A practical joint network-channel coding scheme for reliable communication in wireless networks
Proceedings of the tenth ACM international symposium on Mobile ad hoc networking and computing
Performance analysis of LDPC codes over shallow water acoustic channels
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Performance analysis of IRA codes for underwater acoustic OFDM communication system
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
IEEE Transactions on Signal Processing
Near-Shannon-limit linear-time-encodable nonbinary irregular LDPC codes
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
An OFDM based MAC protocol for underwater acoustic networks
Proceedings of the Fifth ACM International Workshop on UnderWater Networks
Iterative sparse channel estimation and decoding for underwater MIMO-OFDM
EURASIP Journal on Advances in Signal Processing - Special issue on advanced equalization techniques for wireless communications
Large-girth nonbinary QC-LDPC codes of various lengths
IEEE Transactions on Communications
Proceedings of the Sixth ACM International Workshop on Underwater Networks
Performance comparison of doppler scale estimation methods for underwater acoustic OFDM
Journal of Electrical and Computer Engineering - Special issue on Underwater Communications and Networking
CT-MAC: a MAC protocol for underwater MIMO based network uplink communications
Proceedings of the Seventh ACM International Conference on Underwater Networks and Systems
A nonbinary LDPC decoder architecture with adaptive message control
IEEE Transactions on Very Large Scale Integration (VLSI) Systems
Joint DFE with LDPC decoding for anti-multipath over underwater acoustic channels
Proceedings of the Eighth ACM International Conference on Underwater Networks and Systems
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Recently, multicarrier modulation in the form of orthogonal frequency division multiplexing (OFDM) has been shown feasible for underwater acoustic communications via effective algorithms to handle the channel time-variability. In this paper, we propose to use nonbinary low density parity check (LDPC) codes to address two other main issues in OFDM: (i) plain (or uncoded) OFDM has poor performance in fading channels, and (ii) OFDM transmission has high peak to average power ratio (PAPR). We develop new methods to construct nonbinary regular and irregular LDPC codes that achieve excellent performance, match well with the underlying modulation, and can be encoded in linear time and in a parallel fashion. Based on the fact that the generator matrix of LDPC codes has high density, we further show how to reduce the PAPR considerably with minimal overhead. Experimental results confirm the excellent performance of the proposed nonbinary LDPC codes in multicarrier underwater acoustic communications.