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Time and Frequency Synchronization for OFDMA Uplink System using the SAGE Algorithm

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Authors
Lee, Jong-Ho; Kim, Seong-Cheol
Issue Date
2007-04
Publisher
Institute of Electrical and Electronics Engineers (IEEE); IEEE Communications Society; IEEE Signal Processing Society
Citation
IEEE Trans. Wireless Commun., vol. 6, pp. 1176-1181, April 2007
Keywords
synchronization; multiple access interference (MAI); orthogonal frequency division multiple access (OFDMA); space-alternating generalized expectation-maximization (SAGE)
Abstract
In this letter, we propose an iterative time and frequency synchronization scheme for orthogonal frequencydivision multiple access (OFDMA) uplink system using the space-alternating generalized expectation-maximization (SAGE) algorithm. In the proposed scheme, the expectation step of the SAGE algorithm is intended to remove the multiple-access interference (MAI) caused by the other asynchronous users. Then, the maximization step is utilized in the timing and frequency offset estimation of each asynchronous user using the MAI-canceled signals. Simulation results present that the proposed scheme shows performance enhancement in the presence of multiple asynchronous users.
ISSN
1536-1276
Language
English
URI
http://hdl.handle.net/10371/5210
DOI
https://doi.org/10.1109/TWC.2007.348309
https://doi.org/10.1109/TWC.2007.348309
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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