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| A Combined Symbol Timing and Frequency Synchronization and Channel Estimation Technique Based on Detected Data for OFDM Systems |
| Zhao Dan① Yu Quan② Wang Jian-xin② |
| ①(School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China) ②(Graduate school of China Electronics Equipment System Engineering Corporation, Beijing 100039, China) |
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Abstract A new combined symbol timing and frequency synchronization and channel estimation technique by using the detected data is developed for OFDM systems. Open-loop and closed-loop schemes are described in details. The synchronization information contained in the channel estimated results which is gained by LS channel estimation method is extracted based on the Maximum Likelihood (ML) criterion for synchronization estimation，and then the estimated results of symbol timing and frequency are used to correct the initial estimated channel and make it be more equal to the real channel more. Select appropriate length of the block and the value of feedback factors, the algorithm can be used to tracking the time variable channel.
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Received: 26 March 2007
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Corresponding Authors:
Zhao Dan
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2008, Vol. 30 
