Patent ID: 6775318
Filing Date: 2004-08-10
Classification: H04B,H04W

Abstract:
A method for code group identification and frame synchronization, comprising the following steps:providing secondary synchronization code sequences SSCS1, SSCS2, . . . , SSCSK with length of L codes, secondary synchronization code sequences SSCS1, SSCS 2, . . . , SSCSK corresponding to code groups GCS1, GCS2, . . . , GCSk and constructed of CS1, CS2, . . , CSN; providing K theoretical frequency sequences with length of N elements, each theoretical frequency sequence representing the theoretical-occurrence times of CS1, CS2, . . . , CSN in a corresponding secondary synchronization code sequence, wherein K, L, and N are integers; sensing and recording, consecutively, secondary synchronization codes from a base station to form a received code sequence with length of L codes, each code in the received code sequence being selected from CS1, CS2, . . . , CSN; counting the occurrence times of CS1, CS2, . . . , CSN in the received code sequence to form a testing sequence with length of N elements; comparing, one-by-one, the testing sequence with the K theoretical frequency sequences to retrieve a candidate code group, wherein the theoretical frequency sequence corresponding to the candidate code group is most similar to the testing sequence, the candidate code group corresponding to a candidate secondary synchronization code sequence; comparing the received code sequence with all possible sequences generated by cycle-shifting the candidate secondary synchronization code sequence to retrieve a most-likely code sequence which is most similar to the received code sequence; and determining a code group and a frame boundary according to the most-likely sequence.