Multilevel LDPC codes design for multimedia communication CDMA system
EURASIP Journal on Wireless Communications and Networking - Special issue on innovative signal transmission and detection techniques for next generation cellular CDMA systems
Bit-Interleaved Coded Modulation
Foundations and Trends in Communications and Information Theory
Performance Bound for Finite-Length LDPC Coded Modulation
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Gallager's decoding algorithm A over high order modulations
IEEE Communications Letters
Low-complexity coded-modulation for ISI-constrained channels
IEEE Transactions on Communications
Disjoint LDPC coding for Gaussian broadcast channels
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 2
An iterative decoding method based on Gaussian approximation for ldpc coded modulations
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Density evolution for nonbinary LDPC codes under Gaussian approximation
IEEE Transactions on Information Theory
Design and analysis of non-binary LDPC and IRA modulation codes
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Design of bandwidth-efficient unequal error protection LDPC codes
IEEE Transactions on Communications
Bandwidth-efficient modulation codes based on nonbinary irregular repeat-accumulate codes
IEEE Transactions on Information Theory
Group codes outperform binary-coset codes on nonbinary symmetric memoryless channels
IEEE Transactions on Information Theory
Adaptive modulation and coding schemes based on LDPC codes with irregular modulation
IEEE Transactions on Communications
LDPC code design considerations for non-uniform channels
IEEE Transactions on Communications
Design of nonbinary LDPC codes over GF(q) for multiple-antenna transmission
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
Decoding and Design of LDPC Codes for High-Order Modulations
Wireless Personal Communications: An International Journal
Signal shaping for bit-interleaved coded modulation on the AWGN channel
IEEE Transactions on Communications
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We design multilevel coding (MLC) and bit-interleaved coded modulation (BICM) schemes based on low-density parity-check (LDPC) codes. The analysis and optimization of the LDPC component codes for the MLC and BICM schemes are complicated because, in general, the equivalent binary-input component channels are not necessarily symmetric. To overcome this obstacle, we deploy two different approaches: one based on independent and identically distributed (i.i.d.) channel adapters and the other based on coset codes. By incorporating i.i.d. channel adapters, we can force the symmetry of each binary-input component channel. By considering coset codes, we extend the concentration theorem based on previous work by Richardson et al. ( see ibid., vol.47, p.599-618, Feb. 2001) and Kavcˇic´ et al.(see ibid., vol.49, p.1636-52, July 2003) We also discuss the relation between the systems based on the two approaches and show that they indeed have the same expected decoder behavior. Next, we jointly optimize the code rates and degree distribution pairs of the LDPC component codes for the MLC scheme. The optimized irregular LDPC codes at each level of MLC with multistage decoding (MSD) are able to perform well at signal-to-noise ratios (SNR) very close to the capacity of the additive white Gaussian noise (AWGN) channel. We also show that the optimized BICM scheme can approach the parallel independent decoding (PID) capacity as closely as does the MLC/PID scheme. Simulations with very large codeword length verify the accuracy of the analytical results. Finally, we compare the simulated performance of these coded modulation schemes at finite codeword lengths, and consider the results from the perspective of a random coding exponent analysis.