A blind uplink OFDM synchronization algorithm based on cyclostationarity

A blind uplink synchronization algorithm of multiuser OFDM system is introduced in this article. The algorithm exploits the second-order cyclostationarity of the received signal, to estimate the carrier frequency offset and symbol time delay of every user. And a modified frequency offset estimation algorithm based on second-order conjugate cyclostationarity is proposed too. The characteristic of high resolution and immune to the effects of noise and interference can be achieved. Finally, the simulation results show the performance of estimators as the function of SNR and record length, and also compare with other algorithm.