Common OFDM systems guard individual symbols by means of Cyclic Prefix (CP). This does not only serve the purpose of preventing intersymbol interference (ISI), it also induces cyclicity which is necessary to equalize the re- ceived signal in the frequency domain. Recently unique word
(UW) OFDM has been proposed as a new approach to create guard intervals which feature the same properties regarding ISI and cyclicity. In this paper we will shortly revisit both methods of creating a guard interval by means of cyclic pre- fix and unique word, respectively. In order to compare both OFDM concepts the physical layer of Digital Video Broad- casting for terrestrial television (DVB-T) was modified to support UW-OFDM. Extensive simulations have been per- formed to evaluate cyclic prefix und unique word in terms of bit error rate and spectral efficiency.
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