Distribution of L-values in gray-mapped M²-QAM signals : exact expressions and simple approximations

A. Alvarado, L.L. Szczecinski, R. Feick, L. Ahumada

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

5 Citations (Scopus)


In this paper we develop formulas for the probability density function (PDF) of the reliability metrics in bit- interleaved coded modulation (BICM) for arbitrary M2-ary quadrature amplitude modulation (M2-QAM) with Gray mapping. The advantage of this approach over an entirely general one proposed previously, is that the resulting formulas are obtained without resorting to any algorithmic steps. We also propose Gaussian mixture approximations that are analytically tractable, and we analyze their accuracy when evaluating uncoded bit error rate (BER) and BICM capacity.
Original languageEnglish
Title of host publication2007 IEEE Global Communications Conference (GLOBECOM)
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
ISBN (Print)978-1-4244-1042-2
Publication statusPublished - Nov 2007
Event2007 IEEE Global Telecommunications Conference (GLOBECOM 2007) - Washington, United States
Duration: 26 Nov 200730 Nov 2007


Conference2007 IEEE Global Telecommunications Conference (GLOBECOM 2007)
Abbreviated titleGLOBECOM 2007
Country/TerritoryUnited States
OtherIEEE GLOBECOM 2007, the 50th Anniversary of GLOBECOM
Internet address


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