Two approaches to multilevel QAM coding

A. R. Oka, S. Bross, S. Shamai

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


A systematic way of designing high gain moderate latency multilevel trellis coded modulation is developed. Various multi-level geometrically uniform partitions of 2D-QAM are investigated such that they lead to the 8-way 'Ungerboek' partition which allows up to 6 dB gain over uncoded modulation. The mod-lambda multilevel capacities determine the possible allocation of rates in the different levels, and hence decide overall latency. Group coding techniques are used to design the component codes, and simulations and bounds are provided for the proposed multilevel schemes. The question: «how much complexity is required to achieve an effective coding gain (excluding shaping) of 6.0 dB at BER 10-7...10-10 with moderate latency and practical multistage decoding?» is addressed.

Original languageEnglish
Title of host publicationProceedings - 1998 IEEE International Symposium on Information Theory, ISIT 1998
Number of pages1
StatePublished - 1998
Externally publishedYes
Event1998 IEEE International Symposium on Information Theory, ISIT 1998 - Cambridge, MA, United States
Duration: 16 Aug 199821 Aug 1998

Publication series

NameIEEE International Symposium on Information Theory - Proceedings
ISSN (Print)2157-8095


Conference1998 IEEE International Symposium on Information Theory, ISIT 1998
Country/TerritoryUnited States
CityCambridge, MA

Bibliographical note

Funding Information:
Acknowledgements. This study was supported in part by a grant from the United States-Israel Binational Science Foundation. The authors wish to thank Ms. R. Sahar for her skilled technical assistance.


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