Patent ID: 9107158
Filing Date: 2015-08-11
Classification: H04J,H04W

Abstract:
1. A robust downlink timing synchronization method in a LTE system, comprising the following steps: step 1: a receiving terminal continuously storing time domain signal sequences of M PSS transmission periods, wherein M is a number of the 5 ms periods to be superposed, and M≧1, PSS means primary synchronization signal; step 2: performing narrowband filtering on the time domain signal sequences of the M PSS transmission periods; step 3: performing down-sampling on data obtained after the filtering; step 4: performing sliding differential mirror correlation on the down-sampling data of an m step 5: superposing a group of correlation values Ri(m) of each PSS transmission period obtained from the step 4 to obtain and step 6: determining by the receiving terminal whether the superposition result R(i) obtained from the step 5 has an obvious peak interval; if yes, completing capturing the PSS, and obtaining timing information according to a position of a maximum correlation peak for reducing influence of initial frequency offset and ensuring timing synchronization in a low signal-to-noise ratio interval; otherwise, returning to step 1.