On Uplink Channel Estimation in WiMAX Systems

Authors:
Yushi Shen;Pamela C. Cosman;Laurence B. Milstein;Eduardo F. Martinez
Affiliations:
Microsoft, USA;University of California, San Diego, USA;University of California, San Diego, USA;Freescale Semiconductor Inc., USA
Venue:
International Journal of Mobile Computing and Multimedia Communications
Year:
2010

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Abstract

In this paper, channel estimation algorithms are proposed and compared for uplink WiMAX systems, which are OFDMA based. These algorithms are investigated based on a dynamic resource allocation scheme, and it is shown that each of them is suitable to specific system scenarios. For example, for a system with a bandwidth of 10MHz operating in the low frequency region 2-11GHz, a two-dimensional averaging algorithm outperforms other algorithms, such as a bilinear interpolation algorithm, because the correlations between the pilots and signals are sufficiently high in both the frequency and the time dimensions.