Full duplex system with self-interference cancellation
First Claim
1. An apparatus, comprising:
- receiving circuitry configured to form a signal receiving path arranged for transferring communication signals received via air interface;
transmitting circuitry configured to form a signal transmission path arranged for transferring communication signals to be transmitted via air interface; and
interference cancellation circuitry in operable connection between the signal receiving path and the signal transmission path,wherein the receiving circuitry and the transmitting circuitry are configured to receive and transmit communication signals at the same time and at the same frequency,wherein the interference cancellation circuitry is configured to provide an isolation range between the signal receiving path and the signal transmission path that includes the center of a communication band for the signals received and/or to be transmitted via air interface, the interference cancellation circuitry comprising a first interference cancellation stage which comprises a first circuit design or a second circuit design, wherein the first circuit design comprises a first parallel branch having an inductance element and a second parallel branch having a capacitance element, and the second circuit design comprises a first parallel branch having an inductance element, a second parallel branch having a capacitance element, and a third parallel branch having a resistance element, the interference cancellation circuitry additionally comprising a second interference cancellation stage and a third interference cancellation stage both comprising the second circuit design that is arranged in serial connection with the first interference cancellation stage.
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Accused Products
Abstract
An apparatus and method enable a full duplex system with self-interference cancellation. Receiving circuitry forming a signal receiving path is arranged for transferring communication signals received via air interface. Transmitting circuitry forming a signal transmission path is arranged for transferring communication signals to be transmitted via air interface. Interference cancellation circuitry is in operable connection between the signal receiving path and the signal transmission path. The receiving circuitry and the transmitting circuitry are arranged to receive and transmit communication signals at the same time and at the same frequency. The interference cancellation circuitry comprises resistance, inductance and capacitance arranged to constitute a center frequency of an isolation range between the signal receiving path and the signal transmission path which substantially falls into the center of a communication band for the signals received and/or to be transmitted via air interface.
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Citations
20 Claims
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1. An apparatus, comprising:
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receiving circuitry configured to form a signal receiving path arranged for transferring communication signals received via air interface; transmitting circuitry configured to form a signal transmission path arranged for transferring communication signals to be transmitted via air interface; and interference cancellation circuitry in operable connection between the signal receiving path and the signal transmission path, wherein the receiving circuitry and the transmitting circuitry are configured to receive and transmit communication signals at the same time and at the same frequency, wherein the interference cancellation circuitry is configured to provide an isolation range between the signal receiving path and the signal transmission path that includes the center of a communication band for the signals received and/or to be transmitted via air interface, the interference cancellation circuitry comprising a first interference cancellation stage which comprises a first circuit design or a second circuit design, wherein the first circuit design comprises a first parallel branch having an inductance element and a second parallel branch having a capacitance element, and the second circuit design comprises a first parallel branch having an inductance element, a second parallel branch having a capacitance element, and a third parallel branch having a resistance element, the interference cancellation circuitry additionally comprising a second interference cancellation stage and a third interference cancellation stage both comprising the second circuit design that is arranged in serial connection with the first interference cancellation stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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receiving communication signals by a receiving circuitry via air interface and transferring the same in a signal receiving path; transmitting communication signals by a transmitting circuitry via air interface and transferring the same in a signal transmission path, wherein the communication signals are received and transmitted at the same time and at the same frequency; and cancelling interference between the signal receiving path and the signal transmission path by interference cancellation circuitry connected there between, which is configured to provide an isolation range between the signal receiving path and the signal transmission path that includes the center of a communication band for the signals received and/or transmitted via air interface, the interference cancellation circuitry comprising a first interference cancellation stage which comprises a first circuit design or a second circuit design, wherein the first circuit design comprises a first parallel branch having an inductance element and a second parallel branch having a capacitance element, and the second circuit design comprises a first parallel branch having an inductance element, a second parallel branch having a capacitance element, and a third parallel branch having a resistance element, the interference cancellation circuitry additionally comprising a second interference cancellation stage and a third interference cancellation stage both comprising the second circuit design that is arranged in serial connection with the first interference cancellation stage. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification