Distribution of Max-Log Metrics for QAM-based BICM in Fading Channels
Journal article, 2009

In this paper, we derive closed-form expressions for the probability density functions (PDFs) of the bits' reliability metrics (L-values) in bit-interleaved coded modulation (BICM) transmission over fully-interleaved fading channels. The expressions are valid for the relevant case of quadrature amplitude modulation (QAM) with Gray mapping when the metrics are calculated via the so-called max-log approximation. Using the developed expressions, the performance of coded BICM transmissions is efficiently evaluated, i.e., without resorting to otherwise required two-dimensional numerical integration. The BICM channel capacity for different fading channels and constellation sizes is also evaluated.


Leszek Szczecinski

INRS-Energy, Materials and Telecommunications

Alex Alvarado

Chalmers, Signals and Systems, Communication, Antennas and Optical Networks

Rodolfo Feick

Universidad Técnica Federico Santa María

IEEE Transactions on Communications

1558-0857 (ISSN)

Vol. 57 9 2558-2563

Areas of Advance

Information and Communication Technology

Subject Categories




More information