On the Impact of Mobility on the Channel Estimation in WIMAX OFDMA-Uplink

Author

Sezgin, Aydin ; Jung, Peter ; Schellmann, Malte ; Halbauer, Hardy ; Muenzner, R.

Author_Institution

Fraunhofer-Inst. for Telecommun., Berlin

fYear

2006

fDate

11-14 Sept. 2006

Firstpage

1

Lastpage

5

Abstract

The demand for wireless broadband access systems supporting mobility of the individual users has dramatically increased in recent years. To this end, we analyze the impact of user-mobility in the uplink of an OFDMA system on the performance of pilot-aided channel estimation. We analyze the mean square error (MSE) performance of two pilot-aided channel estimation schemes, the simple Gauss-Markov estimator and the optimal LMMSE estimator. We derive closed-form expressions for the MSE taking into account the impact of intercarrier-interference and time-variations of the channel. Different pilot allocation strategies are analyzed and their performances are compared. Finally, the results are illustrated by numerical simulations based on the WiMax 802.16e specifications

Keywords

Gaussian processes; Markov processes; WiMax; broadband networks; channel estimation; frequency division multiple access; mean square error methods; radio links; radiofrequency interference; Gauss-Markov estimator; MSE; OFDMA-uplink; WiMax 802.16e; channel estimation; intercarrier-interference; mean square error; optimal LMMSE estimator; pilot-aided channel estimation; pilot-aided channel estimation schemes; wireless broadband access systems; Channel estimation; Communication standards; Digital video broadcasting; Frequency estimation; Gaussian channels; Mobile communication; Numerical simulation; OFDM; Performance analysis; WiMAX;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 2006 IEEE 17th International Symposium on

Conference_Location

Helsinki

Print_ISBN

1-4244-0329-4

Electronic_ISBN

1-4244-0330-8

Type

conf

DOI

10.1109/PIMRC.2006.254127

Filename

4022321