the interference between the common reference signal and the data signal fig4 is a flowchart of a channel estimation method provided in the third embodiment of the present disclosure on the basis of the first embodiment step 102 may include the following steps step 1021 regard data signals in the downlink signals as interference signals and perform channel estimation the data signals may be regarded as interference signals to perform channel estimation step 1022 estimate the data signals according to the result of channel estimation step 1023 eliminate the data signals in the downlink signals according to the result of estimating the data signals and perform channel estimation specifically subtract estimated data signals from the downlink signals eliminate the interference caused by the data signals and estimate the channel again steps 1021 1023 are an iterative process to better eliminate the impact caused by the data signals the foregoing steps may be repeated the fourth embodiment of a channel estimation method is described below the processing method in this embodiment is the same as that in the first embodiment above specifically the reference signal is a dedicated reference signal in the same way as obtaining the dedicated reference signal in the second embodiment above this embodiment can obtain the dedicated reference signal whose relative frequency shift is zero this embodiment differs in that no common reference signal is included in the data channel symbol domains except the preset symbol domain in the downlink signals so that the interference between the common reference signal and the data signal can be eliminated fig5 a and fig5 b show reference.