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Decision-Feedback Turbo Equalization for Coded Intersymbol Interference Channels

Zhiliang Qin

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Abstract

The turbo equalizer based on the BCJR algorithm has an exponential computational complexity in terms of channel memory length. In this paper, we propose a low-complexity soft-input/soft-output (SISO) channel detector for intersymbol interference (ISI) channels based on tentative hard estimates fed back from the outer decoder in the previous iteration. It is shown that the proposed detector can greatly reduce the complexity with a negligible performance loss compared to the BCJR algorithm

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What this paper is about

The turbo equalizer based on the BCJR algorithm has an exponential computational complexity in terms of channel memory length. In this paper, we propose a low-complexity soft-input/soft-output (SISO) channel detector for intersymbol interference (ISI) channels based on tentative hard estimates fed back from the outer decoder in the previous iteration. It is shown that the proposed detector can greatly reduce the complexity with a negligible performance loss compared to the BCJR algorithm

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Available abstract

The turbo equalizer based on the BCJR algorithm has an exponential computational complexity in terms of channel memory length. In this paper, we propose a low-complexity soft-input/soft-output (SISO) channel detector for intersymbol interference (ISI) channels based on tentative hard estimates fed back from the outer decoder in the previous iteration. It is shown that the proposed detector can greatly reduce the complexity with a negligible performance loss compared to the BCJR algorithm

Key concepts: Intersymbol interference, Turbo, Turbo equalizer, Equalization (audio), Computer science, BCJR algorithm, Turbo code, Detector

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