Full-duplex radio communication device, method and system

A full-duplex radio communication device, comprising:

• a dual-polarized antenna;
• an analog domain cancellation module;
• and
• a digital domain cancellation module,
• wherein a first polarized antenna in the dual-polarized antenna is configured to output a transmitted signal, a second polarized antenna in the dual-polarized antenna is configured to acquire a received signal, and the received signal comprises a wanted signal and a first transmitted sub-signal that is directly coupled from the first polarized antenna through an air interface,
• wherein the analog domain cancellation module is configured to acquire a second transmitted sub-signal coupled by the transmitted signal output from the first polarized antenna, adjust an amplitude and a phase parameter of the second transmitted sub-signal to convert the second transmitted sub-signal into a third transmitted sub-signal, eliminate, according to the third transmitted sub-signal, the first transmitted sub-signal in the received signal acquired by the second polarized antenna, sample the received signal, from which the first transmitted sub-signal is eliminated, as a first digital signal, and output the first digital signal to the digital domain cancellation module, sample the second transmitted sub-signal as a second digital signal at the same time, and output the second digital signal to the digital domain cancellation module, and
• wherein the digital domain cancellation module is configured to eliminate the second digital signal in the first digital signal, and output the first digital signal from which the second digital signal is eliminated.