Elements of information theory
Elements of information theory
Low-complexity Turbo-equalization for diversity channels
Signal Processing
ICWMC '07 Proceedings of the Third International Conference on Wireless and Mobile Communications
Improved turbo equalization based on soft ISI cancellation
Signal Processing
IEEE Transactions on Wireless Communications
Bit-interleaved coded modulation
IEEE Transactions on Information Theory
Turbo equalization: adaptive equalization and channel decoding jointly optimized
IEEE Journal on Selected Areas in Communications
Subblock processing in MMSE-FDE under fast fading environments
IEEE Journal on Selected Areas in Communications
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The performance of the bit-interleaved coded modulation using turbo equalization with single carrier frequency domain equalization (BICM TE-SC-FDE) over frequency-selective fading channels with the residual inter-symbol interference (ISI) is investigated. We focus on the impact of the residual ISI on the convergence behavior using the extrinsic information transfer (EXIT) chart. We first exhibit that the residual ISI impacts not only the error floor but also the convergence behavior of the BICM TE-SC-FDE. Then, we show that the Gaussian assumption of the soft information within the TE-SC-FDE, with or without the residual ISI, can accurately track the flow of the extrinsic information in the iterative procedure. We exhibit through simulation the accuracy of the EXIT chart in predicting the transfer function of the equalizer. We show that the product of the transmit block length and Doppler spread is a key parameter affecting the convergence behavior of the TE-SC-FDE with the residual ISI. The accuracy of our EXIT chart prediction is verified by simulation.