標題: | Pilot-Based LMMSE Channel Estimation for OFDM Systems With Power-Delay Profile Approximation |
作者: | Hung, Kun-Chien Lin, David W. 電子工程學系及電子研究所 Department of Electronics Engineering and Institute of Electronics |
關鍵字: | Channel estimation;IEEE 802.16e;Mobile WiMAX;orthogonal frequency-division multiple access (OFDMA);orthogonal frequency-division multiplexing (OFDM);root-mean-square (RMS) delay spread |
公開日期: | 1-一月-2010 |
摘要: | In linear-minimum-mean-square-error (LMMSE) channel estimation for multicarrier systems, one needs to know the channel correlation function. This poses a problem for systems with a small number of pilots operating in time-varying channels. We propose to approximate the channel power-delay profile (PDP) with a shape that can completely be described in two parameters, namely, the mean delay and the root-mean-square (RMS) delay spread. Furthermore, we develop a simple technique to estimate these delay parameters. The approximate PDP is then used to generate the LMMSE filter coefficients for data-subcarrier channel estimation. Mathematical expressions are derived that can be used to predict the accuracy of the various estimates, and they are verified by simulation. The proposed technique is applicable to both point-to-point communication and multiaccess communication where different users may experience different channel conditions. As a practical application, we also specialize the proposed technique to Mobile WiMAX signals and investigate the resulting performance. |
URI: | http://dx.doi.org/10.1109/TVT.2009.2029862 http://hdl.handle.net/11536/6270 |
ISSN: | 0018-9545 |
DOI: | 10.1109/TVT.2009.2029862 |
期刊: | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY |
Volume: | 59 |
Issue: | 1 |
起始頁: | 150 |
結束頁: | 159 |
顯示於類別: | 期刊論文 |