  In this paper synchronization techniques using cyclic prefix (CP) are
analyzed to remove the influence of symbol time offset (STO) for correct
synchronization in Orthogonal Frequency Division Multiplex (OFDM) system. For
correct detection of STO using CP two techniques are used. The first one is
based on finding the maximum correlation between two blocks and the second one
on finding the similarity between two blocks which is maximized when the
difference between them is minimized. Two cases are observed. The first one
uses only additive white Gaussian noise (AWGN), while the second also uses the
channel impulse response (CIR) of Rayleigh channel. When channel effect is
added both performances of estimation by correlation and difference deteriorate
if sufficient level of signal to noise (SNR) and proper length of CP are not
provided.
