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Title: Iterative decoding of multilevel coded modulation
Author: Wang, Yi
ISNI:       0000 0004 2716 9877
Awarding Body: University of York
Current Institution: University of York
Date of Award: 2011
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Multilevel coded modulation, initially proposed by Imai and Hirakawa in 1977, is a powerful bandwidth efficient coded modulation technique, where different-rate codes are employed to protect each level of the mapping. Later, multilevel coded modulation in conjunction with iter- ative decoding (MLCM-ID) was developed by Isaka and Imai in 2001, in order to significantly compensate the suboptimality of the non-iteration multi stage decoding. MLCM-ID is regarded as an attractive technique since it can operate as well as overall maximum likelihood decoding in the range of target BER with low-complexity, and can achieve capacity-approaching perfor- mance with wide outer code assignment. However, MLCM-ID has attracted a relatively small amount of attention in the past, possibly due to a long-standing open problem - outer code as- signment. This is attributed to the complex convergence behaviour analysis ofMLCM-ID, since it has to be jointly evaluated in a multidimensional extrinsic information transfer space. There- fore, no complete code assignment strategy has previously been defined, which has delayed the development ofMLCM-ID compared to bit-interleaved coded modulation with iterative decod- ing (BICM-ID). However, the inherent flexibility in the choice of codes and the strong bit-error correcting capability make MLCM-ID an extremely attractive scheme in practice. This moti- vates us to explore a complete code design rule for MLCM-ID. The major contribution of this work IS the establishment of an efficient, simple and practical code design rule that allows not only sufficient flexibility in the choice of codes but also full convergence close to the theoretical limit. The developed code design rule is adapted to the AWGN channel, Rayleigh fading chan- nel, and is extended to unity-rate code aided MLCM-ID and iterative multi-antenna MLCM-ID.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available