Method and apparatus for fine frequency synchronization in WiBro system without GPS receiver

摘要

The present invention does not use that, GPS receivers on the fractional frequency synchronization acquisition method of WiBro system at a base station or a wireless repeater by measuring the spread of the received signal at the adjacent sub-carriers using the orthogonality of PN sequences, we propose a fractional frequency synchronization acquisition method for estimating the frequency offset. Fractional frequency synchronization acquisition method according to the invention, (a) step of de-spreading using a PN sequence transmitted from the transmission side with respect to adjacent sub-carriers received sequence; (B) obtaining a ratio of the correlation value obtained by the inverse diffusion; And (c) is characterized in that it comprises the step of estimating a frequency offset from the ratio of the calculated correlation value. Thus, while having a relatively low complexity without the use of a GPS receiver in a WiMAX environment, the presence of interfering signals of other base stations or repeaters can be fine frequency offset estimation.