Performance of iterative MAP receiver for MIMO-OFDM channels with anti-gray mapping

S. Ahmed*, T. Ratnarajah, M. Sellathurai, C. F.N. Cowan

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


In recent years, due to the low complexity nature of the turbo processing and excellent bit-error-rate (BER) performance, designing turbo-like receivers for frequency-selective MIMO channels has been of great research interest. The performance gain in turbo decoders is due to an extrinsic information transfer (EXIT) process between the detection and the decoding stages as compare to a traditional system that treats these processes in isolation. However, the challenge faced with these iterative receivers is the understanding of their performance and convergence behaviour. In this paper, we study an iterative maximum a posteriori (MAP) receiver for MIMO orthogonal frequency division multiplexing (OFDM) channels and its convergence behaviour. We analyze the performance of the proposed transceiver system with Gray and anti-Gray mapping using EXIT chart and study the effects of various settings of transmit and receive antenna on the turbo cliff in BER performance.

Original languageEnglish (US)
Title of host publication2008 IEEE 67th Vehicular Technology Conference-Spring, VTC
Number of pages5
StatePublished - 2008
Externally publishedYes
Event2008 IEEE 67th Vehicular Technology Conference-Spring, VTC - Marina Bay, Singapore
Duration: May 11 2008May 14 2008

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252


Other2008 IEEE 67th Vehicular Technology Conference-Spring, VTC
CityMarina Bay


  • Anti-Gray and Gray modulation
  • EXIT chart
  • Iterative receiver
  • MAP
  • MIMO frequency-selective channels
  • OFDM

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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