A low-complexity joint noncoherent demodulation/decoding algorithm for nonbinary LDPC-coded differential modulation systems

Author

Minghua Li ; Rongting Chen ; Baoming Bai ; Xiao Ma

Author_Institution

State Key Lab. of ISN, Xidian Univ., Xi´an, China

fYear

2013

fDate

6-10 July 2013

Firstpage

403

Lastpage

407

Abstract

In this paper, we apply q-ary LDPC codes to differential modulation systems, and study the design and performance of the resultant coded modulation systems. A low-complexity joint detection/decoding method for noncoherent demodulation is proposed, in which the hard-message-passing strategy is used for a joint factor graph. It combines trellis-based differential detection aided with channel prediction and the reliability-based decoding of nonbinary LDPC codes introduced in [1]. The Max-Log-MAP algorithm with soft-in hard-out is used for the differential detection. Simulation results show that the proposed method can offer good performances with a greatly reduced complexity.

Keywords

decoding; demodulation; maximum likelihood estimation; message passing; parity check codes; trellis coded modulation; channel prediction; hard-message-passing strategy; low-complexity joint noncoherent demodulation-decoding algorithm; max-log-MAP algorithm; nonbinary LDPC-coded differential modulation systems; q-ary LDPC codes; reliability-based decoding; soft-in hard-out; trellis-based differential detection; Complexity theory; Decoding; Demodulation; Iterative decoding; Joints;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal and Information Processing (ChinaSIP), 2013 IEEE China Summit & International Conference on

Conference_Location

Beijing

Type

conf

DOI

10.1109/ChinaSIP.2013.6625370

Filename

6625370