Iterative channel estimation using soft decision feedback

Author

Sandell, Magnus ; Luschi, Carlo ; Strauch, Paul ; Yan, Ran

Author_Institution

Lucent Technol., AT&T Bell Labs., Swindon, UK

Volume

6

fYear

1998

fDate

1998

Firstpage

3728

Abstract

We present an iterative channel estimation scheme with soft decision feedback. In a block-by-block transmission system with a soft-output equalizer and/or decoder it is possible to feed back the decisions to the channel estimator to improve its performance. We propose to feed back soft decisions which will reduce error propagation. We also derive a suboptimal estimator with substantially lower complexity and present simulations for a GSM-like system. The improvement of the bit-error rate over non-iterative schemes with this low complexity estimator is about 0.8 dB (equalizer feedback) and 1.5 dB (decoder feedback)

Keywords

cellular radio; decision feedback equalisers; decoding; error statistics; intersymbol interference; iterative methods; mean square error methods; optimisation; telecommunication channels; GSM-like system; ISI; bit-error rate; block-by-block transmission system; decoder feedback; equalizer feedback; error propagation reduction; intersymbol interference; iterative channel estimation; least square estimate; low complexity estimator; noniterative schemes; optimal channel estimator; performance; simulations; soft decision feedback; soft-output equalizer; suboptimal estimator; Bit error rate; Channel estimation; Detectors; Equalizers; Feedback; Feeds; Impedance; Intersymbol interference; Iterative decoding; Radio access networks;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 1998. GLOBECOM 1998. The Bridge to Global Integration. IEEE

Conference_Location

Sydney,NSW

Print_ISBN

0-7803-4984-9

Type

conf

DOI

10.1109/GLOCOM.1998.776006

Filename

776006