Improving the OFDMA Performance with Common Carrier Frequency Offset Correction

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Provided by: Science Publishing Group
Topic: Mobility
Format: PDF
In an OFDMA system, different Carrier Frequency Offsets (CFOs) are possibly raised due to the mismatch of local oscillators and the Doppler effect because of multiple-antenna channels. In spite of an initial CFO synchronization scheme able to be applied at transmitters, the compensation of residual CFOs is required at the receiver in order to eliminate the Inter-Carrier Interference (ICI) for individual subscribers, especially with an interleaved subcarrier allocation scheme. Unfortunately, conventional ICI mitigation methods cannot simultaneously remove the CFOs caused by multiple subscribers, and therefore, the Multi User Interference (MUI) remains.
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