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The integer frequency offset and the fractional frequency offset estimation algorithms in SFN are improved and used for the Composite fractional frequency offset estimation in OFDM mixed signals in this paper。The simulation results show that the performance of the Composite frequency offset estimation is slightly lower than the single signal frequency offset estimation, but the estimation results are far less than the sub-carrier frequency interval of one percent. The simulation results also show that the composite frequency offset estimation algorithm can be used for the mixed signal frequency offset estimation.

A frequency offset estimation algorithms for OFDM mixed signals