Patent ID: 8542783

Claim:
A method for joint secondary synchronization signal detection and frame timing synchronization, comprising following steps: (1) generating two local secondary synchronization sequences, i.e. SSC 1 — n and SSC 2 — n , according to a sector number of a cell group, wherein n is an index of multiple-frame average, and at this time n=0; (2) converting received one frame time domain signal to frequency domain to obtain secondary synchronization signals S 1 and S 2 to be detected respectively corresponding to two half-frames of the one frame time domain signal; (3) carrying out inner products on said S 1 and S 2 with SSC 1 — n and SSC 2 — n respectively to obtain [S 1 ,SSC 1 — n ], [S 2 ,SSC 2 — n ], [S 1 ,SSC 2 — n ], [S 2 ,SSC 1 — n ], then combining inner product results to obtain sets [S 1 ,SSC 1 — n ]+[S 2 ,SSC 2 — n ] and [S 1 ,SSC 2 — n ]+[S 2 ,SSC 1 — n ], and letting P 1 — n =P 1 — n −1+[S 1 ,SSC 1 — n ]+[S 2 ,SSC 2 — n ], P 2 — n =P 2 — n −1+[S 1 ,SSC 2 — n ]+[S 2 ,SSC 1 — n ], wherein P 1 — −1 and P 2 — −1 are empty sets; (4) selecting a maximum value P of absolute values of correlation values in the P 1 — n and P 2 — n , and judging whether the maximum value P is greater than a preset threshold Tmax, (5) if yes, taking the index of the maximum value P as an ID number of the cell group, and completing one frame timing synchronization by judging whether the maximum value occurs in P 1 — n or P 2 — n ; if not, comparing the absolute values of the correlation values in the P 1 — n and P 2 — n with a threshold Tccv, selecting the secondary synchronization sequences corresponding to the correlation value of which the absolute value is not less than the Tccv in the P 1 — n and P 2 — n as new secondary synchronization sequences SSC 1 — n and SSC 2 — n , increasing the index by 1, and then jumping to a step of the multiple-frame average, namely carrying out step (2), and then carrying out step (3).