Patent ID: 8837614
Filing Date: 2014-09-16
Classification: H04L

Abstract:
1. A pilot-based timing offset estimation apparatus, comprising: a pilot bit channel estimation module, configured to acquire pilot bit frequency-domain channel estimation values of target users through calculation on respective sub-carriers of the target users according to received frequency-domain demodulation reference symbols and local frequency-domain demodulation reference symbols; and a timing offset estimation module, configured to respectively perform timing offset estimation for each target user by using phase differences among the pilot bit frequency-domain channel estimation values on the respective sub-carriers; wherein the timing offset estimation module calculates timing offset estimation values at respective pilot positions on respective receiving antennae by using the phase differences among the acquired pilot bit frequency-domain channel estimation values; wherein the timing offset estimation module averages a plurality of the timing offset estimation values at the pilot positions on the receiving antennae acquired through calculation; wherein the timing offset estimation module calculates the timing offset estimation value t where M is a length of a frequency-domain channel estimation value; N is the number of points of a Fast Fourier Transform (FFT); S is a carrier spacing factor which is an integer less than M-S, and when a cell configuration is a normal cyclic prefix, S is selected to be a first value by default, and when a cell configuration is an extended cyclic prefix, S is selected to be a second value by default; “angle ( )” is an angle function; “conj( )” is a conjugate function; H