New Techniques for OFDM: Unique Word Prefix for OFDM - Couverture souple

Patil, Nilesh; Deshmukh, Monali

Couverture souple

ISBN 10 : 6200535752 ISBN 13 : 9786200535757

Editeur : LAP LAMBERT Academic Publishing, 2020

Synopsis

We expand our recently introduced concept of unique word orthogonal frequency division multiplexing (UW-OFDM). In UW-OFDM the cyclic prefixes (CPs) are replaced by deterministic sequences, the so-called unique words (UWs). The UWs are generated by appropriately loading a set of redundant subcarriers. By that a systematic complex number Reed–Solomon (RS) code construction is introduced in a quite natural way, because an RS code may be defined as the set of vectors, for which a block of successive zeros occurs in the other domain w.r.t. a discrete Fourier transform. (For a fixed block different to zero, i.e., a UW, a coset code of an RS code is generated.)A remaining problem in the original systematic coded UW-OFDM concept is the fact that the redundant subcarrier symbols disproportionately contribute to the mean OFDM symbol energy. In this paper we introduce the concept of non-systematic coded UW-OFDM, where the redundancy is no longer allocated to dedicated subcarriers, but distributed over all subcarriers. We derive optimum complex valued code generator matrices matched to the best linear unbiased estimator (BLUE) and to the linear minimum mean square error (LMMSE) data estimate.

Détails de l'édition

• Éditeur: LAP LAMBERT Academic Publishing
• Date d'édition: 2020
• Langue: anglais
• ISBN 10: 6200535752
• ISBN 13: 9786200535757
• Reliure: Broché
• Nombre de pages: 52
• Coordonnées du fabricant: non disponible
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