Analog signal path modeling for self-interference cancellation

• US 8,023,438 B2
• Filed: 11/06/2007
• Issued: 09/20/2011
• Est. Priority Date: 11/06/2006
• Status: Active Grant

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Nokia Corporation
• Inventors: Parts, Ulo, Haapoja, Sami, Kangasmaa, Seppo
• Primary Examiner(s): Pezzlo, John
• Application Number:
  US11/982,991
• Publication Number:
  US 20080107046A1
• Time in Patent Office: 1,414 Days
• Field of Search: 370286-292, 370/252, 370/419
• US Class Current: 370/286
• CPC Class Codes: H04B 1/12 Neutralising, balancing, or compensation arrangements
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver

Abstract

Described herein is a device that includes at least one radio frequency transmitter; at least one radio frequency receiver; a copy block configurable to output a digital representation of a currently transmitted signal and a model having a representation of at least analog circuitry of the at least one radio frequency transmitter and analog circuitry of the at least one radio frequency receiver, as well as possibly one or more antennas. The model generates, in response to the digital representation of the currently transmitted signal, a self-interference compensation signal to compensate, in the digital domain, a signal that is received simultaneously with the currently transmitted signal. Also described are corresponding apparatus, methods, computer program instructions stored in a memory medium, and an integrated circuit embodiment.

Claims

1. A method, comprising:

operating a processor to apply a digital representation of a currently transmitted signal to a model to generate a self-interference compensation signal, the model comprising a representation of at least analog circuitry of a transmitter and analog circuitry of a receiver; and

operating the processor to compensate in the digital domain a signal that is received simultaneously with the currently transmitted signal using the generated self-interference compensation signal.

2. The method of claim 1, where the model also comprises a representation of at least one antenna, signal impairments, including at least one of power supply noise, clock signal noise, coupling between signal lines, and antenna coupling.

3. The method of claim 1, where the model is controlled in accordance with current operating characteristics, including at least one of transmit timing relative to receive timing and transmitter power level.

4. The method of claim 1, performed in a single system communication device, where the model represents full duplex operation of the transmitter and the receiver in the single system.

5. The method of claim 1, performed in a multi-system communication device, where the model represents simultaneous operation of at least the transmitter in a first system and the receiver in a second system.

6. The method of claim 1, where at least some of the analog circuitry of the transmitter and at least some of the analog circuitry of the receiver are contained within an integrated circuit, and where the model also comprises a representation of integrated circuit effects on the received signal.

7. The method of claim 6, where the integrated circuit also contains at least some transmitter baseband circuitry and at least some receiver baseband circuitry.

8. The method of claim 1, further comprising calibrating the model prior to applying the digital representation of the currently transmitted signal to the model.

9. A non-transitory computer readable data storage medium storing a program of computer-executable instructions, where execution of the instructions by a processor results in operations comprising:

applying a digital representation of a currently transmitted signal to a model to generate a self-interference compensation signal, the model comprising a representation of at least analog circuitry of a transmitter and analog circuitry of a receiver; and

compensating in the digital domain a signal that is received simultaneously with the currently transmitted signal using the generated self-interference compensation signal.

10. The data storage medium of claim 9, where the model also comprises a representation of at least one antenna and signal impairments, including at least one of power supply noise, clock signal noise, coupling between signal lines and antenna coupling effects, where at least some of the analog circuitry of the transmitter and at least some of the analog circuitry of the receiver are contained within an integrated circuit, and where the model also comprises a representation of integrated circuit effects on the received signal.

11. The data storage medium of claim 9, where the model is controlled in accordance with current operating characteristics, including at least one of transmit timing relative to receive timing and transmitter power level.

12. The data storage medium of claim 9, embodied in one of a single system communication device, where the model represents full duplex operation of the transmitter and the receiver in the single system, or in a multi-system communication device, where the model represents simultaneous operation of at least the transmitter in a first system and the receiver in a second system.

13. The data storage medium of claim 9, further comprising an operation of calibrating the model prior to the operation of applying the digital representation of the currently transmitted signal to the model.

14. An apparatus, comprising:

at least one radio frequency transmitter;

at least one radio frequency receiver;

a copy block configurable to output a digital representation of a currently transmitted signal; and

a model comprising a representation of at least analog circuitry of the at least one radio frequency transmitter and analog circuitry of the at least one radio frequency receiver, said model generating in response to the digital representation of the currently transmitted signal a self-interference compensation signal to compensate in the digital domain a signal that is received simultaneously with the currently transmitted signal.

15. The apparatus of claim 14, where the model also comprises a representation of at least one antenna, signal impairments, including at least one of power supply noise, clock signal noise, coupling between signal lines, and antenna coupling.

16. The apparatus of claim 14, further comprising a controller configurable to control the model in accordance with current operating characteristics of the device, including at least one of transmit timing relative to receive timing and transmitter power level.

17. The apparatus of claim 14, embodied as a single system communication device, and where the model represents full duplex operation of the transmitter and the receiver in the single system, including a presence of at least one antenna.

18. The apparatus of claim 14, embodied as a multi-system communication device, and where the model represents simultaneous operation of at least the transmitter in a first system and the receiver in a second system, including a presence of at least one antenna.

19. The apparatus of claim 14, where at least some of the analog circuitry of the transmitter and at least some of the analog circuitry of the receiver are contained within an integrated circuit, and where the model also comprises a representation of integrated circuit effects on the received signal.

20. The apparatus of claim 19, where the integrated circuit also contains at least some transmitter baseband circuitry and at least some receiver baseband circuitry.

21. The apparatus of claim 14, further comprising a controller configurable to calibrate the model.

22. The apparatus of claim 14, further comprising control means for calibrating and controlling operation of the modeling means.

23. An integrated circuit, comprising:

at least a portion of at least one radio frequency transmitter;

at least a portion of at least one radio frequency receiver;

a copy block configurable to output a digital representation of a currently transmitted signal; and

a controller configurable to operate a model in accordance with current operating characteristics, the model comprising a representation of at least analog circuitry of the at least one radio frequency transmitter and analog circuitry of the at least one radio frequency receiver, said model generating in response to the digital representation of the currently transmitted signal a self-interference compensation signal to compensate in the digital domain a signal that is received simultaneously with the currently transmitted signal.

24. The integrated circuit of claim 23, where the model also comprises a representation of at least one antenna, signal impairments, including at least one of power supply noise, clock signal noise, coupling between signal lines, antenna coupling, and an effect of the integrated circuit on the received signal.

25. The integrated circuit of claim 23, where the current operating characteristics comprise at least one of transmit timing relative to receive timing and transmitter power level.

26. The integrated circuit of claim 23, embodied in a single system communication apparatus, where the model represents full duplex operation of the transmitter and the receiver in the single system.

27. The integrated circuit of claim 23, embodied in a multi-system communication apparatus, where the model represents simultaneous operation of at least the transmitter in a first system and the receiver in a second system.

28. The integrated circuit of claim 23, where the model also comprises a representation of integrated circuit internal coupling mechanisms and their effect on the received signal.

29. The integrated circuit of claim 23, where the integrated circuit further comprises at least one of transmitter baseband circuitry and receiver baseband circuitry.

30. The integrated circuit of claim 23, where the controller is further configurable to calibrate the model.

31. An apparatus, comprising:

means for transmitting at least one radio frequency signal;

means for receiving at least one radio frequency signal;

means for outputting a digital representation of a currently transmitted radio frequency signal; and

means for modeling a representation of at least analog circuitry of the transmitting means and analog circuitry of the receiving means, said modeling means generating in response to the digital representation of the currently transmitted signal a self-interference compensation signal for compensating in the digital domain a radio frequency signal that is received simultaneously with the currently transmitted radio frequency signal.

32. The apparatus of claim 31, where said modeling means also comprises a representation of at least one antenna, signal impairments, including at least one of power supply noise, clock signal noise, coupling between signal lines, and antenna coupling.

33. The apparatus of claim 31, further comprising means for controlling the modeling means in accordance with current operating characteristics, including at least one of transmit timing relative to receive timing and transmitter means power level.

34. The apparatus of claim 31, embodied in one of a single system communication apparatus, where the modeling means represents full duplex operation of the transmitter means and the receiver means, including a presence of at least one antenna, or in a multi-system communication apparatus, where the modeling means represents simultaneous operation of at least the transmitter means in a first system and the receiver means in a second system, including a presence of at least one antenna.

35. The apparatus of claim 31, where at least some of the analog circuitry of the transmitter means and at least some of the analog circuitry of the receiver means are contained within an integrated circuit, and where the modeling means also comprises a representation of an effect of the integrated circuit on the received signal, and where the integrated circuit also contains at least some baseband circuitry.