On the distribution of extrinsic L-values in gray-mapped 16-QAM

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

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

4 Citaten (Scopus)


In this paper we address the issue of probabilistic modelling of the extrinsic L-values, used as reliability metrics in the context of bit interleaved coded modulation with iterative demapping (BICM-ID). Starting with a simple piece-wise linear model of the L-values obtained via the max-log approximation, we derive the expressions for the cumulative distribution functions of the L-values, that differentiated produce the desired forms of the probability density functions for Gray-mapped 16-QAM. To illustrate the usefulness of our analytical expressions we applied them to efficiently compute the so-called EXIT functions of the demapper for different values of SNR. The proposed analytical expressions are also compared to thehistograms of the L-values obtained through time-consuming simulations.
Originele taal-2Engels
Titel2007 AMC International Wireless Communications and Mobile Computing Conference (IWCMC)
Plaats van productieNew York
UitgeverijAssociation for Computing Machinery, Inc
ISBN van geprinte versie978-1-59593-695-0
StatusGepubliceerd - 2007
Evenementthe 2007 international conference - Honolulu, Hawaii, USA
Duur: 12 aug. 200716 aug. 2007


Congresthe 2007 international conference


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