Turbo DFE Algorithm With Imperfect Decision Feedback

Date

2005

Authors

Trajkovic, Vladimir
Rapajic, Predrag
Kennedy, Rodney

Journal Title

Journal ISSN

Volume Title

Publisher

Institute of Electrical and Electronics Engineers (IEEE Inc)

Abstract

In this letter, we propose a new turbo decision feedback equalizer (DFE) algorithm that takes into account decision feedback error propagation. We derive the exact mathematical expression for the probability density function (pdf) of soft decision feedback symbols, assuming that soft outputs from channel decoder are independent identically distributed Gaussian random variables with known mean and variance. We find a new set of "imperfect" turbo minimum mean-square error DFE coefficients based on the derived pdf. The proposed turbo detector outperforms other turbo equalization algorithms of similar computational complexity in terms of bit-error rate. The achieved improvement is up to 3.8 dB for severe frequency-selective channels.

Description

Keywords

Keywords: Algorithms; Bit error rate; Communication channels (information theory); Computational complexity; Computer simulation; Decoding; Mathematical models; Probability density function; Turbo codes; Decision feedback equalizer (DFE); Imperfect feedback; Turbo Decision feedback equalizer (DFE); Imperfect feedback; Turbo equalization

Citation

Source

IEEE Signal Processing Letters

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1109/LSP.2005.859524

Restricted until

2037-12-31