EXIT chart optimization of Repeat-Accumulate codes for an N-Frequency T-User Multiple Access Channel with noise

  • Manish Sharma Instituto Tecnológico de Aeronáutica
  • Jaime Portugheis Faculdade de Tecnologia da Unicamp

Abstract

In this paper we show how a graph-based systemcan be designed for an N-FSK T-user multiple access channel withnoise. The channel is a frequency selective fast fading channelwith additive white Gaussian Noise. The system does not knowor attempt to determine the fading incurred at a given moment.The system is composed of a multiuser detector and T differentRepeat-Accumulate (RA) decoders. The decoders are optimizedas a set and consequently have the same parameters. A structuralvariation between the users’ encoders/decoders is sufficient toallow for multiple access and channel error correction, whileproviding rates close to channel capacity.

Author Biographies

Manish Sharma, Instituto Tecnológico de Aeronáutica
Dr. Manish Sharma is professor of Telecommunications at the Instituto Tecnológio da Aeronáutica since 2009. He obtained his doctorate in Electical Engineering at the State University of Campinas in 2010.
Jaime Portugheis, Faculdade de Tecnologia da Unicamp
Dr. Jaime Portugheis was with Departamento de Comunicaçõees, Faculdade deEngenharia Elétrica e de Compupatação, Unicamp, Campinas-SP. He is now with Faculdade de Tecnologia da Unicamp
Published
21-04-2014
How to Cite
Sharma, M., & Portugheis, J. (2014). EXIT chart optimization of Repeat-Accumulate codes for an N-Frequency T-User Multiple Access Channel with noise. Journal of Communication and Information Systems, 28(1). https://doi.org/10.14209/jcis.2013.4
Section
Regular Papers