A communication device (111, 112, 302), comprising: a transmitter configured to transmit a first signal and a projected signal; and a circuit configured to: determine an estimated signal state information that corresponds to a linear transfer function associated with a transmission path between the communication device (111, 112, 302) and a first communication device; determine the projected signal based on the estimated signal state information such that an estimated energy of a shaped projected signal is smaller than an estimated energy of a shaped signal, wherein the estimated signal state information is an estimate of a signal state information for a transmission path between the communication device (111, 112, 302) and an incumbent base station (107, 108), and is determined based on the first signal and a received signal that is received by a receiver of the first communication device and corresponds to the first signal transmitted by the transmitter of the communication device (111, 112, 302), wherein the shaped projected signal is the projected signal received by a receiver of the incumbent base station (107, 108) and filtered by a filter of the incumbent base station (107, 108), wherein the shaped signal is the first signal received by the receiver of the incumbent base station (107, 108) and filtered by the filter of the incumbent base station (107, 108); wherein the circuit is configured to select the first communication device from a plurality of communication devices (210, 214, 218) such that a distance of the first communication device from the incumbent base station (107, 108) is a smallest distance from distances of communication devices (210, 214, 218) of the plurality of communication devices (210, 214, 218) from the incumbent base station (107, 108). a transmitter configured to transmit a first signal and a projected signal; and a circuit configured to: determine an estimated signal state information that corresponds to a linear transfer function associated with a transmission path between the communication device (111, 112, 302) and a first communication device; determine the projected signal based on the estimated signal state information such that an estimated energy of a shaped projected signal is smaller than an estimated energy of a shaped signal, wherein the estimated signal state information is an estimate of a signal state information for a transmission path between the communication device (111, 112, 302) and an incumbent base station (107, 108), and is determined based on the first signal and a received signal that is received by a receiver of the first communication device and corresponds to the first signal transmitted by the transmitter of the communication device (111, 112, 302), wherein the shaped projected signal is the projected signal received by a receiver of the incumbent base station (107, 108) and filtered by a filter of the incumbent base station (107, 108), determine an estimated signal state information that corresponds to a linear transfer function associated with a transmission path between the communication device (111, 112, 302) and a first communication device; determine the projected signal based on the estimated signal state information such that an estimated energy of a shaped projected signal is smaller than an estimated energy of a shaped signal, wherein the estimated signal state information is an estimate of a signal state information for a transmission path between the communication device (111, 112, 302) and an incumbent base station (107, 108), and is determined based on the first signal and a received signal that is received by a receiver of the first communication device and corresponds to the first signal transmitted by the transmitter of the communication device (111, 112, 302), wherein the shaped projected signal is the projected signal received by a receiver of the incumbent base station (107, 108) and filtered by a filter of the incumbent base station (107, 108), wherein the shaped signal is the first signal received by the receiver of the incumbent base station (107, 108) and filtered by the filter of the incumbent base station (107, 108); wherein the circuit is configured to select the first communication device from a plurality of communication devices (210, 214, 218) such that a distance of the first communication device from the incumbent base station (107, 108) is a smallest distance from distances of communication devices (210, 214, 218) of the plurality of communication devices (210, 214, 218) from the incumbent base station (107, 108).