Title :
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
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;
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
DOI :
10.1109/PIMRC.2006.254127
