Channel Estimation and Tracking for MIMO OFDM Systems Using EM Algorithm
碩士 === 國立成功大學 === 電腦與通信工程研究所 === 94 === For MIMO OFDM systems, channel estimation schemes have been mostly based on pilot-assisted approaches, assuming a quasi-static fading model that allows the channel to be constant for a block of symbols and change independently to a new realization. Using dete...
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| Format: | Others |
| Language: | en_US |
| Published: |
2006
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| Online Access: | http://ndltd.ncl.edu.tw/handle/88348140594356080471 |
| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 94 === For MIMO OFDM systems, channel estimation schemes have been mostly based on pilot-assisted approaches, assuming a quasi-static fading model that allows the channel to be constant for a block of symbols and change independently to a new realization. Using detected symbols as a pilot symbol is a general way to tracking time varying channel, but error propagation might happen. In this thesis, we exploit error control coding to correct detected symbols. With EM algorithm, we can derive a simple and effective way to track time varying channel in MIMO OFDM systems.
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