A device includes a transmitting unit configured to transmit a first allocation signal synthesized by use of the superimposed coding to plenty of user equipment at least including a first and a second user equipment, and the first allocation signal at least including a first power signal part for the first user equipment and a second power signal part for the second user equipment; a receiving unit that receives at least a feedback retransmission request from the first and the second user equipment; and a processing unit that processes the first and the second power signal parts with a preset processing coefficient to obtain a second allocation signal in response to the retransmission request.