Patent ID: 9215605
Filing Date: 2015-12-15
Classification: H04W

Abstract:
1. A method for estimating a frequency difference between a transmission terminal and a reception terminal according to a reception signal, comprising: in a first period, receiving and storing a first part of the reception signal; in a second period, frequency shifting the first part of the reception signal according to an L number of sweep frequencies to obtain a plurality of first part frequency-shifted signals corresponding to the L number of sweep frequencies, where L is a positive integer; performing a correlation calculation on the first part frequency-shifted signals to obtain a plurality of first part correlation results; in the second period, receiving and storing a second part of the reception signal; in a third period, frequency shifting the second part of the reception signal according to the L number of sweep frequencies to obtain a plurality of second part frequency-shifted signals corresponding to the L number of sweep frequencies; performing the correlation calculation on the second part frequency-shifted signals to obtain a plurality of second part correlation results; and estimating the frequency difference according to the first part correlation results and the second part correlation results; wherein said frequency difference is estimated according to a partial accumulation result; wherein in the third period, the step of frequency shifting the second part of the reception signal according to the L number of sweep frequencies to obtain the second part frequency-shifted signals corresponding to the L number of sweep frequencies comprises: wherein the step of estimating the frequency difference according to the first part correlation results and the second part correlation results comprises: