COMBINED ESTIMATION METHOD FOR TIME DEVIATION AND FREQUENCY DEVIATION

摘要

The present invention relates to the field of wireless communications, and particularly to a combined estimation method for time deviation and frequency deviation in a 3rd generation mobile communication long term evolution system (abbreviated as 3G LTE hereinafter). The difference lies in the following steps: A. separating the channel gain estimation values of the PUSCH demodulation reference signals (DMRS) of two timeslots from the received subframe data; B. calculating a cross-correlation value of the channel gains between two subcarriers on different PUSCH demodulation reference signals (DMRS) the frequency domain distance between which is s subcarrier spaces so as to obtain a combined estimation phase difference of time deviation and frequency deviation; and C. respectively obtaining a time deviation phase deviation and a frequency deviation phase deviation according to the combined estimation phase difference of time deviation and frequency deviation, and then estimating a system time deviation value and frequency deviation value. The present invention can reduce the calculation amount of an estimation algorithm under the premise of ensuring estimation accuracy, thus ensuring the real-time receiving performance of the system.