Author :
Zhao, Liang ; Ge, Jianhua
Author_Institution :
State Key Lab. of Integrated Service Networks, Xi´´an, China
Abstract :
Multi-Channel adaptive decision feedback equalizer (MC-ADFE) is a main method to overcome multi-path distortion and eliminate Inter-Symbol Interference (ISI) for underwater acoustic channel. LDPC codes are capacity achieving codes, which can provide considerable coding gain. In this paper, the turbo theory is applied to form iterative multi-channel adaptive decision feedback equalizer (MC-ADFE) and LDPC decoder. In iterative equalization and decoding algorithm (IED), the MC-ADFE and LDPC decoder exchange soft information in an iterative manner, which can enhance the equalizer performance using significant decoding gain. The simulation results show that proposed system scheme can improve the performance of equalizer and get considerable coding gain. So, the performance of underwater acoustic communication system can be improved greatly.
Keywords :
decision feedback equalisers; intersymbol interference; iterative decoding; parity check codes; turbo codes; underwater acoustic communication; IED; ISI; LDPC codes; LDPC decoding; MC-ADFE; intersymbol interference; iterative equalization-and-decoding; iterative multichannel equalization; multichannel adaptive decision feedback equalizer; multipath distortion; turbo theory; underwater acoustic channel; underwater acoustic coherent communication; Decision feedback equalizers; Decoding; Estimation; Iterative decoding; Underwater acoustics; Iterative equalization and decoding (IED); LDPC codes; Underwater Acoustic Coherent Communications;
Conference_Titel :
Information Theory and Information Security (ICITIS), 2010 IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-6942-0
DOI :
10.1109/ICITIS.2010.5689737
