Unique word prefix in SC/FDE and OFDM: A comparison

Author

Huemer, Mario ; Hofbauer, Christian ; Huber, Johannes B.

Author_Institution

Inst. of Networked & Embedded Syst., Klagenfurt Univ., Klagenfurt, Austria

fYear

2010

fDate

6-10 Dec. 2010

Firstpage

1296

Lastpage

1301

Abstract

The concept of using unique word (UW) prefixes instead of cyclic prefixes (CPs) is already well investigated for single carrier systems with frequency domain equalization (SC/FDE). In OFDM (orthogonal frequency division multiplexing), where the data symbols are specified in frequency domain, the introduction of UWs - which are specified in time domain - is not that straight forward. In this paper we show how unique words can also be introduced in OFDM symbols. In OFDM our proposed method introduces correlations between subcarrier symbols. This allows to apply a highly efficient LMMSE (linear minimum mean square error) receiver. Throughout this paper we discuss the similarities and differences of UW-SC/FDE and UW-OFDM transmitter/receiver processing, and we present simulation results in indoor multipath environments.

Keywords

OFDM modulation; equalisers; indoor communication; least mean squares methods; radio receivers; LMMSE; OFDM; SC/FDE; frequency domain equalization; indoor multipath environment; linear minimum mean square error receiver; orthogonal frequency division multiplexing; single carrier system; subcarrier symbol; unique word prefix;

fLanguage

English

Publisher

ieee

Conference_Titel

GLOBECOM Workshops (GC Wkshps), 2010 IEEE

Conference_Location

Miami, FL

Print_ISBN

978-1-4244-8863-6

Type

conf

DOI

10.1109/GLOCOMW.2010.5700147

Filename

5700147