Patent ID: 8576752

Claim:
A single channel full duplex wireless communication system, comprising: a processor; a transmitter coupled to the processor, the transmitter transmitting a transmission signal via a transmission path; a receiver coupled to the processor, the receiver receiving a received signal via a reception path, wherein the transmitter and the receiver utilize one channel, at the same time, to transmit and receive said transmission and received signals with no separation between frequencies used for the transmitting and the receiving, wherein a portion of the transmission signal is leaked, said leakage causing self-interference in the received signal; a secondary transmission path coupled to the processor; and the processor estimating a first transfer function, wherein the first transfer function has an input comprising the transmission signal fed to the input of the transmission path, and an output comprising the input adjusted by the first transfer function in such a way so as to reduce the self-interference in the received signal, and feeding the input of the secondary transmission path with the output from the first transfer function; a combining element connected to the input of the receiver and to the output of the secondary transmission path, to combine the received signal with the output from the secondary transmission path, thereby removing at least a fraction of the self-interference; and a transmission feedback path and a secondary transmission feedback path, wherein the input to the transmission feedback path is connected to the output of the transmission path, and the input to the secondary transmission feedback path is connected to the output of the secondary transmission path, the transmission feedback path output being modified by a second transfer function and the secondary transmission feedback path output being modified by a third transfer function, such that combining of the modified transmission feedback path output and the modified secondary transmission feedback path output with the reception path output reduces the remaining fraction of the self-interference.