Successive NBI Cancellation Using Soft Decisions for OFDM Systems

Author

Darsena, Donatella ; Verde, Francesco

Author_Institution

Dipt. per le Tecnol., Univ. di Napoli Parthenope, Napoli

Volume

15

fYear

2008

fDate

6/30/1905 12:00:00 AM

Firstpage

873

Lastpage

876

Abstract

Recently, we proposed a successive narrowband interference (NBI) cancellation method for orthogonal frequency-division multiplexing (OFDM) systems, which empowers the conventional one-tap frequency-domain equalizer to gain in robustness against NBI. In this letter, we generalize such an approach by using soft (instead of hard) feedback from the decoding unit, when the digitally-modulated NBI is (possibly) improper. It is shown that, with respect to our previous work, the devised equalizers allow one to achieve a significant performance gain, with a moderate increase in computational complexity.

Keywords

OFDM modulation; computational complexity; interference suppression; OFDM systems; computational complexity; narrowband interference cancellation method; one-tap frequency-domain equalizer; orthogonal frequency-division multiplexing; soft decisions; Computational complexity; Decoding; Equalizers; Feedback; Frequency division multiplexing; Interference cancellation; Narrowband; OFDM; Performance gain; Robustness; Narrowband interference (NBI) suppression; orthogonal frequency-division multiplexing (OFDM); soft decision feedback; widely-linear processing;

fLanguage

English

Journal_Title

Signal Processing Letters, IEEE

Publisher

ieee

ISSN

1070-9908

Type

jour

DOI

10.1109/LSP.2008.2001808

Filename

4691037