標題: Frequency estimators for MIMO-OFDM systems
作者: Chiang, David C. -H.
Su, Yu T.
電信工程研究所
Institute of Communications Engineering
關鍵字: orthogonal frequency division multiplexing (OFDM);multiple input multiple output (MIMO);frequency estimation
公開日期: 1-Dec-2007
摘要: Orthogonal frequency division multiplexing (OFDM) systems are known to be sensitive to carrier frequency offset (CFO). This paper is concerned with the CFO estimation for multiple input multiple output (MIMO) systems employing OFDM waveforms. We present two approaches to derive maximum likelihood (ML) pilot-assisted frequency estimators that use either two or multiple identical training symbols. It is shown that the resulting ML frequency estimators are similar to maximum ratio combining versions of Moose estimator and Yu-Su solution, respectively. Numerical examples demonstrate that the proposed frequency estimators are robust against spatial Signal-to-noise ratio (SNR) variation and they yield performance superior to that of the corresponding single-antenna system.
URI: http://dx.doi.org/10.1007/s11277-007-9295-y
http://hdl.handle.net/11536/10049
ISSN: 0929-6212
DOI: 10.1007/s11277-007-9295-y
期刊: WIRELESS PERSONAL COMMUNICATIONS
Volume: 43
Issue: 4
起始頁: 1201
結束頁: 1207
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