Downlink synchronization method and apparatus

The invention discloses a downlink synchronization method, which comprises: segmenting received data with a frame length plus 64chips; performing relevance on 128chips data of each section and 32 local SYNC DL respectively to find out the maximum relevant vale and the corresponding position of each SYNC DL in the section of data; performing power normalization on the maximum relevant value of each SYNC DL on a first section by utilizing all data of the section; saving the normalized power value and the corresponding position through a word memory respectively; calculating the normalized power value obtained by the maximum relevant value of each SYNC DL on other sections by using all data of the corresponding sections time by time; replacing the maximum relevant value to the corresponding word memory; and determining synchronization result according to the times after repeating the sub-frame length achieving the preset number. The invention also discloses an embodiment of other methods and an embodiment of a d