Carrier-Frequency Offset Compensation for Interleaved-OFDMA Uplink Using Adaptive Beamformer

Fan Da; Cao Zhi-gang

doi:10.3724/SP.J.1146.2006.00763

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Fan Da, Cao Zhi-gang. Carrier-Frequency Offset Compensation for Interleaved-OFDMA Uplink Using Adaptive Beamformer[J]. Journal of Electronics & Information Technology, 2007, 29(8): 1924-1928. doi: 10.3724/SP.J.1146.2006.00763

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Fan Da, Cao Zhi-gang. Carrier-Frequency Offset Compensation for Interleaved-OFDMA Uplink Using Adaptive Beamformer[J]. Journal of Electronics & Information Technology, 2007, 29(8): 1924-1928. doi: 10.3724/SP.J.1146.2006.00763

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Carrier-Frequency Offset Compensation for Interleaved-OFDMA Uplink Using Adaptive Beamformer

doi: 10.3724/SP.J.1146.2006.00763

Received Date: 2006-06-01
Rev Recd Date: 2006-10-30
Publish Date: 2007-08-19

Abstract

Abstract

In orthogonal frequency-division multiple access (OFDMA), closely spaced multiple subcarrier are assigned to different users for parallel signal transmission. An interleaved subcarrier-assignment scheme is preferred because it provides maximum frequency diversity and increases the capacity in frequency-selective fading channels. Carrier-frequency offsets (CFOs) between the transmitter and the receiver destroy the orthogonality and introduce Inter-Carrier Interferences (ICI) and Multi-User Interferences (MUI). In this paper, the signal structure at the Interleaved-OFDMA uplink is first present. Then a CFO compensation method for the system, which uses adaptive beamformer, is proposed as an alternative to the circular convolution method. And two adaptive beamformers, i.e. matched filter and MMSE method are introduced. Simulation results indicate that the MMSE beamformer outperforms the matched filter and the circular convolution method.

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References(1)

References

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