A Novel Differential Detection for Differential OFDM Systems With High Mobility

In conventional differential detection (CDD), the previous received symbol is used as the phase reference for the current received symbol, therefore the channel variation due to fast fading causes an error floor. We propose a novel iterative decision-directed differential detection (iD4) algorithm f...

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Bibliographic Details
Published inIEEE transactions on broadcasting Vol. 62; no. 2; pp. 398 - 408
Main Authors Liang Zhang, Zhihong Hong, Yiyan Wu, Boudreau, Richard, Thibault, Louis
Format Journal Article
LanguageEnglish
Published New York IEEE 01.06.2016
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Channel estimation
Channels
Correlation
DAB
decision directed
differential detection
Digital audio broadcasting
Error detection
Estimation
Estimators
Fading
fast fading
Modulation
OFDM
Orthogonal Frequency Division Multiplexing
Receivers
Symbols
Time-domain analysis
fast fading
DAB
OFDM
Digital audio broadcasting
differential detection
decision directed
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Summary:In conventional differential detection (CDD), the previous received symbol is used as the phase reference for the current received symbol, therefore the channel variation due to fast fading causes an error floor. We propose a novel iterative decision-directed differential detection (iD4) algorithm for orthogonal frequency division multiplexing (OFDM) systems employing differential PSK modulation in each subcarrier. The core of iD4 is a low complexity time and frequency 2-D estimator which can effectively estimate the channel variation experienced by adjacent time domain symbols. This estimated channel variation is then compensated in the differential detection process. Both theoretical analysis and computer simulations show that significant performance improvement can be achieved using iD4 over the CDD for OFDM receivers in fast fading channels.
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ISSN:0018-9316
1557-9611
DOI:10.1109/TBC.2015.2459656