EXIT chart analysis of iterative receivers for space-time coded OFDM systems

Authors

Stephan Sand, Simon Plass, and Armin Dammann

Reference

IEEE Vehicular Technology Conference 2007 Fall, Baltimore, USA, Oct. 2007.

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Abstract

In this paper, we analyze an orthogonal frequency division multiplexing (OFDM) system employing combined spacetime-frequency (STF) codes and an iterative receiver with extrinsic information transfer (EXIT) charts and bit-error rate plots. As STF codes, we examine orthogonal space-time block codes (OSTBCs), cyclic delay diversity, and discontinuous Doppler diversity. We present a combined STF code for eight transmit antennas with rate one. Another contribution of this work is the EXIT chart analysis demonstrating that EXIT charts are not always a suitable tool to analyze the performance of iterative receivers for STF coded OFDM systems. Further, error floors due to the mapping can be removed even for correlated channels by differential encoding and code doping the bits before the modulator.

Keywords

OFDM - Orthogonal space-time block code - Cyclic delay diversity - Discontinuous Doppler diversity - Iterative receiver - EXIT chart - differential encoding - code doping

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