  A new method for frequency synchronization based upon Zero-Intermediate
Frequency Zero-IF receiver and characteristics of the received signal s power
spectrum for MC-DSCDMA Up link system is proposed in this paper. In addition to
this, employing Zero Correlation Zone (ZCZ) sequences, designed specifically
for quasi synchronous up link transmissions, is proposed to exploit frequency
and temporal diversity in frequency-selective block fading channels. The
variance for Carrier Frequency Offset (CFO) estimators of MC DS CDMA Uplink is
compared with that of an OFDM system to estimate the CFO. Our study and results
show that the MC DS CDMA system is outperforming the OFDM method
