On the Exploitation of the Redundant Energy in UW-OFDM: LMMSE Versus Sphere Detection

Author

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

Author_Institution

Inst. of Networked an Embedded Syst., Alpen-Adria-Univ. Klagenfurt, Klagenfurt, Austria

Volume

19

Issue

6

fYear

2012

fDate

6/1/2012 12:00:00 AM

Firstpage

340

Lastpage

343

Abstract

Unique word orthogonal frequency division multiplexing (UW-OFDM) inherently introduces a complex number Reed Solomon (RS) code. Originally, the code generator matrix of systematic coded UW-OFDM had been designed rather intuitively by minimizing the mean redundant energy. In this work we justify this approach by applying a cost function that incorporates the overall transceiver chain including a linear minimum mean square error (LMMSE) data estimator. In addition to the LMMSE estimator we investigate a nonlinear sphere detection (SD) receiver for both systematic and nonsystematic coded UW-OFDM. We study and interpret the estimators´ performance and their diverse ability to exploit the redundant energy.

Keywords

OFDM modulation; Reed-Solomon codes; least mean squares methods; LMMSE data estimator; RS code; Reed Solomon code; linear minimum mean square error data estimator; nonlinear SD receiver; nonlinear sphere detection receiver; nonsystematic coded UW-OFDM; redundant energy; unique word orthogonal frequency division multiplexing; Estimation; Frequency domain analysis; Neodymium; OFDM; Systematics; Time domain analysis; Vectors; Cyclic prefix (CP); OFDM; minimum mean square error (MMSE); sphere detection (SD); unique word OFDM (UW-OFDM);

fLanguage

English

Journal_Title

Signal Processing Letters, IEEE

Publisher

ieee

ISSN

1070-9908

Type

jour

DOI

10.1109/LSP.2012.2194737

Filename

6184288