Full-duplex wireless communication device, method and system

The present invention is applicable to wireless communication technology field, a kind of Full-duplex wireless communications device, method and system are provided, transmit by the output of first poliarizing antenna in the dual polarized antenna, second poliarizing antenna obtains the reception signal of the first emission subsignal that comprises useful signal and come from this first poliarizing antenna direct-coupling; This analog domain offsets module and obtains the second emission subsignal of coming from this coupling that transmits, adjust amplitude and the phase parameter of this second emission subsignal and launch subsignal to be converted to the 3rd, eliminate this first emission subsignal according to the 3rd emission subsignal, the reception signal that sampling is eliminated behind the first emission subsignal is the first digital signal, this the second emission subsignal of sampling simultaneously is the second digital signal, and exports this first digital signal and this second digital signal to this numeric field offsets module; This numeric field offsets module and eliminates this second digital signal in this first digital signal, so that interference signal is effectively reduced.