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Detection of Interleaved OFDMA Uplink Signals in the Presence of Residual Frequency Offset Using the SAGE Algorithm

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Authors
Lee, Jong-Ho; Kim, Seong-Cheol
Issue Date
2007-05
Publisher
Institute of Electrical and Electronics Engineers (IEEE); IEEE Vehicular Technology Society
Citation
IEEE Transactions on Vehicular Technology, vol. 56, no. 3, pp. 1455-1460, May 2007
Keywords
orthogonal frequency-division multiple access (OFDMA); residual frequency offset (RFO); space-alternating generalized expectation–maximization (SAGE)
Abstract
In this paper, we propose an iterative detection scheme in the presence of residual frequency offsets (RFOs) using the spacealternating generalized expectation–maximization algorithm for an orthogonal-frequency-division-multiple-access uplink system. In the proposed scheme, the expectation step intends to remove intercarrier interference (ICI) due to the RFOs of simultaneous users in the received signals. Then, the maximization step is utilized to estimate the required parameters for each user (i.e., RFO, data symbols, and channel state information) employing the ICI-cancelled signals. Simulation results show that the proposed scheme achieves almost ideal bit-error-rate performance as long as the magnitude of the normalized RFO value is within 0.2.
ISSN
0018-9545
Language
English
URI
http://hdl.handle.net/10371/5207
DOI
https://doi.org/10.1109/TVT.2007.895574
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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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