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Low Complexity Decoding of Bit-Interleaved Coded Modulation for M-ary QAM

Summary: Low Complexity Decoding of Bit-Interleaved
Coded Modulation for M-ary QAM
Enis Akay and Ender Ayanoglu
Center for Pervasive Communications and Computing
Department of Electrical Engineering and Computer Science
The Henry Samueli School of Engineering
University of California, Irvine
Irvine, California 92697-2625
Email: eakay@uci.edu ayanoglu@uci.edu
Abstract-- It has been shown by Zehavi that the performance
of coded modulation can be improved over a Rayleigh fading
channel by bit-wise interleaving at the encoder output, and by
using an appropriate soft-decision metric for a Viterbi decoder
at the receiver. Caire et al presented the details of the theory
behind bit-interleaved coded modulation (BICM).
In this paper we show that for Gray encoded M-ary quadra-
ture amplitude modulation (QAM) systems, the bit metrics of
BICM can be further simplified. In QAM systems, the maximum
likelihood (ML) detector for BICM uses the minimum distance
between the received symbol and M/2 constellation points on


Source: Ayanoglu, Ender - Department of Electrical and Computer Engineering, University of California, Irvine


Collections: Engineering