| 摘要 |
A method and system is provided for detecting the presence of a DVB (digital video broadcasting) transmission with frequency offsets. The method includes receiving an RF (radio frequency) signal in a selected channel; creating samples from the received RF signal; estimating a frequency offset of the samples; correcting the samples with the estimated frequency offset; correlating the corrected samples with a reference signal; and comparing a correlation result with a threshold value. The frequency offset estimation includes selecting a set of three or more pilots that are boosted continual pilots transmitted at fixed sub-carrier locations in all symbols; transforming the received samples to the frequency domain; determining locations of maxima in the transformed samples, the maxima corresponding to the pilots in the set; and comparing the determined locations with the expected pilot locations in the set. |
