Quadrature windowed orthogonal frequency division multiplexing system, active interference cancellation method and application

The invention belongs to the technical field of wireless communication, and discloses a quadrature windowed orthogonal frequency division multiplexing system, an active interference cancellation method and application, the quadrature windowed orthogonal frequency division multiplexing system comprises a transmitter and a receiver; and the transmitter comprises a serial-to-parallel conversion module, a symbol mapping module, a subcarrier mapping module, a multi-carrier modulation module, a parallel-to-serial conversion module, a quadrature windowing module, a quadrature active spectrum leakageoffset module and an up-conversion module. According to the quadrature windowed orthogonal frequency division multiplexing system provided by the invention, an active interference cancellation technology with a variable waveform roll-off speed is applied, so that the spectrum leakage of a signal can be suppressed more effectively under the condition of not generating any inter-subcarrier interference, and the spectrum lea