the despreading application_number US 86498401 A description fig1 and 2 have been described in the previous parts of the specification fig3 illustrates a flow diagram of a receiving method according to a first embodiment of the invention where frequency offset correction is performed with a feedback signal a received rf signal is first downconverted to the baseband by mixing with a local oscillator lo signal 304 and then converted to digital samples forming a digital baseband signal 306 if the frequency offset correction is performed to the wideband signal the signal is then multiplied with a complex phasor in step 350 the signal is further despread to form a narrowband signal 310 the despreading is performed with a long code successively with a long code and a short code if the frequency offset correction is performed to the narrowband signal then the signal after despreading with a long code is multiplied with the complex phasor in step 351 and the signal which is despread with both the long code and the short code is multiplied with the complex phasor in step 352 a channel estimate is formed based on the signal which is despread with the long code using the pilot 314 the channel estimation data is.