Decision Directed Channel Estimation Aided OFDM Employing Sample-Spaced and Fractionally-Spaced CIR Estimators

Author

Akhtman, Jos ; Hanzo, Lajos

Author_Institution

Sch. of Electron. & Comput. Sci., Southampton Univ.

Volume

6

Issue

4

fYear

2007

fDate

4/1/2007 12:00:00 AM

Firstpage

1171

Lastpage

1175

Abstract

In this letter we characterize the substantial difference between two channel estimation approaches, namely the sample-spaced (SS) and the fractionally-spaced (FS) channel impulse response (CIR) estimators. The achievable performance of decision-directed channel estimation (DDCE) methods employing both the SS- and the FS-CIR estimators is analyzed in the context of an OFDM system. The performance of the two estimation methods is compared and it is shown that the DDCE scheme employing the projection approximation subspace tracking (PAST)-aided FS-CIR estimator outperforms its SS-CIR estimator-based counterpart

Keywords

OFDM modulation; channel estimation; tracking; OFDM; channel impulse response; decision directed channel estimation; fractionally-spaced CIR estimators; projection approximation subspace tracking; sample-spaced CIR estimators; Availability; Channel estimation; Delay; Employment; Helium; Multiaccess communication; OFDM; Performance analysis; Scattering; Wireless communication;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2007.348308

Filename

4155651