Integrated circuit for self-interference cancellation and method of performing full-duplex radio communication

Abstract

An electronic circuit for generating a delayed radio signal for use in a radio communication device configured to provide a transmit baseband signal in a baseband, to up-convert the transmit baseband signal into a transmit radio signal in a radio band, to transmit the transmit radio signal in the radio band, and to simultaneously receive a receive radio signal in the same radio band, is provided. The electronic circuit may include an input circuit, a delay circuit, a down-converting circuit, an up-converting circuit, and an output circuit.

1 . An electronic circuit for generating a delayed radio signal for use in a radio communication device, the radio communication device configured to provide a transmit baseband signal in a baseband, to up-convert the transmit baseband signal into a transmit radio signal in a radio band, to transmit the transmit radio signal in the radio band, and to simultaneously receive a receive radio signal in the same radio band, the electronic circuit comprising:
 an input circuit configured to obtain a copy of the transmit radio signal from the radio communication device;   a delay circuit configured to delay a baseband signal that is input to the delay circuit;   an output circuit configured to output a delayed copy the transmit radio signal having a delay provided by the delay circuit.   
     
     
         2 . The electronic circuit of  claim 1 , further comprising:
 a down-converting circuit configured to shift the frequency spectrum of the copy of the transmit radio signal from the radio band to the baseband to generate the copy of the transmit baseband signal, wherein the down-converting circuit is coupled between the input circuit and the delay circuit.   
     
     
         3 . The electronic circuit of  claim 2 , wherein the delay circuit is configured to receive the copy of a transmit baseband signal from the down-converting circuit and generate the delayed copy of the transmit baseband signal. 
     
     
         4 . The electronic circuit of  claim 2 , wherein the down-converting circuit comprises at least one frequency mixer for mixing the copy of the transmit radio signal with a sinusoidal signal representing a carrier frequency corresponding to the radio band. 
     
     
         5 . The electronic circuit of  claim 3 , further comprising:
 an up-converting circuit configured to the shift a frequency spectrum of the copy of delayed baseband signal to a radio band to generate a delayed copy of the radio signal, wherein the up-converting circuit is coupled between the delay circuit and the output circuit.   
     
     
         6 . The electronic circuit of  claim 5 , wherein the up-converting circuit is configured to provide the copy of delayed radio signal to the output circuit. 
     
     
         7 . The electronic circuit of  claim 5 , wherein the up-converting circuit comprises at least one frequency mixer for mixing the delayed baseband signal with a sinusoidal signal representing a carrier frequency corresponding to the radio band. 
     
     
         8 . The electronic circuit of  claim 3 , wherein the delay circuit is configured to delay the copy of the transmit baseband signal by a variable amount of time to generate the delayed baseband signal. 
     
     
         9 . The electronic circuit of  claim 1 , wherein the output circuit is configured to output the delayed copy the transmit radio signal to a cancellation circuit. 
     
     
         10 . The electronic circuit of  claim 1 , further comprising at least one weighting circuit for weighting the delayed copy of the transmit baseband signal. 
     
     
         11 . The electronic circuit of  claim 1 , wherein at least the input circuit, the delay circuit and the output circuit comprise passive components. 
     
     
         12 . The electronic circuit of  claim 1 , wherein the electronic circuit is integrated on a semiconductor chip. 
     
     
         13 . A method of generating a delayed radio signal for use in a radio communication device configured to provide a transmit baseband signal in a baseband, to up-convert the transmit baseband signal into a transmit radio signal in a radio band, to transmit the transmit radio signal in the radio band, and to simultaneously receive a receive radio signal in the same radio band, the method comprising:
 receiving a copy of the transmit radio signal from the radio communication device;   down-converting the frequency spectrum of the copy of the transmit radio signal from the radio band to the baseband to generate the copy of the transmit baseband signal;   delaying a copy of the transmit baseband signal by an amount of time to generate a delayed baseband signal, up-converting the frequency spectrum of the delayed baseband signal to the radio band to generate a delayed radio signal;   up-converting the frequency spectrum of the delayed baseband signal to the radio band to generate a delayed radio signal; and   outputting the delayed radio signal for canceling the delayed radio signal from the receive radio signal.   
     
     
         14 . The method of  claim 13 , wherein delaying the copy of the transmit baseband signal comprises delaying the copy of the transmit baseband signal by a variable amount of time to generate the delayed baseband signal. 
     
     
         15 . The method of  claim 13 , delaying a copy of the transmit baseband signal comprises low-pass filtering the copy of the transmit baseband signal. 
     
     
         16 . The method of  claim 13 , wherein up-converting the delayed baseband signal comprises mixing the delayed baseband signal with a sinusoidal signal representing a carrier frequency corresponding to the radio band. 
     
     
         17 . The method of  claim 13 , wherein down-converting the copy of the transmit radio signal comprises mixing the copy of the transmit radio signal with a sinusoidal signal representing a carrier frequency corresponding to the radio band. 
     
     
         18 . An electronic circuit for generating a delayed radio signal for use in a radio communication device, the radio communication device configured to provide a transmit baseband signal in a baseband, to up-convert the transmit baseband signal into a transmit radio signal in a radio band, to transmit the transmit radio signal in the radio band, and to simultaneously receive a receive radio signal in the same radio band, the electronic circuit comprising:
 an input circuit configured to obtain a copy of the transmit radio signal from the radio communication device;   a delay circuit configured to delay a baseband signal that is input to the delay circuit; and   an output circuit configured to output a delayed copy the transmit radio signal having a delay provided by the delay circuit.   
     
     
         19 . The electronic circuit of  claim 19 , further comprising:
 a down-converting circuit configured to shift the frequency spectrum of the copy of the transmit radio signal from the radio band to the baseband to generate the copy of the transmit baseband signal, wherein the down-converting circuit is coupled between the input circuit and the delay circuit.   
     
     
         20 . The electronic circuit of  claim 19 , wherein the delay circuit is configured to receive the copy of a transmit baseband signal from the down-converting circuit and generate the delayed copy of the transmit baseband signal.