1. A method for estimating a first wireless communication channel (FWCC) transmitting data from a first antenna system (FAS) to a second antenna system (SAS) in a telecommunication system, the telecommunication system having a second wireless communication channel (SWCC) for transmitting data from the SAS to FAS, the method comprising: analyzing one or more characteristics of the SWCC (SWCC Characteristics) based on a data stream received by FAS from the SAS; extracting an initial condition of the FWCC from the data received; and predicting one or more characteristics of the FWCC (FWCC Characteristics) based on the analyzed SWCC Characteristics and the extracted initial condition of the FWCC.