In this paper we develop formulas for the probability density function (PDF) of the reliability metrics in bitinterleaved 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. © 2007 IEEE.
Alvarado, A., Szczecinski, L., Feick, R., & Ahumada, L. (2007). GLOBECOM - IEEE Global Telecommunications Conference. 1759-1764. Paper presented at conference, . https://doi.org/10.1109/GLOCOM.2007.339