Multiuser Carrier Frequency Offset Estimation for WiMAX Initial Ranging Based on OFDMA

Fan Da; Cao Zhi-gang; Yi Zhi-ling

doi:10.3724/SP.J.1146.2008.01413

Volume 31 Issue 11

Dec. 2010

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Fan Da, Cao Zhi-gang, Yi Zhi-ling. Multiuser Carrier Frequency Offset Estimation for WiMAX Initial Ranging Based on OFDMA[J]. Journal of Electronics & Information Technology, 2009, 31(11): 2659-2664. doi: 10.3724/SP.J.1146.2008.01413

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Fan Da, Cao Zhi-gang, Yi Zhi-ling. Multiuser Carrier Frequency Offset Estimation for WiMAX Initial Ranging Based on OFDMA[J]. Journal of Electronics & Information Technology, 2009, 31(11): 2659-2664. doi: 10.3724/SP.J.1146.2008.01413

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Multiuser Carrier Frequency Offset Estimation for WiMAX Initial Ranging Based on OFDMA

doi: 10.3724/SP.J.1146.2008.01413 cstr: 32379.14.SP.J.1146.2008.01413

Received Date: 2008-11-03
Rev Recd Date: 2009-04-20
Publish Date: 2009-11-19

Abstract

Abstract

Ranging is one of the most important processes in the mobile WiMAX standard, for resolving the uplink synchronization and near/far problems. In this paper, under WiMAX OFDMA framework, two Carrier-Frequency Offset (CFO) estimation methods for multiuser case are proposed for initial ranging process. In Method 1, the CFO of each ranging user is estimated by utilizing the phase of time-domain correlation results between the ranging signal and the received signal samples. Method 2 uses the phase difference of frequency-domain correlation results between the ranging signal and two received consecutive OFDMA symbols. Simulation results show that the proposed frequency-domain correlation method performs better than the time-domain correlation method even in the case of multiple users simultaneously existing in one ranging time-slot. And it is more robust to timing offsets result from the Symbol Timing Offset (STO) estimation error.

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References(1)

References

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