NDLI: Vector equalization: an alternative approach for OFDM systems

Content Provider	Springer Nature Link
Author	DéMoulin, Vincent PéCOT, Michel
Copyright Year	1997
Abstract	We present in this paper an approach based on some kind of decision feedback vector equalization, which allows, withofdm modulation, to avoid the insertion of any guard interval. The bit rate that is thus saved may be used to increase efficiently the correction capabilities of the channel decoder and consequently the overall performances of the system. Indeed, over frequency selective channel the proposed scheme outperforms classical solutions (using a guard interval) with up to 3 dB in term of signal to noise ratio. The weak point of this vector equalization approach is of course an increase of the computational complexity, by a factor of about 8. Sub-optimal solutions, relying on sub-channel equalization, may be derived which provide similar complexity as the guard interval approach, however their performance gain is very much reduced, especially for critical channelsi.e with deep fadings). Now, the progress in dsp integration make it possible to envisage in the short term the implementation of the optimal scheme for practical applications, especially when shortffts can be used.Cet article présente une solution basée sur une technique ďégalisation vectorielle avec décision réfléchie, qui permet, dans le cas de la modulationofdm de supprimer les intervalles de garde. Le débit binaire ainsi économisé peut être utilisé pour accroître substantiellement les capacités de correction du décodeur de canal, et donc les performances du système. En fait, sur canal sélectif, cette approche permet ďobtenir (à débit égal) un gain en rapport signal à bruit pouvant atteindre 3 dB, vis-à-vis de la solution habituelle utilisant un intervalle de garde. Le point faible de cette technique réside bien évidemment dans sa complexité de mise en œuvre, environ huit fois plus élevée. Des solutions sous-optimales, reposant sur une égalisation par sous-canaux, peuvent être envisagées. La complexité est alors ramenée à un niveau comparable à celle de ľapproche par intervalle de garde, mais les performances obtenues en sont fortement affectées, notamment sur canal critique (évanouissements profonds). Ľévolution constante de la puissance de calcul des processeurs de traitement de signal permet toutefois ďenvisager à court terme la mise en œuvre de la solution optimale par égalisation vectorielle, en particulier pour des applications ne nécessitant pas un nombre de sous-porteuses trop important.
Starting Page	4
Ending Page	11
Page Count	8
File Format	PDF
ISSN	00034347
Journal	Annales Des Télécommunications
Volume Number	52
Issue Number	1-2
e-ISSN	19589395
Language	French
Publisher	Springer-Verlag
Publisher Date	1997-01-01
Publisher Place	Paris
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Egaliseur Méthode vectorielle Multiplexage fréquence Signal orthogonal Transmission multicanal Décision réfléchie Propagation trajet multiple Communications Engineering, Networks Information Systems and Communication Service Signal, Image and Speech Processing Computer Communication Networks Information and Communication, Circuits R & D/Technology Policy
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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