Evolution Analysis of Iterative BICM Receivers with Expectation Propagation over ISI Channels

• Published in: 2019 IEEE International Symposium on Information Theory (ISIT) pp. 166 - 170
• Main Authors: Sahin, Serdar, Cipriano, Antonio Maria, Poulliat, Charly, Boucheret, Marie-Laure
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.07.2019
• Subjects: Analytical models; Bit-interleaved coded modulation; Decoding; Equalizers; evolution analysis; EXIT; expectation propagation; inter-symbol interference; Iterative decoding; Modulation; Probability density function; Receivers
• ISSN: 2157-8117
• DOI: 10.1109/ISIT.2019.8849816

This paper investigates the dynamic behaviour of doubly iterative bit-interleaved coded modulation (BICM) receivers based on expectation propagation (EP). When implemented in the frequency domain, for single-carrier (SC) systems, such receivers achieve attractive performance-complexity trade-offs in quasi-static wideband channels. With this category of receivers, conventional binary extrinsic information transfer (EXIT) functions are subject to a great number of parameters, including channel realizations, constellation and inner iteration parameters. Hence, this paper proposes a novel extrinsic information evolution analysis method which simplifies the receiver's EXIT function into independent inner transfer functions. The core idea is to track state-evolution dynamics of EP through numerically stable extrinsic variance/information transfer (EXVIT) functions. Numerical results attest to the accuracy of this method for tracking the asymptotic receiver behaviour.