1. Decision Feedback Semi-blind Estimation Algorithm for Specular OFDM Channels
- Author
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Marius Pesavento, Abdelhamid Ladaycia, Anissa Mokraoui, Karim Abed-Meraim, Adel Belouchrani, Communication Systems Group, NTS, Technische Universität Darmstadt (TU Darmstadt)-Technische Universität Darmstadt (TU Darmstadt), Laboratoire de Traitement et Transport de l'Information (L2TI), Université Paris 13 (UP13)-Institut Galilée-Université Sorbonne Paris Cité (USPC), Laboratoire Pluridisciplinaire de Recherche en Ingénierie des Systèmes, Mécanique et Energétique (PRISME), Université d'Orléans (UO)-Ecole Nationale Supérieure d'Ingénieurs de Bourges (ENSI Bourges), Ecole Nationale Polytechnique [Alger] (ENP), and Abed-Meraim, Karim
- Subjects
Estimation ,[INFO.INFO-TS] Computer Science [cs]/Signal and Image Processing ,Orthogonal frequency-division multiplexing ,Computer science ,Equalizer ,020206 networking & telecommunications ,02 engineering and technology ,Communications system ,Symbol (chemistry) ,[INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Specular reflection ,Algorithm ,ComputingMilieux_MISCELLANEOUS ,Subspace topology ,Computer Science::Information Theory ,Communication channel - Abstract
This paper deals with semi-blind channel estimation in Single-Input Single-Output (SISO) Orthogonal Frequency Division Multiplexing (OFDM) communications system. The proposed algorithm proceeds in two main stages. The first one addresses the pilot-based Time-Of-Arrival (TOA) estimation using subspace methods and then estimates the channel through its specular model. In the second stage, one considers a decision feedback equalizer that is used to refine the channel parameters estimates. Simulation results show that good performance can be reached with only one OFDM pilot symbol with appropriate windowing using only one iteration. A significant performance improvement as compared to the pilot-based TOA method is observed.
- Published
- 2019
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