Iterative Equalization with Soft Feedback with a Subsequent Stage Utilizing Hopfield Networks for Error Search and Correction
Rößler J, Gerstacker W, Huber J (2004)
Publication Type: Conference contribution
Publication year: 2004
Journal
Publisher: VDE-Verlag
Edited Volumes: ITG-Fachbericht
Pages Range: 87-94
Conference Proceedings Title: Conference Proceedings
Event location: Erlangen, Germany
Abstract
In this paper, a second stage for algorithms applying iterative soft decision interference cancellation (ISDIC), for channel equalization is proposed performing error search and correction. Analysis by simulations shows that a matched filter (MF) ISDIC with subsequent second stage can outperform a more complex minimum mean-squared error (MMSE) ISDIC. Furthermore, the latter can be improved by the proposed second stage by up to 2 dB. It is shown that the ISDIC scheme with following second stage can reach the matched filter bound up to a fraction of a dB for all analyzed channels and 4QAM transmission and up to 1 dB for 16QAM transmission. In [1] it has been reported that the MF ISDIC performs very well for highly dispersive channels, e.g. with 60 symbol-spaced paths, but for channels of moderate dispersion an error floor occurs. Utilizing performance bounds for delayed decision-feedback sequence estimation (DDFSE) we show that now already for channels of moderate length, e.g. 20 symbol-spaced taps, even the low-complexity MF ISDIC with the proposed subsequent second stage outperforms a DDFSE approach with about 109 states.
Authors with CRIS profile
Wolfgang Gerstacker
Lehrstuhl für Digitale Übertragung
Johannes Huber
Lehrstuhl für Informationsübertragung
How to cite
APA:
Rößler, J., Gerstacker, W., & Huber, J. (2004). Iterative Equalization with Soft Feedback with a Subsequent Stage Utilizing Hopfield Networks for Error Search and Correction. In Conference Proceedings (pp. 87-94). Erlangen, Germany, DE: VDE-Verlag.
MLA:
Rößler, Jürgen, Wolfgang Gerstacker, and Johannes Huber. "Iterative Equalization with Soft Feedback with a Subsequent Stage Utilizing Hopfield Networks for Error Search and Correction." Proceedings of the 5th ITG Conference on Source and Channel Coding, Erlangen, Germany VDE-Verlag, 2004. 87-94.
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