Study of Cyclic Delay Diversity for Single Frequency Network using DRM Standard

Konferenz: European Wireless 2013 - 19th European Wireless Conference
16.04.2013 - 18.04.2013 in Guildford, UK

Tagungsband: European Wireless 2013

Seiten: 6Sprache: EnglischTyp: PDF

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Savaux, Vincent (ECAM Rennes, Louis de Broglie, Campus de Ker Lann, Bruz, 35091 Rennes Cedex 9, France )
Djoko-Kouam, Moïse (ECAM Rennes, Louis de Broglie, Campus de Ker Lann, Bruz, 35091 Rennes Cedex 9, France)
Skrzypczak, Alexandre (Zodiac Data Systems, 2 rue de Caen, 14740 Bretteville l?Orgueilleuse, France)

Abstract?This paper presents a study of cyclic delay diversity (CDD) for a single frequency network (SFN) using digital radio mondiale (DRM) standard. Flat fading over the bandwidth can entirely disrupt the signal during several orthogonal frequency division multiplexing (OFDM) symbols. In such conditions, chan- nel encoding can only partially recover the sent information. In order to overcome this problem, CDD articially increases the frequency selectivity of the channel by adding a phase to the signal at the emitter side. We describe the principle in the case of two transmit antennas, and for a more complete network model, where three values of phase shifting are considered. We measure the gain provided by CDD for one process on one hand and in average on the other hand. In order to complete the study, we show the effect of the increase of frequency selectivity on the channel estimation performance. Index Terms - ?COFDM, delay diversity, single frequency net- work, digital radio mondiale.